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FAILED: patch "[PATCH] scsi: ufs: Re-enable WriteBooster after device reset" failed to apply to 5.10-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 5.10-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From bd14bf0e4a084514aa62d24d2109e0f09a93822f Mon Sep 17 00:00:00 2001 From: Stanley Chu <stanley.chu(a)mediatek.com> Date: Tue, 8 Dec 2020 21:56:34 +0800 Subject: [PATCH] scsi: ufs: Re-enable WriteBooster after device reset UFS 3.1 specification mentions that the WriteBooster flags listed below will be set to their default values, i.e. disabled, after power cycle or any type of reset event. Thus we need to reset the flag variables kept in struct hba to align with the device status and ensure that WriteBooster-related functions are configured properly after device reset. Without this fix, WriteBooster will not be enabled successfully after by ufshcd_wb_ctrl() after device reset because hba->wb_enabled remains true. Flags required to be reset to default values: - fWriteBoosterEn: hba->wb_enabled - fWriteBoosterBufferFlushEn: hba->wb_buf_flush_enabled - fWriteBoosterBufferFlushDuringHibernate: No variable mapped Link: https://lore.kernel.org/r/20201208135635.15326-2-stanley.chu@mediatek.com Fixes: 3d17b9b5ab11 ("scsi: ufs: Add write booster feature support") Reviewed-by: Bean Huo <beanhuo(a)micron.com> Signed-off-by: Stanley Chu <stanley.chu(a)mediatek.com> Signed-off-by: Martin K. Petersen <martin.petersen(a)oracle.com> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index 08c8a591e6b0..36d367eb8139 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -1221,8 +1221,13 @@ static inline void ufshcd_vops_device_reset(struct ufs_hba *hba) if (hba->vops && hba->vops->device_reset) { int err = hba->vops->device_reset(hba); - if (!err) + if (!err) { ufshcd_set_ufs_dev_active(hba); + if (ufshcd_is_wb_allowed(hba)) { + hba->wb_enabled = false; + hba->wb_buf_flush_enabled = false; + } + } if (err != -EOPNOTSUPP) ufshcd_update_evt_hist(hba, UFS_EVT_DEV_RESET, err); }

4 years, 8 months

1
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[PATCH 00/10] Cover letter: fix a race in release_task when flushing the dentry

