Y2038

y2038@lists.linaro.org

1 participants
1134 discussions

[PATCH] vfs: replace current_kernel_time64 with ktime equivalent

by Arnd Bergmann

current_time is one of the few callers of current_kernel_time64(), which is a wrapper around ktime_get_coarse_real_ts64(). This calls the latter directly for consistency with the rest of the kernel that is moving to the ktime_get_ family of time accessors. An open questions is whether we may want to actually call the more accurate ktime_get_real_ts64() for file systems that save high-resolution timestamps in their on-disk format. This would add a small but measurable overhead to each update of the inode stamps but lead to inode timestamps to actually have a usable resolution better than one jiffy (1 to 10 milliseconds normally). I traced the original addition of the current_kernel_time() call to set the nanosecond fields back to linux-2.5.48, where Andi Kleen added a patch with subject "nanosecond stat timefields". This adds the original call to current_kernel_time and the truncation to the resolution of the file system, but makes no mention of the intended accuracy. At the time, we had a do_gettimeofday() interface that on some architectures could return a microsecond-resolution timestamp, but there was no interface for getting an accurate timestamp in nanosecond resolution, neither inside the kernel nor from user space. This makes me suspect that the use of coarse timestamps was never really a conscious decision but instead a result of whatever API was available 16 years ago. Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> --- fs/inode.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/fs/inode.c b/fs/inode.c index 2c300e981796..e27bd9334939 100644 --- a/fs/inode.c +++ b/fs/inode.c @@ -2133,7 +2133,9 @@ EXPORT_SYMBOL(timespec64_trunc); */ struct timespec64 current_time(struct inode *inode) { - struct timespec64 now = current_kernel_time64(); + struct timespec64 now; + + ktime_get_coarse_real_ts64(&now); if (unlikely(!inode->i_sb)) { WARN(1, "current_time() called with uninitialized super_block in the inode"); -- 2.9.0

6 years, 11 months

[PATCH] scsi: lpfc: use monotonic timestamps for statistics

by Arnd Bergmann

The get_seconds() function suffers from a possible overflow in 2038 or 2106, as well as jitter due to settimeofday or leap second updates, and is deprecated. As we are interested in elapsed time only, using ktime_get_seconds() to read the CLOCK_MONOTONIC timebase is ideal here. This also lets us remove the hack that tries to deal with get_seconds() going slightly backwards, which cannot happen with montonic timestamps. Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> --- drivers/scsi/lpfc/lpfc_attr.c | 10 ++-------- drivers/scsi/lpfc/lpfc_sli.c | 4 ++-- drivers/scsi/lpfc/lpfc_sli.h | 2 +- 3 files changed, 5 insertions(+), 11 deletions(-) diff --git a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c index 729d343861f4..15c07481fe23 100644 --- a/drivers/scsi/lpfc/lpfc_attr.c +++ b/drivers/scsi/lpfc/lpfc_attr.c @@ -5891,7 +5891,6 @@ lpfc_get_stats(struct Scsi_Host *shost) struct lpfc_lnk_stat * lso = &psli->lnk_stat_offsets; LPFC_MBOXQ_t *pmboxq; MAILBOX_t *pmb; - unsigned long seconds; int rc = 0; /* @@ -5992,12 +5991,7 @@ lpfc_get_stats(struct Scsi_Host *shost) hs->dumped_frames = -1; - seconds = get_seconds(); - if (seconds < psli->stats_start) - hs->seconds_since_last_reset = seconds + - ((unsigned long)-1 - psli->stats_start); - else - hs->seconds_since_last_reset = seconds - psli->stats_start; + hs->seconds_since_last_reset = ktime_get_seconds() - psli->stats_start; mempool_free(pmboxq, phba->mbox_mem_pool); @@ -6076,7 +6070,7 @@ lpfc_reset_stats(struct Scsi_Host *shost) else lso->link_events = (phba->fc_eventTag >> 1); - psli->stats_start = get_seconds(); + psli->stats_start = ktime_get_seconds(); mempool_free(pmboxq, phba->mbox_mem_pool); diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c index 6f3c00a233ec..e6786a5db502 100644 --- a/drivers/scsi/lpfc/lpfc_sli.c +++ b/drivers/scsi/lpfc/lpfc_sli.c @@ -4591,7 +4591,7 @@ lpfc_sli_brdrestart_s3(struct lpfc_hba *phba) spin_unlock_irq(&phba->hbalock); memset(&psli->lnk_stat_offsets, 0, sizeof(psli->lnk_stat_offsets)); - psli->stats_start = get_seconds(); + psli->stats_start = ktime_get_seconds(); /* Give the INITFF and Post time to settle. */ mdelay(100); @@ -4638,7 +4638,7 @@ lpfc_sli_brdrestart_s4(struct lpfc_hba *phba) spin_unlock_irq(&phba->hbalock); memset(&psli->lnk_stat_offsets, 0, sizeof(psli->lnk_stat_offsets)); - psli->stats_start = get_seconds(); + psli->stats_start = ktime_get_seconds(); /* Reset HBA AER if it was enabled, note hba_flag was reset above */ if (hba_aer_enabled) diff --git a/drivers/scsi/lpfc/lpfc_sli.h b/drivers/scsi/lpfc/lpfc_sli.h index 431754195505..80b191d73190 100644 --- a/drivers/scsi/lpfc/lpfc_sli.h +++ b/drivers/scsi/lpfc/lpfc_sli.h @@ -339,7 +339,7 @@ struct lpfc_sli { struct lpfc_iocbq ** iocbq_lookup; /* array to lookup IOCB by IOTAG */ size_t iocbq_lookup_len; /* current lengs of the array */ uint16_t last_iotag; /* last allocated IOTAG */ - unsigned long stats_start; /* in seconds */ + time64_t stats_start; /* in seconds */ struct lpfc_lnk_stat lnk_stat_offsets; }; -- 2.9.0