by Wen Yang

The dentries such as /proc/<pid>/ns/ have the DCACHE_OP_DELETE flag, they should be deleted when the process exits. Suppose the following race appears： release_task dput -> proc_flush_task -> dentry->d_op->d_delete(dentry) -> __exit_signal -> dentry->d_lockref.count-- and return. In the proc_flush_task(), if another process is using this dentry, it will not be deleted. At the same time, in dput(), d_op->d_delete() can be executed before __exit_signal(pid has not been hashed), d_delete returns false, so this dentry still cannot be deleted. This dentry will always be cached (although its count is 0 and the DCACHE_OP_DELETE flag is set), its parent denry will also be cached too, and these dentries can only be deleted when drop_caches is manually triggered. This will result in wasted memory. What's more troublesome is that these dentries reference pid, according to the commit f333c700c610 ("pidns: Add a limit on the number of pid namespaces"), if the pid cannot be released, it may result in the inability to create a new pid_ns. This problem occurred in our cluster environment (Linux 4.9 LTS). We could reproduce it by manually constructing a test program + adding some debugging switches in the kernel: * A test program to open the directory (/proc/<pid>/ns) [1] * Adding some debugging switches to the kernel, adding a delay between proc_flush_task and __exit_signal in release_task() [2] The test process is as follows: A, terminal #1 Turn on the debug switch: echo 1> /proc/sys/vm/dentry_debug_trace Execute the following unshare command: sudo unshare --pid --fork --mount-proc bash B, terminal #2 Find the pid of the unshare process: # pstree -p | grep unshare | `-sshd(716)---bash(718)--sudo(816)---unshare(817)---bash(818) Find the corresponding dentry: # dmesg | grep pid=818 [70.424722] XXX proc_pid_instantiate:3119 pid=818 tid=818 entry=818/ffff8802c7b670e8 C, terminal #3 Execute the opendir program, it will always open the /proc/818/ns/ directory: # ./a.out /proc/818/ns/ pid: 876 . .. net uts ipc pid user mnt cgroup D, go back to terminal #2 Turn on the debugging switches to construct the race: # echo 818> /proc/sys/vm/dentry_debug_pid # echo 1> /proc/sys/vm/dentry_debug_delay Kill the unshare process (pid 818). Since the debugging switches have been turned on, it will get stuck in release_task(): # kill -9 818 Then kill the process that opened the /proc/818/ns/ directory: # kill -9 876 Then turn off these debugging switches to allow the 818 process to exit: # echo 0> /proc/sys/vm/dentry_debug_delay # echo 0> /proc/sys/vm/dentry_debug_pid Checking the dmesg, we will find that the dentry(/proc/818/ns) ’s count is 0, and the flag is 2800cc (#define DCACHE_OP_DELETE 0x00000008), but it is still cached: # dmesg | grep ffff8802a3999548 … [565.559156] XXX dput:853 dentry=ns/ffff8802bea7b528, flag=2800cc, cnt=0, inode=ffff8802b38c2010, pdentry=818/ffff8802c7b670e8, pflag=20008c, pcnt=1, pinode=ffff8802c7812010, keywords: be cached It could also be verified via the crash tool: crash> dentry.d_flags,d_iname,d_inode,d_lockref -x ffff8802bea7b528 d_flags = 0x2800cc d_iname = "ns\000kkkkkkkkkkkkkkkkkkkkkkkkkkkk" d_inode = 0xffff8802b38c2010 d_lockref = { { lock_count = 0x0, { lock = { { rlock = { raw_lock = { { val = { counter = 0x0 }, { locked = 0x0, pending = 0x0 }, { locked_pending = 0x0, tail = 0x0 } } } } } }, count = 0x0 } } } crash> kmem ffff8802bea7b528 CACHE OBJSIZE ALLOCATED TOTAL SLABS SSIZE NAME ffff8802dd5f5900 192 23663 26130 871 16k dentry SLAB MEMORY NODE TOTAL ALLOCATED FREE ffffea000afa9e00 ffff8802bea78000 0 30 25 5 FREE / [ALLOCATED] [ffff8802bea7b520] PAGE PHYSICAL MAPPING INDEX CNT FLAGS ffffea000afa9ec0 2bea7b000 dead000000000400 0 0 2fffff80000000 crash> This series of patches is to fix this issue. Regards, Wen Alexey Dobriyan (1): proc: use %u for pid printing and slightly less stack Andreas Gruenbacher (1): proc: Pass file mode to proc_pid_make_inode Christian Brauner (1): clone: add CLONE_PIDFD Eric W. Biederman (6): proc: Better ownership of files for non-dumpable tasks in user namespaces proc: Rename in proc_inode rename sysctl_inodes sibling_inodes proc: Generalize proc_sys_prune_dcache into proc_prune_siblings_dcache proc: Clear the pieces of proc_inode that proc_evict_inode cares about proc: Use d_invalidate in proc_prune_siblings_dcache proc: Use a list of inodes to flush from proc Joel Fernandes (Google) (1): pidfd: add polling support fs/proc/base.c | 242 ++++++++++++++++++++------------------------- fs/proc/fd.c | 20 +--- fs/proc/inode.c | 67 ++++++++++++- fs/proc/internal.h | 22 ++--- fs/proc/namespaces.c | 3 +- fs/proc/proc_sysctl.c | 45 ++------- fs/proc/self.c | 6 +- fs/proc/thread_self.c | 5 +- include/linux/pid.h | 5 + include/linux/proc_fs.h | 4 +- include/uapi/linux/sched.h | 1 + kernel/exit.c | 5 +- kernel/fork.c | 145 ++++++++++++++++++++++++++- kernel/pid.c | 3 + kernel/signal.c | 11 +++ security/selinux/hooks.c | 1 + 16 files changed, 357 insertions(+), 228 deletions(-) [1] A test program to open the directory (/proc/<pid>/ns) #include <stdio.h> #include <sys/types.h> #include <dirent.h> #include <errno.h> int main(int argc, char *argv[]) { DIR *dip; struct dirent *dit; if (argc < 2) { printf("Usage :%s <directory>\n", argv[0]); return -1; } if ((dip = opendir(argv[1])) == NULL) { perror("opendir"); return -1; } printf("pid: %d\n", getpid()); while((dit = readdir (dip)) != NULL) { printf("%s\n", dit->d_name); } while (1) sleep (1); return 0; } [2] Adding some debugging switches to the kernel, also adding a delay between proc_flush_task and __exit_signal in release_task(): diff --git a/fs/dcache.c b/fs/dcache.c index 05bad55..fafad37 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -84,6 +84,9 @@ int sysctl_vfs_cache_pressure __read_mostly = 100; EXPORT_SYMBOL_GPL(sysctl_vfs_cache_pressure); +int sysctl_dentry_debug_trace __read_mostly = 0; +EXPORT_SYMBOL_GPL(sysctl_dentry_debug_trace); + __cacheline_aligned_in_smp DEFINE_SEQLOCK(rename_lock); EXPORT_SYMBOL(rename_lock); @@ -758,6 +761,26 @@ static inline bool fast_dput(struct dentry *dentry) return 0; } +#define DENTRY_DEBUG_TRACE(dentry, keywords) \ +do { \ + if (sysctl_dentry_debug_trace) \ + printk("XXX %s:%d " \ + "dentry=%s/%p, flag=%x, cnt=%d, inode=%p, " \ + "pdentry=%s/%p, pflag=%x, pcnt=%d, pinode=%p, " \ + "keywords: %s\n", \ + __func__, __LINE__, \ + dentry->d_name.name, \ + dentry, \ + dentry->d_flags, \ + dentry->d_lockref.count, \ + dentry->d_inode, \ + dentry->d_parent->d_name.name, \ + dentry->d_parent, \ + dentry->d_parent->d_flags, \ + dentry->d_parent->d_lockref.count, \ + dentry->d_parent->d_inode, \ + keywords); \ +} while (0) /* * This is dput @@ -804,6 +827,8 @@ void dput(struct dentry *dentry) WARN_ON(d_in_lookup(dentry)); + DENTRY_DEBUG_TRACE(dentry, "be checked"); + /* Unreachable? Get rid of it */ if (unlikely(d_unhashed(dentry))) goto kill_it; @@ -812,8 +837,10 @@ void dput(struct dentry *dentry) goto kill_it; if (unlikely(dentry->d_flags & DCACHE_OP_DELETE)) { - if (dentry->d_op->d_delete(dentry)) + if (dentry->d_op->d_delete(dentry)) { + DENTRY_DEBUG_TRACE(dentry, "be killed"); goto kill_it; + } } if (!(dentry->d_flags & DCACHE_REFERENCED)) @@ -822,6 +849,9 @@ void dput(struct dentry *dentry) dentry->d_lockref.count--; spin_unlock(&dentry->d_lock); + + DENTRY_DEBUG_TRACE(dentry, "be cached"); + return; kill_it: diff --git a/fs/proc/base.c b/fs/proc/base.c index b9e4183..419a409 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -3090,6 +3090,8 @@ void proc_flush_task(struct task_struct *task) } } +extern int sysctl_dentry_debug_trace; + static int proc_pid_instantiate(struct inode *dir, struct dentry * dentry, struct task_struct *task, const void *ptr) @@ -3111,6 +3113,12 @@ static int proc_pid_instantiate(struct inode *dir, d_set_d_op(dentry, &pid_dentry_operations); d_add(dentry, inode); + + if (sysctl_dentry_debug_trace) + printk("XXX %s:%d pid=%d tid=%d entry=%s/%p\n", + __func__, __LINE__, task->pid, task->tgid, + dentry->d_name.name, dentry); + /* Close the race of the process dying before we return the dentry */ if (pid_revalidate(dentry, 0)) return 0; diff --git a/kernel/exit.c b/kernel/exit.c index 27f4168..2b3e1b6 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -55,6 +55,8 @@ #include <linux/shm.h> #include <linux/kcov.h> +#include <linux/delay.h> + #include <asm/uaccess.h> #include <asm/unistd.h> #include <asm/pgtable.h> @@ -164,6 +166,8 @@ static void delayed_put_task_struct(struct rcu_head *rhp) put_task_struct(tsk); } +int sysctl_dentry_debug_delay __read_mostly = 0; +int sysctl_dentry_debug_pid __read_mostly = 0; void release_task(struct task_struct *p) { @@ -178,6 +182,11 @@ void release_task(struct task_struct *p) proc_flush_task(p); + if (sysctl_dentry_debug_delay && p->pid == sysctl_dentry_debug_pid) { + while (sysctl_dentry_debug_delay) + mdelay(1); + } + write_lock_irq(&tasklist_lock); ptrace_release_task(p); __exit_signal(p); diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 513e6da..27f1395 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -282,6 +282,10 @@ static int sysrq_sysctl_handler(struct ctl_table *table, int write, static int max_extfrag_threshold = 1000; #endif +extern int sysctl_dentry_debug_trace; +extern int sysctl_dentry_debug_delay; +extern int sysctl_dentry_debug_pid; + static struct ctl_table kern_table[] = { { .procname = "sched_child_runs_first", @@ -1498,6 +1502,30 @@ static int sysrq_sysctl_handler(struct ctl_table *table, int write, .proc_handler = proc_dointvec, .extra1 = &zero, }, + { + .procname = "dentry_debug_trace", + .data = &sysctl_dentry_debug_trace, + .maxlen = sizeof(sysctl_dentry_debug_trace), + .mode = 0644, + .proc_handler = proc_dointvec, + .extra1 = &zero, + }, + { + .procname = "dentry_debug_delay", + .data = &sysctl_dentry_debug_delay, + .maxlen = sizeof(sysctl_dentry_debug_delay), + .mode = 0644, + .proc_handler = proc_dointvec, + .extra1 = &zero, + }, + { + .procname = "dentry_debug_pid", + .data = &sysctl_dentry_debug_pid, + .maxlen = sizeof(sysctl_dentry_debug_pid), + .mode = 0644, + .proc_handler = proc_dointvec, + .extra1 = &zero, + }, #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT { .procname = "legacy_va_layout", Signed-off-by: Wen Yang <wenyang(a)linux.alibaba.com> Cc: Pavel Emelyanov <xemul(a)openvz.org> Cc: Oleg Nesterov <oleg(a)tv-sign.ru> Cc: Sukadev Bhattiprolu <sukadev(a)us.ibm.com> Cc: Paul Menage <menage(a)google.com> Cc: "Eric W. Biederman" <ebiederm(a)xmission.com> Cc: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Cc: <stable(a)vger.kernel.org> -- 1.8.3.1