6 years, 11 months

[PATCH] scsi_transport_fc: use 64-bit timestamps consistently

by Arnd Bergmann

The get_seconds() helper returns an 'unsigned long' value, which can overflow on 32-bit architectures. Since the interface we pass it into already uses a 64-bit type, we can just use ktime_get_real_seconds() instead. While we generally prefer local timestamps in CLOCK_MONOTONIC format (ktime_get_seconds), this keeps using the CLOCK_REALTIME version in order to maintain compatibility with existing code. Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> --- drivers/scsi/scsi_transport_fc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c index 1da3d71e9f61..bb6de88aa724 100644 --- a/drivers/scsi/scsi_transport_fc.c +++ b/drivers/scsi/scsi_transport_fc.c @@ -567,7 +567,7 @@ fc_host_post_event(struct Scsi_Host *shost, u32 event_number, INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC, FC_NL_ASYNC_EVENT, len); - event->seconds = get_seconds(); + event->seconds = ktime_get_real_seconds(); event->vendor_id = 0; event->host_no = shost->host_no; event->event_datalen = sizeof(u32); /* bytes */ @@ -635,7 +635,7 @@ fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number, INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC, FC_NL_ASYNC_EVENT, len); - event->seconds = get_seconds(); + event->seconds = ktime_get_real_seconds(); event->vendor_id = vendor_id; event->host_no = shost->host_no; event->event_datalen = data_len; /* bytes */ -- 2.9.0

6 years, 11 months

[PATCH] aacraid: stop using deprated get_seconds()