4 years, 8 months

4
18
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[PATCH 4.19 1/7] mm: drop meminit_pfn_in_nid as it is redundant

by Pavel Tatashin

From: Alexander Duyck <alexander.h.duyck(a)linux.intel.com> From: Alexander Duyck <alexander.h.duyck(a)linux.intel.com> commit 56ec43d8b02719402c9fcf984feb52ec2300f8a5 upstream. As best as I can tell the meminit_pfn_in_nid call is completely redundant. The deferred memory initialization is already making use of for_each_free_mem_range which in turn will call into __next_mem_range which will only return a memory range if it matches the node ID provided assuming it is not NUMA_NO_NODE. I am operating on the assumption that there are no zones or pgdata_t structures that have a NUMA node of NUMA_NO_NODE associated with them. If that is the case then __next_mem_range will never return a memory range that doesn't match the zone's node ID and as such the check is redundant. So one piece I would like to verify on this is if this works for ia64. Technically it was using a different approach to get the node ID, but it seems to have the node ID also encoded into the memblock. So I am assuming this is okay, but would like to get confirmation on that. On my x86_64 test system with 384GB of memory per node I saw a reduction in initialization time from 2.80s to 1.85s as a result of this patch. Link: http://lkml.kernel.org/r/20190405221219.12227.93957.stgit@localhost.localdo… Signed-off-by: Alexander Duyck <alexander.h.duyck(a)linux.intel.com> Reviewed-by: Pavel Tatashin <pavel.tatashin(a)microsoft.com> Acked-by: Michal Hocko <mhocko(a)suse.com> Cc: Mike Rapoport <rppt(a)linux.ibm.com> Cc: Dan Williams <dan.j.williams(a)intel.com> Cc: Dave Jiang <dave.jiang(a)intel.com> Cc: David S. Miller <davem(a)davemloft.net> Cc: Ingo Molnar <mingo(a)kernel.org> Cc: Khalid Aziz <khalid.aziz(a)oracle.com> Cc: "Kirill A. Shutemov" <kirill.shutemov(a)linux.intel.com> Cc: Laurent Dufour <ldufour(a)linux.vnet.ibm.com> Cc: Matthew Wilcox <willy(a)infradead.org> Cc: Mel Gorman <mgorman(a)techsingularity.net> Cc: Mike Rapoport <rppt(a)linux.vnet.ibm.com> Cc: Pavel Tatashin <pasha.tatashin(a)soleen.com> Cc: Vlastimil Babka <vbabka(a)suse.cz> Cc: <yi.z.zhang(a)linux.intel.com> Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds(a)linux-foundation.org> Signed-off-by: Pavel Tatashin <pasha.tatashin(a)soleen.com> --- mm/page_alloc.c | 51 ++++++++++++++----------------------------------- 1 file changed, 14 insertions(+), 37 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index d8c3051387d1..c86a117acb5b 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1321,36 +1321,22 @@ int __meminit early_pfn_to_nid(unsigned long pfn) #endif #ifdef CONFIG_NODES_SPAN_OTHER_NODES -static inline bool __meminit __maybe_unused -meminit_pfn_in_nid(unsigned long pfn, int node, - struct mminit_pfnnid_cache *state) +/* Only safe to use early in boot when initialisation is single-threaded */ +static inline bool __meminit early_pfn_in_nid(unsigned long pfn, int node) { int nid; - nid = __early_pfn_to_nid(pfn, state); + nid = __early_pfn_to_nid(pfn, &early_pfnnid_cache); if (nid >= 0 && nid != node) return false; return true; } -/* Only safe to use early in boot when initialisation is single-threaded */ -static inline bool __meminit early_pfn_in_nid(unsigned long pfn, int node) -{ - return meminit_pfn_in_nid(pfn, node, &early_pfnnid_cache); -} - #else - static inline bool __meminit early_pfn_in_nid(unsigned long pfn, int node) { return true; } -static inline bool __meminit __maybe_unused -meminit_pfn_in_nid(unsigned long pfn, int node, - struct mminit_pfnnid_cache *state) -{ - return true; -} #endif @@ -1480,21 +1466,13 @@ static inline void __init pgdat_init_report_one_done(void) * * Then, we check if a current large page is valid by only checking the validity * of the head pfn. - * - * Finally, meminit_pfn_in_nid is checked on systems where pfns can interleave - * within a node: a pfn is between start and end of a node, but does not belong - * to this memory node. */ -static inline bool __init -deferred_pfn_valid(int nid, unsigned long pfn, - struct mminit_pfnnid_cache *nid_init_state) +static inline bool __init deferred_pfn_valid(unsigned long pfn) { if (!pfn_valid_within(pfn)) return false; if (!(pfn & (pageblock_nr_pages - 1)) && !pfn_valid(pfn)) return false; - if (!meminit_pfn_in_nid(pfn, nid, nid_init_state)) - return false; return true; } @@ -1502,15 +1480,14 @@ deferred_pfn_valid(int nid, unsigned long pfn, * Free pages to buddy allocator. Try to free aligned pages in * pageblock_nr_pages sizes. */ -static void __init deferred_free_pages(int nid, int zid, unsigned long pfn, +static void __init deferred_free_pages(unsigned long pfn, unsigned long end_pfn) { - struct mminit_pfnnid_cache nid_init_state = { }; unsigned long nr_pgmask = pageblock_nr_pages - 1; unsigned long nr_free = 0; for (; pfn < end_pfn; pfn++) { - if (!deferred_pfn_valid(nid, pfn, &nid_init_state)) { + if (!deferred_pfn_valid(pfn)) { deferred_free_range(pfn - nr_free, nr_free); nr_free = 0; } else if (!(pfn & nr_pgmask)) { @@ -1530,17 +1507,18 @@ static void __init deferred_free_pages(int nid, int zid, unsigned long pfn, * by performing it only once every pageblock_nr_pages. * Return number of pages initialized. */ -static unsigned long __init deferred_init_pages(int nid, int zid, +static unsigned long __init deferred_init_pages(struct zone *zone, unsigned long pfn, unsigned long end_pfn) { - struct mminit_pfnnid_cache nid_init_state = { }; unsigned long nr_pgmask = pageblock_nr_pages - 1; + int nid = zone_to_nid(zone); unsigned long nr_pages = 0; + int zid = zone_idx(zone); struct page *page = NULL; for (; pfn < end_pfn; pfn++) { - if (!deferred_pfn_valid(nid, pfn, &nid_init_state)) { + if (!deferred_pfn_valid(pfn)) { page = NULL; continue; } else if (!page || !(pfn & nr_pgmask)) { @@ -1603,12 +1581,12 @@ static int __init deferred_init_memmap(void *data) for_each_free_mem_range(i, nid, MEMBLOCK_NONE, &spa, &epa, NULL) { spfn = max_t(unsigned long, first_init_pfn, PFN_UP(spa)); epfn = min_t(unsigned long, zone_end_pfn(zone), PFN_DOWN(epa)); - nr_pages += deferred_init_pages(nid, zid, spfn, epfn); + nr_pages += deferred_init_pages(zone, spfn, epfn); } for_each_free_mem_range(i, nid, MEMBLOCK_NONE, &spa, &epa, NULL) { spfn = max_t(unsigned long, first_init_pfn, PFN_UP(spa)); epfn = min_t(unsigned long, zone_end_pfn(zone), PFN_DOWN(epa)); - deferred_free_pages(nid, zid, spfn, epfn); + deferred_free_pages(spfn, epfn); } pgdat_resize_unlock(pgdat, &flags); @@ -1640,7 +1618,6 @@ static int __init deferred_init_memmap(void *data) static noinline bool __init deferred_grow_zone(struct zone *zone, unsigned int order) { - int zid = zone_idx(zone); int nid = zone_to_nid(zone); pg_data_t *pgdat = NODE_DATA(nid); unsigned long nr_pages_needed = ALIGN(1 << order, PAGES_PER_SECTION); @@ -1690,7 +1667,7 @@ deferred_grow_zone(struct zone *zone, unsigned int order) while (spfn < epfn && nr_pages < nr_pages_needed) { t = ALIGN(spfn + PAGES_PER_SECTION, PAGES_PER_SECTION); first_deferred_pfn = min(t, epfn); - nr_pages += deferred_init_pages(nid, zid, spfn, + nr_pages += deferred_init_pages(zone, spfn, first_deferred_pfn); spfn = first_deferred_pfn; } @@ -1702,7 +1679,7 @@ deferred_grow_zone(struct zone *zone, unsigned int order) for_each_free_mem_range(i, nid, MEMBLOCK_NONE, &spa, &epa, NULL) { spfn = max_t(unsigned long, first_init_pfn, PFN_UP(spa)); epfn = min_t(unsigned long, first_deferred_pfn, PFN_DOWN(epa)); - deferred_free_pages(nid, zid, spfn, epfn); + deferred_free_pages(spfn, epfn); if (first_deferred_pfn == epfn) break; -- 2.25.1