by Arnd Bergmann

get_seconds() can overflow on 32-bit architectures and is deprecated because of that. The use in the aacraid driver has the same problem due to a limited firmware interface, it also overflows in the year 2106. This changes all calls to get_seconds() to the non-deprecated ktime_get_real_seconds(), which unfortunately doesn't solve that problem but gets rid of one user of the deprecated interface. Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> --- drivers/scsi/aacraid/rx.c | 2 +- drivers/scsi/aacraid/sa.c | 2 +- drivers/scsi/aacraid/src.c | 4 ++-- 3 files changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/scsi/aacraid/rx.c b/drivers/scsi/aacraid/rx.c index 620166694171..576cdf9cc120 100644 --- a/drivers/scsi/aacraid/rx.c +++ b/drivers/scsi/aacraid/rx.c @@ -319,7 +319,7 @@ static void aac_rx_start_adapter(struct aac_dev *dev) union aac_init *init; init = dev->init; - init->r7.host_elapsed_seconds = cpu_to_le32(get_seconds()); + init->r7.host_elapsed_seconds = cpu_to_le32(ktime_get_real_seconds()); // We can only use a 32 bit address here rx_sync_cmd(dev, INIT_STRUCT_BASE_ADDRESS, (u32)(ulong)dev->init_pa, 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL, NULL); diff --git a/drivers/scsi/aacraid/sa.c b/drivers/scsi/aacraid/sa.c index 882f40353b96..efa96c1c6aa3 100644 --- a/drivers/scsi/aacraid/sa.c +++ b/drivers/scsi/aacraid/sa.c @@ -251,7 +251,7 @@ static void aac_sa_start_adapter(struct aac_dev *dev) * Fill in the remaining pieces of the init. */ init = dev->init; - init->r7.host_elapsed_seconds = cpu_to_le32(get_seconds()); + init->r7.host_elapsed_seconds = cpu_to_le32(ktime_get_real_seconds()); /* We can only use a 32 bit address here */ sa_sync_cmd(dev, INIT_STRUCT_BASE_ADDRESS, (u32)(ulong)dev->init_pa, 0, 0, 0, 0, 0, diff --git a/drivers/scsi/aacraid/src.c b/drivers/scsi/aacraid/src.c index 4ebb35a29caa..5a299975a289 100644 --- a/drivers/scsi/aacraid/src.c +++ b/drivers/scsi/aacraid/src.c @@ -409,7 +409,7 @@ static void aac_src_start_adapter(struct aac_dev *dev) init = dev->init; if (dev->comm_interface == AAC_COMM_MESSAGE_TYPE3) { - init->r8.host_elapsed_seconds = cpu_to_le32(get_seconds()); + init->r8.host_elapsed_seconds = cpu_to_le32(ktime_get_real_seconds()); src_sync_cmd(dev, INIT_STRUCT_BASE_ADDRESS, lower_32_bits(dev->init_pa), upper_32_bits(dev->init_pa), @@ -417,7 +417,7 @@ static void aac_src_start_adapter(struct aac_dev *dev) (AAC_MAX_HRRQ - 1) * sizeof(struct _rrq), 0, 0, 0, NULL, NULL, NULL, NULL, NULL); } else { - init->r7.host_elapsed_seconds = cpu_to_le32(get_seconds()); + init->r7.host_elapsed_seconds = cpu_to_le32(ktime_get_real_seconds()); // We can only use a 32 bit address here src_sync_cmd(dev, INIT_STRUCT_BASE_ADDRESS, (u32)(ulong)dev->init_pa, 0, 0, 0, 0, 0, -- 2.9.0