4 years, 8 months

2
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[PATCH 5.2 00/20] 5.2.6-stable review

by Greg Kroah-Hartman

This is the start of the stable review cycle for the 5.2.6 release. There are 20 patches in this series, all will be posted as a response to this one. If anyone has any issues with these being applied, please let me know. Responses should be made by Sun 04 Aug 2019 09:19:34 AM UTC. Anything received after that time might be too late. The whole patch series can be found in one patch at: https://www.kernel.org/pub/linux/kernel/v5.x/stable-review/patch-5.2.6-rc1.… or in the git tree and branch at: git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.2.y and the diffstat can be found below. thanks, greg k-h ------------- Pseudo-Shortlog of commits: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Linux 5.2.6-rc1 Yan, Zheng <zyan(a)redhat.com> ceph: hold i_ceph_lock when removing caps for freeing inode Yoshinori Sato <ysato(a)users.sourceforge.jp> Fix allyesconfig output. Miroslav Lichvar <mlichvar(a)redhat.com> drivers/pps/pps.c: clear offset flags in PPS_SETPARAMS ioctl Linus Torvalds <torvalds(a)linux-foundation.org> /proc/<pid>/cmdline: add back the setproctitle() special case Linus Torvalds <torvalds(a)linux-foundation.org> /proc/<pid>/cmdline: remove all the special cases Jann Horn <jannh(a)google.com> sched/fair: Use RCU accessors consistently for ->numa_group Jann Horn <jannh(a)google.com> sched/fair: Don't free p->numa_faults with concurrent readers Vladis Dronov <vdronov(a)redhat.com> Bluetooth: hci_uart: check for missing tty operations Marta Rybczynska <mrybczyn(a)kalray.eu> nvme: fix multipath crash when ANA is deactivated Florian Westphal <fw(a)strlen.de> xfrm: policy: fix bydst hlist corruption on hash rebuild Luke Nowakowski-Krijger <lnowakow(a)eng.ucsd.edu> media: radio-raremono: change devm_k*alloc to k*alloc Benjamin Coddington <bcodding(a)redhat.com> NFS: Cleanup if nfs_match_client is interrupted Andrey Konovalov <andreyknvl(a)google.com> media: pvrusb2: use a different format for warnings Oliver Neukum <oneukum(a)suse.com> media: cpia2_usb: first wake up, then free in disconnect Fabio Estevam <festevam(a)gmail.com> ath10k: Change the warning message string Sean Young <sean(a)mess.org> media: au0828: fix null dereference in error path Stanislav Fomichev <sdf(a)google.com> bpf: fix NULL deref in btf_type_is_resolve_source_only Takashi Iwai <tiwai(a)suse.de> ALSA: usb-audio: Sanity checks for each pipe and EP types Phong Tran <tranmanphong(a)gmail.com> ISDN: hfcsusb: checking idx of ep configuration Sunil Muthuswamy <sunilmut(a)microsoft.com> vsock: correct removal of socket from the list ------------- Diffstat: Makefile | 4 +- arch/sh/boards/Kconfig | 14 +-- drivers/bluetooth/hci_ath.c | 3 + drivers/bluetooth/hci_bcm.c | 3 + drivers/bluetooth/hci_intel.c | 3 + drivers/bluetooth/hci_ldisc.c | 13 +++ drivers/bluetooth/hci_mrvl.c | 3 + drivers/bluetooth/hci_qca.c | 3 + drivers/bluetooth/hci_uart.h | 1 + drivers/isdn/hardware/mISDN/hfcsusb.c | 3 + drivers/media/radio/radio-raremono.c | 30 ++++-- drivers/media/usb/au0828/au0828-core.c | 12 +-- drivers/media/usb/cpia2/cpia2_usb.c | 3 +- drivers/media/usb/pvrusb2/pvrusb2-hdw.c | 4 +- drivers/media/usb/pvrusb2/pvrusb2-i2c-core.c | 6 +- drivers/media/usb/pvrusb2/pvrusb2-std.c | 2 +- drivers/net/wireless/ath/ath10k/usb.c | 2 +- drivers/nvme/host/multipath.c | 8 +- drivers/nvme/host/nvme.h | 6 +- drivers/pps/pps.c | 8 ++ fs/ceph/caps.c | 10 +- fs/ceph/inode.c | 2 +- fs/ceph/super.h | 2 +- fs/exec.c | 2 +- fs/nfs/client.c | 4 +- fs/proc/base.c | 132 +++++++++++++----------- include/linux/sched.h | 10 +- include/linux/sched/numa_balancing.h | 4 +- kernel/bpf/btf.c | 12 +-- kernel/fork.c | 2 +- kernel/sched/fair.c | 144 +++++++++++++++++++-------- net/vmw_vsock/af_vsock.c | 38 ++----- net/xfrm/xfrm_policy.c | 12 ++- sound/usb/helper.c | 17 ++++ sound/usb/helper.h | 1 + sound/usb/quirks.c | 18 +++- tools/testing/selftests/net/xfrm_policy.sh | 27 ++++- 37 files changed, 368 insertions(+), 200 deletions(-)

4 years, 8 months

8
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FAILED: patch "[PATCH] of: fix linker-section match-table corruption" failed to apply to 5.4-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 5812b32e01c6d86ba7a84110702b46d8a8531fe9 Mon Sep 17 00:00:00 2001 From: Johan Hovold <johan(a)kernel.org> Date: Mon, 23 Nov 2020 11:23:12 +0100 Subject: [PATCH] of: fix linker-section match-table corruption Specify type alignment when declaring linker-section match-table entries to prevent gcc from increasing alignment and corrupting the various tables with padding (e.g. timers, irqchips, clocks, reserved memory). This is specifically needed on x86 where gcc (typically) aligns larger objects like struct of_device_id with static extent on 32-byte boundaries which at best prevents matching on anything but the first entry. Specifying alignment when declaring variables suppresses this optimisation. Here's a 64-bit example where all entries are corrupt as 16 bytes of padding has been inserted before the first entry: ffffffff8266b4b0 D __clk_of_table ffffffff8266b4c0 d __of_table_fixed_factor_clk ffffffff8266b5a0 d __of_table_fixed_clk ffffffff8266b680 d __clk_of_table_sentinel And here's a 32-bit example where the 8-byte-aligned table happens to be placed on a 32-byte boundary so that all but the first entry are corrupt due to the 28 bytes of padding inserted between entries: 812b3ec0 D __irqchip_of_table 812b3ec0 d __of_table_irqchip1 812b3fa0 d __of_table_irqchip2 812b4080 d __of_table_irqchip3 812b4160 d irqchip_of_match_end Verified on x86 using gcc-9.3 and gcc-4.9 (which uses 64-byte alignment), and on arm using gcc-7.2. Note that there are no in-tree users of these tables on x86 currently (even if they are included in the image). Fixes: 54196ccbe0ba ("of: consolidate linker section OF match table declarations") Fixes: f6e916b82022 ("irqchip: add basic infrastructure") Cc: stable <stable(a)vger.kernel.org> # 3.9 Signed-off-by: Johan Hovold <johan(a)kernel.org> Link: https://lore.kernel.org/r/20201123102319.8090-2-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> diff --git a/include/linux/of.h b/include/linux/of.h index 5d51891cbf1a..af655d264f10 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -1300,6 +1300,7 @@ static inline int of_get_available_child_count(const struct device_node *np) #define _OF_DECLARE(table, name, compat, fn, fn_type) \ static const struct of_device_id __of_table_##name \ __used __section("__" #table "_of_table") \ + __aligned(__alignof__(struct of_device_id)) \ = { .compatible = compat, \ .data = (fn == (fn_type)NULL) ? fn : fn } #else

4 years, 8 months

3
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FAILED: patch "[PATCH] null_blk: Fix zone size initialization" failed to apply to 4.19-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 0ebcdd702f49aeb0ad2e2d894f8c124a0acc6e23 Mon Sep 17 00:00:00 2001 From: Damien Le Moal <damien.lemoal(a)wdc.com> Date: Fri, 20 Nov 2020 10:55:11 +0900 Subject: [PATCH] null_blk: Fix zone size initialization For a null_blk device with zoned mode enabled is currently initialized with a number of zones equal to the device capacity divided by the zone size, without considering if the device capacity is a multiple of the zone size. If the zone size is not a divisor of the capacity, the zones end up not covering the entire capacity, potentially resulting is out of bounds accesses to the zone array. Fix this by adding one last smaller zone with a size equal to the remainder of the disk capacity divided by the zone size if the capacity is not a multiple of the zone size. For such smaller last zone, the zone capacity is also checked so that it does not exceed the smaller zone size. Reported-by: Naohiro Aota <naohiro.aota(a)wdc.com> Fixes: ca4b2a011948 ("null_blk: add zone support") Cc: stable(a)vger.kernel.org Signed-off-by: Damien Le Moal <damien.lemoal(a)wdc.com> Reviewed-by: Christoph Hellwig <hch(a)lst.de> Reviewed-by: Johannes Thumshirn <johannes.thumshirn(a)wdc.com> Signed-off-by: Jens Axboe <axboe(a)kernel.dk> diff --git a/drivers/block/null_blk_zoned.c b/drivers/block/null_blk_zoned.c index beb34b4f76b0..1d0370d91fe7 100644 --- a/drivers/block/null_blk_zoned.c +++ b/drivers/block/null_blk_zoned.c @@ -6,8 +6,7 @@ #define CREATE_TRACE_POINTS #include "null_blk_trace.h" -/* zone_size in MBs to sectors. */ -#define ZONE_SIZE_SHIFT 11 +#define MB_TO_SECTS(mb) (((sector_t)mb * SZ_1M) >> SECTOR_SHIFT) static inline unsigned int null_zone_no(struct nullb_device *dev, sector_t sect) { @@ -16,7 +15,7 @@ static inline unsigned int null_zone_no(struct nullb_device *dev, sector_t sect) int null_init_zoned_dev(struct nullb_device *dev, struct request_queue *q) { - sector_t dev_size = (sector_t)dev->size * 1024 * 1024; + sector_t dev_capacity_sects, zone_capacity_sects; sector_t sector = 0; unsigned int i; @@ -38,9 +37,13 @@ int null_init_zoned_dev(struct nullb_device *dev, struct request_queue *q) return -EINVAL; } - dev->zone_size_sects = dev->zone_size << ZONE_SIZE_SHIFT; - dev->nr_zones = dev_size >> - (SECTOR_SHIFT + ilog2(dev->zone_size_sects)); + zone_capacity_sects = MB_TO_SECTS(dev->zone_capacity); + dev_capacity_sects = MB_TO_SECTS(dev->size); + dev->zone_size_sects = MB_TO_SECTS(dev->zone_size); + dev->nr_zones = dev_capacity_sects >> ilog2(dev->zone_size_sects); + if (dev_capacity_sects & (dev->zone_size_sects - 1)) + dev->nr_zones++; + dev->zones = kvmalloc_array(dev->nr_zones, sizeof(struct blk_zone), GFP_KERNEL | __GFP_ZERO); if (!dev->zones) @@ -101,8 +104,12 @@ int null_init_zoned_dev(struct nullb_device *dev, struct request_queue *q) struct blk_zone *zone = &dev->zones[i]; zone->start = zone->wp = sector; - zone->len = dev->zone_size_sects; - zone->capacity = dev->zone_capacity << ZONE_SIZE_SHIFT; + if (zone->start + dev->zone_size_sects > dev_capacity_sects) + zone->len = dev_capacity_sects - zone->start; + else + zone->len = dev->zone_size_sects; + zone->capacity = + min_t(sector_t, zone->len, zone_capacity_sects); zone->type = BLK_ZONE_TYPE_SEQWRITE_REQ; zone->cond = BLK_ZONE_COND_EMPTY;