6 years, 11 months

[PATCH v2 1/2] y2038: rusage: Use __kernel_old_timeval for process times

by Arnd Bergmann

'struct rusage' contains the run times of a process in 'timeval' format and is accessed through the wait4() and getrusage() system calls. This is not a problem for y2038 safety by itself, but causes an issue when the C library starts using 64-bit time_t on 32-bit architectures because the structure layout becomes incompatible. There are three possible ways of dealing with this: a) deprecate the wait4() and getrusage() system calls, and create a set of kernel interfaces based around a newly defined structure that could solve multiple problems at once, e.g. provide more fine-grained timestamps. The C library could then implement the posix interfaces on top of the new system calls. b) Extend the approach taken by the x32 ABI, and use the 64-bit native structure layout for rusage on all architectures with new system calls that is otherwise compatible. A downside of this is that it requires a number of ugly hacks to deal with all the other fields of the structure also becoming 64 bit wide. Especially on big-endian architectures, we can't easily use the union trick from glibc. c) Change the definition of struct rusage to be independent of time_t. This is the easiest change, as it does not involve new system call entry points, but it requires the C library to convert between the kernel format of the structure and the user space definition. d) Add a new ABI variant of 'struct rusage' that corresponds to the current layout with 32-bit counters but 64-bit time_t. This would minimize the libc changes but require additional kernel code to handle a third binary layout on 64-bit kernels. I'm picking approach c) for its simplicity. As pointed out by reviewers, simply using the kernel structure in user space would not be POSIX compliant, but I have verified that none of the usual C libraries (glibc, musl, uclibc-ng, newlib) do that. Instead, they all provide their own definition of 'struct rusage' to applications in sys/resource.h. To be on the safe side, I'm only changing the definition inside of the kernel and for user space with an updated 'time_t'. All existing users will see the traditional layout that is compatible with what the C libraries export. A 32-bit application that includes linux/resource.h but uses an update C library with 64-bit time_t will now see the low-level kernel structure that corresponds to the getrusage() system call interface but that will be different from one defined in sys/resource.h for the getrusage library interface. Link: https://patchwork.kernel.org/patch/10077527/ Cc: Paul Eggert <eggert(a)cs.ucla.edu> Cc: Eric W. Biederman <ebiederm(a)xmission.com> Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> --- arch/alpha/kernel/osf_sys.c | 15 +++++++++------ include/uapi/linux/resource.h | 14 ++++++++++++-- kernel/sys.c | 4 ++-- 3 files changed, 23 insertions(+), 10 deletions(-) diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c index 89faa6f4de47..cad03ee445b3 100644 --- a/arch/alpha/kernel/osf_sys.c +++ b/arch/alpha/kernel/osf_sys.c @@ -1184,6 +1184,7 @@ SYSCALL_DEFINE4(osf_wait4, pid_t, pid, int __user *, ustatus, int, options, struct rusage32 __user *, ur) { unsigned int status = 0; + struct rusage32 r32; struct rusage r; long err = kernel_wait4(pid, &status, options, &r); if (err <= 0) @@ -1192,12 +1193,14 @@ SYSCALL_DEFINE4(osf_wait4, pid_t, pid, int __user *, ustatus, int, options, return -EFAULT; if (!ur) return err; - if (put_tv_to_tv32(&ur->ru_utime, &r.ru_utime)) - return -EFAULT; - if (put_tv_to_tv32(&ur->ru_stime, &r.ru_stime)) - return -EFAULT; - if (copy_to_user(&ur->ru_maxrss, &r.ru_maxrss, - sizeof(struct rusage32) - offsetof(struct rusage32, ru_maxrss))) + r32.ru_utime.tv_sec = r.ru_utime.tv_sec; + r32.ru_utime.tv_usec = r.ru_utime.tv_usec; + r32.ru_stime.tv_sec = r.ru_stime.tv_sec; + r32.ru_stime.tv_usec = r.ru_stime.tv_usec; + memcpy(&r32.ru_maxrss, &r.ru_maxrss, + sizeof(struct rusage32) - offsetof(struct rusage32, ru_maxrss)); + + if (copy_to_user(ur, &r32, sizeof(r32))) return -EFAULT; return err; } diff --git a/include/uapi/linux/resource.h b/include/uapi/linux/resource.h index cc00fd079631..611d3745c70a 100644 --- a/include/uapi/linux/resource.h +++ b/include/uapi/linux/resource.h @@ -22,8 +22,18 @@ #define RUSAGE_THREAD 1 /* only the calling thread */ struct rusage { - struct timeval ru_utime; /* user time used */ - struct timeval ru_stime; /* system time used */ +#if (__BITS_PER_LONG != 32 || !defined(__USE_TIME_BITS64)) && !defined(__KERNEL__) + struct timeval ru_utime; /* user time used */ + struct timeval ru_stime; /* system time used */ +#else + /* + * For 32-bit user space with 64-bit time_t, the binary layout + * in these fields is incompatible with 'struct timeval', so the + * C library has to translate this into the POSIX compatible layout. + */ + struct __kernel_old_timeval ru_utime; + struct __kernel_old_timeval ru_stime; +#endif __kernel_long_t ru_maxrss; /* maximum resident set size */ __kernel_long_t ru_ixrss; /* integral shared memory size */ __kernel_long_t ru_idrss; /* integral unshared data size */ diff --git a/kernel/sys.c b/kernel/sys.c index ad692183dfe9..1de538f622e8 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -1769,8 +1769,8 @@ void getrusage(struct task_struct *p, int who, struct rusage *r) unlock_task_sighand(p, &flags); out: - r->ru_utime = ns_to_timeval(utime); - r->ru_stime = ns_to_timeval(stime); + r->ru_utime = ns_to_kernel_old_timeval(utime); + r->ru_stime = ns_to_kernel_old_timeval(stime); if (who != RUSAGE_CHILDREN) { struct mm_struct *mm = get_task_mm(p); -- 2.9.0

6 years, 11 months

[PATCH] iio: use timespec64 based interfaces for iio_get_time_ns()

by Arnd Bergmann

We have replacements for all the deprecated timespec based interfaces now, so this can finally convert iio_get_time_ns() to consistently use the nanosecond or timespec64 based interfaces instead, avoiding the y2038 overflow. Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> --- drivers/iio/industrialio-core.c | 26 +++++++++----------------- 1 file changed, 9 insertions(+), 17 deletions(-) diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c index 19bdf3d2962a..fcbe92c34a3d 100644 --- a/drivers/iio/industrialio-core.c +++ b/drivers/iio/industrialio-core.c @@ -207,35 +207,27 @@ static int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id) */ s64 iio_get_time_ns(const struct iio_dev *indio_dev) { - struct timespec tp; + struct timespec64 tp; switch (iio_device_get_clock(indio_dev)) { case CLOCK_REALTIME: - ktime_get_real_ts(&tp); - break; + return ktime_get_real_ns(); case CLOCK_MONOTONIC: - ktime_get_ts(&tp); - break; + return ktime_get_ns(); case CLOCK_MONOTONIC_RAW: - getrawmonotonic(&tp); - break; + return ktime_get_raw_ns(); case CLOCK_REALTIME_COARSE: - tp = current_kernel_time(); - break; + return ktime_to_ns(ktime_get_coarse_real()); case CLOCK_MONOTONIC_COARSE: - tp = get_monotonic_coarse(); - break; + ktime_get_coarse_ts64(&tp); + return timespec64_to_ns(&tp); case CLOCK_BOOTTIME: - get_monotonic_boottime(&tp); - break; + return ktime_get_boot_ns(); case CLOCK_TAI: - timekeeping_clocktai(&tp); - break; + return ktime_get_tai_ns(); default: BUG(); } - - return timespec_to_ns(&tp); } EXPORT_SYMBOL(iio_get_time_ns); -- 2.9.0

6 years, 11 months

[merged] sysinfo-remove-get_monotonic_boottime.patch removed from -mm tree

by akpm＠linux-foundation.org

The patch titled Subject: kernel/sys.c: remove get_monotonic_boottime() has been removed from the -mm tree. Its filename was sysinfo-remove-get_monotonic_boottime.patch This patch was dropped because it was merged into mainline or a subsystem tree ------------------------------------------------------ From: Arnd Bergmann <arnd(a)arndb.de> Subject: kernel/sys.c: remove get_monotonic_boottime() get_monotonic_boottime() is deprecated because it uses the old 'timespec' structure. This replaces one of the last callers with a call to ktime_get_boottime. Link: http://lkml.kernel.org/r/20180618150114.849216-1-arnd@arndb.de Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> Reviewed-by: Cyrill Gorcunov <gorcunov(a)gmail.com> Reviewed-by: Andrew Morton <akpm(a)linux-foundation.org> Cc: Thomas Gleixner <tglx(a)linutronix.de> Cc: <y2038(a)lists.linaro.org> Cc: Dominik Brodowski <linux(a)dominikbrodowski.net> Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> --- kernel/sys.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff -puN kernel/sys.c~sysinfo-remove-get_monotonic_boottime kernel/sys.c --- a/kernel/sys.c~sysinfo-remove-get_monotonic_boottime +++ a/kernel/sys.c @@ -2523,11 +2523,11 @@ static int do_sysinfo(struct sysinfo *in { unsigned long mem_total, sav_total; unsigned int mem_unit, bitcount; - struct timespec tp; + struct timespec64 tp; memset(info, 0, sizeof(struct sysinfo)); - get_monotonic_boottime(&tp); + ktime_get_boottime_ts64(&tp); info->uptime = tp.tv_sec + (tp.tv_nsec ? 1 : 0); get_avenrun(info->loads, 0, SI_LOAD_SHIFT - FSHIFT); _ Patches currently in -mm which might be from arnd(a)arndb.de are ocfs2-dlmglue-clean-up-timestamp-handling.patch shmem-use-monotonic-time-for-i_generation.patch procfs-uptime-use-ktime_get_boottime_ts64.patch crash-print-timestamp-using-time64_t.patch nilfs2-use-64-bit-superblock-timstamps.patch reiserfs-remove-unused-j_timestamp.patch reiserfs-use-monotonic-time-for-j_trans_start_time.patch reiserfs-remove-obsolete-print_time-function.patch fat-propagate-64-bit-inode-timestamps.patch adfs-use-timespec64-for-time-conversion.patch vmcore-hide-vmcoredd_mmap_dumps-for-nommu-builds.patch