4 years, 8 months

4
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[PATCH fixes v3] platform/x86: ideapad-laptop: Disable touchpad_switch for ELAN0634

by Jiaxun Yang

Newer ideapads (e.g.: Yoga 14s, 720S 14) come with ELAN0634 touchpad do not use EC to switch touchpad. Reading VPCCMD_R_TOUCHPAD will return zero thus touchpad may be blocked unexpectedly. Writing VPCCMD_W_TOUCHPAD may cause a spurious key press. Add has_touchpad_switch to workaround these machines. Signed-off-by: Jiaxun Yang <jiaxun.yang(a)flygoat.com> Cc: stable(a)vger.kernel.org # 5.4+ -- v2: Specify touchpad to ELAN0634 v3: Stupid missing ! in v2 --- drivers/platform/x86/ideapad-laptop.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c index 7598cd46cf60..427970b3b0da 100644 --- a/drivers/platform/x86/ideapad-laptop.c +++ b/drivers/platform/x86/ideapad-laptop.c @@ -92,6 +92,7 @@ struct ideapad_private { struct dentry *debug; unsigned long cfg; bool has_hw_rfkill_switch; + bool has_touchpad_switch; const char *fnesc_guid; }; @@ -535,7 +536,9 @@ static umode_t ideapad_is_visible(struct kobject *kobj, } else if (attr == &dev_attr_fn_lock.attr) { supported = acpi_has_method(priv->adev->handle, "HALS") && acpi_has_method(priv->adev->handle, "SALS"); - } else + } else if (attr == &dev_attr_touchpad.attr) + supported = priv->has_touchpad_switch; + else supported = true; return supported ? attr->mode : 0; @@ -867,6 +870,9 @@ static void ideapad_sync_touchpad_state(struct ideapad_private *priv) { unsigned long value; + if (!priv->has_touchpad_switch) + return; + /* Without reading from EC touchpad LED doesn't switch state */ if (!read_ec_data(priv->adev->handle, VPCCMD_R_TOUCHPAD, &value)) { /* Some IdeaPads don't really turn off touchpad - they only @@ -989,6 +995,9 @@ static int ideapad_acpi_add(struct platform_device *pdev) priv->platform_device = pdev; priv->has_hw_rfkill_switch = dmi_check_system(hw_rfkill_list); + /* Most ideapads with ELAN0634 touchpad don't use EC touchpad switch */ + priv->has_touchpad_switch = !acpi_dev_present("PNP0C50", "ELAN0634", -1); + ret = ideapad_sysfs_init(priv); if (ret) return ret; @@ -1006,6 +1015,10 @@ static int ideapad_acpi_add(struct platform_device *pdev) if (!priv->has_hw_rfkill_switch) write_ec_cmd(priv->adev->handle, VPCCMD_W_RF, 1); + /* The same for Touchpad */ + if (!priv->has_touchpad_switch) + write_ec_cmd(priv->adev->handle, VPCCMD_W_TOUCHPAD, 1); + for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++) if (test_bit(ideapad_rfk_data[i].cfgbit, &priv->cfg)) ideapad_register_rfkill(priv, i); -- 2.30.0

4 years, 8 months

2
1
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FAILED: patch "[PATCH] null_blk: Fix zone size initialization" failed to apply to 5.4-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 0ebcdd702f49aeb0ad2e2d894f8c124a0acc6e23 Mon Sep 17 00:00:00 2001 From: Damien Le Moal <damien.lemoal(a)wdc.com> Date: Fri, 20 Nov 2020 10:55:11 +0900 Subject: [PATCH] null_blk: Fix zone size initialization For a null_blk device with zoned mode enabled is currently initialized with a number of zones equal to the device capacity divided by the zone size, without considering if the device capacity is a multiple of the zone size. If the zone size is not a divisor of the capacity, the zones end up not covering the entire capacity, potentially resulting is out of bounds accesses to the zone array. Fix this by adding one last smaller zone with a size equal to the remainder of the disk capacity divided by the zone size if the capacity is not a multiple of the zone size. For such smaller last zone, the zone capacity is also checked so that it does not exceed the smaller zone size. Reported-by: Naohiro Aota <naohiro.aota(a)wdc.com> Fixes: ca4b2a011948 ("null_blk: add zone support") Cc: stable(a)vger.kernel.org Signed-off-by: Damien Le Moal <damien.lemoal(a)wdc.com> Reviewed-by: Christoph Hellwig <hch(a)lst.de> Reviewed-by: Johannes Thumshirn <johannes.thumshirn(a)wdc.com> Signed-off-by: Jens Axboe <axboe(a)kernel.dk> diff --git a/drivers/block/null_blk_zoned.c b/drivers/block/null_blk_zoned.c index beb34b4f76b0..1d0370d91fe7 100644 --- a/drivers/block/null_blk_zoned.c +++ b/drivers/block/null_blk_zoned.c @@ -6,8 +6,7 @@ #define CREATE_TRACE_POINTS #include "null_blk_trace.h" -/* zone_size in MBs to sectors. */ -#define ZONE_SIZE_SHIFT 11 +#define MB_TO_SECTS(mb) (((sector_t)mb * SZ_1M) >> SECTOR_SHIFT) static inline unsigned int null_zone_no(struct nullb_device *dev, sector_t sect) { @@ -16,7 +15,7 @@ static inline unsigned int null_zone_no(struct nullb_device *dev, sector_t sect) int null_init_zoned_dev(struct nullb_device *dev, struct request_queue *q) { - sector_t dev_size = (sector_t)dev->size * 1024 * 1024; + sector_t dev_capacity_sects, zone_capacity_sects; sector_t sector = 0; unsigned int i; @@ -38,9 +37,13 @@ int null_init_zoned_dev(struct nullb_device *dev, struct request_queue *q) return -EINVAL; } - dev->zone_size_sects = dev->zone_size << ZONE_SIZE_SHIFT; - dev->nr_zones = dev_size >> - (SECTOR_SHIFT + ilog2(dev->zone_size_sects)); + zone_capacity_sects = MB_TO_SECTS(dev->zone_capacity); + dev_capacity_sects = MB_TO_SECTS(dev->size); + dev->zone_size_sects = MB_TO_SECTS(dev->zone_size); + dev->nr_zones = dev_capacity_sects >> ilog2(dev->zone_size_sects); + if (dev_capacity_sects & (dev->zone_size_sects - 1)) + dev->nr_zones++; + dev->zones = kvmalloc_array(dev->nr_zones, sizeof(struct blk_zone), GFP_KERNEL | __GFP_ZERO); if (!dev->zones) @@ -101,8 +104,12 @@ int null_init_zoned_dev(struct nullb_device *dev, struct request_queue *q) struct blk_zone *zone = &dev->zones[i]; zone->start = zone->wp = sector; - zone->len = dev->zone_size_sects; - zone->capacity = dev->zone_capacity << ZONE_SIZE_SHIFT; + if (zone->start + dev->zone_size_sects > dev_capacity_sects) + zone->len = dev_capacity_sects - zone->start; + else + zone->len = dev->zone_size_sects; + zone->capacity = + min_t(sector_t, zone->len, zone_capacity_sects); zone->type = BLK_ZONE_TYPE_SEQWRITE_REQ; zone->cond = BLK_ZONE_COND_EMPTY;

4 years, 8 months

4
3
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FAILED: patch "[PATCH] ext4: don't remount read-only with errors=continue on reboot" failed to apply to 4.19-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From b08070eca9e247f60ab39d79b2c25d274750441f Mon Sep 17 00:00:00 2001 From: Jan Kara <jack(a)suse.cz> Date: Fri, 27 Nov 2020 12:33:54 +0100 Subject: [PATCH] ext4: don't remount read-only with errors=continue on reboot ext4_handle_error() with errors=continue mount option can accidentally remount the filesystem read-only when the system is rebooting. Fix that. Fixes: 1dc1097ff60e ("ext4: avoid panic during forced reboot") Signed-off-by: Jan Kara <jack(a)suse.cz> Reviewed-by: Andreas Dilger <adilger(a)dilger.ca> Cc: stable(a)kernel.org Link: https://lore.kernel.org/r/20201127113405.26867-2-jack@suse.cz Signed-off-by: Theodore Ts'o <tytso(a)mit.edu> diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 872d45a131ca..3ef84e8ab1ae 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -666,19 +666,17 @@ static bool system_going_down(void) static void ext4_handle_error(struct super_block *sb) { + journal_t *journal = EXT4_SB(sb)->s_journal; + if (test_opt(sb, WARN_ON_ERROR)) WARN_ON_ONCE(1); - if (sb_rdonly(sb)) + if (sb_rdonly(sb) || test_opt(sb, ERRORS_CONT)) return; - if (!test_opt(sb, ERRORS_CONT)) { - journal_t *journal = EXT4_SB(sb)->s_journal; - - ext4_set_mount_flag(sb, EXT4_MF_FS_ABORTED); - if (journal) - jbd2_journal_abort(journal, -EIO); - } + ext4_set_mount_flag(sb, EXT4_MF_FS_ABORTED); + if (journal) + jbd2_journal_abort(journal, -EIO); /* * We force ERRORS_RO behavior when system is rebooting. Otherwise we * could panic during 'reboot -f' as the underlying device got already

4 years, 8 months

3
4
0 0

FAILED: patch "[PATCH] ext4: don't remount read-only with errors=continue on reboot" failed to apply to 5.4-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From b08070eca9e247f60ab39d79b2c25d274750441f Mon Sep 17 00:00:00 2001 From: Jan Kara <jack(a)suse.cz> Date: Fri, 27 Nov 2020 12:33:54 +0100 Subject: [PATCH] ext4: don't remount read-only with errors=continue on reboot ext4_handle_error() with errors=continue mount option can accidentally remount the filesystem read-only when the system is rebooting. Fix that. Fixes: 1dc1097ff60e ("ext4: avoid panic during forced reboot") Signed-off-by: Jan Kara <jack(a)suse.cz> Reviewed-by: Andreas Dilger <adilger(a)dilger.ca> Cc: stable(a)kernel.org Link: https://lore.kernel.org/r/20201127113405.26867-2-jack@suse.cz Signed-off-by: Theodore Ts'o <tytso(a)mit.edu> diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 872d45a131ca..3ef84e8ab1ae 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -666,19 +666,17 @@ static bool system_going_down(void) static void ext4_handle_error(struct super_block *sb) { + journal_t *journal = EXT4_SB(sb)->s_journal; + if (test_opt(sb, WARN_ON_ERROR)) WARN_ON_ONCE(1); - if (sb_rdonly(sb)) + if (sb_rdonly(sb) || test_opt(sb, ERRORS_CONT)) return; - if (!test_opt(sb, ERRORS_CONT)) { - journal_t *journal = EXT4_SB(sb)->s_journal; - - ext4_set_mount_flag(sb, EXT4_MF_FS_ABORTED); - if (journal) - jbd2_journal_abort(journal, -EIO); - } + ext4_set_mount_flag(sb, EXT4_MF_FS_ABORTED); + if (journal) + jbd2_journal_abort(journal, -EIO); /* * We force ERRORS_RO behavior when system is rebooting. Otherwise we * could panic during 'reboot -f' as the underlying device got already

4 years, 8 months

3
2
0 0

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