6 years, 12 months

[PATCH] [v3] reiserfs: change j_timestamp type to time64_t

by Arnd Bergmann

This uses the deprecated time_t type but is write-only, and could be removed, but as Jeff explains, having a timestamp can be usefule for post-mortem analysis in crash dumps. In order to remove one of the last instances of time_t, this changes the type to time64_t, same as j_trans_start_time. Cc: Jan Kara <jack(a)suse.cz> Cc: Jeff Mahoney <jeffm(a)suse.com> Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> --- This could replace "reiserfs: remove unused j_timestamp" if we decide that we want to keep that variable. Posting this patch as an alternative now, while waiting for Jeff to reply on how important this really is. --- fs/reiserfs/reiserfs.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/reiserfs/reiserfs.h b/fs/reiserfs/reiserfs.h index 621b9a07080a..e5ca9ed79e54 100644 --- a/fs/reiserfs/reiserfs.h +++ b/fs/reiserfs/reiserfs.h @@ -271,7 +271,7 @@ struct reiserfs_journal_list { struct mutex j_commit_mutex; unsigned int j_trans_id; - time_t j_timestamp; + time64_t j_timestamp; /* write-only but useful for crash dump analysis */ struct reiserfs_list_bitmap *j_list_bitmap; struct buffer_head *j_commit_bh; /* commit buffer head */ struct reiserfs_journal_cnode *j_realblock; -- 2.9.0

6 years, 12 months

[PATCH] staging: android/vsoc: stop using 'timespec'

by Arnd Bergmann

The timespec structure suffers from the y2038 overflow and should not be used. This changes handle_vsoc_cond_wait() to use ktime_t directly. Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> --- drivers/staging/android/vsoc.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/drivers/staging/android/vsoc.c b/drivers/staging/android/vsoc.c index 806beda1040b..22571abcaa4e 100644 --- a/drivers/staging/android/vsoc.c +++ b/drivers/staging/android/vsoc.c @@ -405,7 +405,7 @@ static int handle_vsoc_cond_wait(struct file *filp, struct vsoc_cond_wait *arg) int ret = 0; struct vsoc_device_region *region_p = vsoc_region_from_filep(filp); atomic_t *address = NULL; - struct timespec ts; + ktime_t wake_time; /* Ensure that the offset is aligned */ if (arg->offset & (sizeof(uint32_t) - 1)) @@ -433,14 +433,13 @@ static int handle_vsoc_cond_wait(struct file *filp, struct vsoc_cond_wait *arg) * We do things this way to flatten differences between 32 bit * and 64 bit timespecs. */ - ts.tv_sec = arg->wake_time_sec; - ts.tv_nsec = arg->wake_time_nsec; - - if (!timespec_valid(&ts)) + if (arg->wake_time_nsec >= NSEC_PER_SEC) return -EINVAL; + wake_time = ktime_set(arg->wake_time_sec, arg->wake_time_nsec); + hrtimer_init_on_stack(&to->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); - hrtimer_set_expires_range_ns(&to->timer, timespec_to_ktime(ts), + hrtimer_set_expires_range_ns(&to->timer, wake_time, current->timer_slack_ns); hrtimer_init_sleeper(to, current); -- 2.9.0

6 years, 12 months

[PATCH 1/6] ext4: sysfs: print ext4_super_block fields as little-endian

by Arnd Bergmann

While working on extended rand for last_error/first_error timestamps, I noticed that the endianess is wrong, we access the little-endian fields in struct ext4_super_block as native-endian when we print them. This adds a special case in ext4_attr_show() and ext4_attr_store() to byteswap the superblock fields if needed. In older kernels, this code was part of super.c, it got moved to sysfs.c in linux-4.4. Cc: stable(a)vger.kernel.org Fixes: 52c198c6820f ("ext4: add sysfs entry showing whether the fs contains errors") Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> --- fs/ext4/sysfs.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c index f34da0bb8f17..b970a200f20c 100644 --- a/fs/ext4/sysfs.c +++ b/fs/ext4/sysfs.c @@ -274,8 +274,12 @@ static ssize_t ext4_attr_show(struct kobject *kobj, case attr_pointer_ui: if (!ptr) return 0; - return snprintf(buf, PAGE_SIZE, "%u\n", - *((unsigned int *) ptr)); + if (a->attr_ptr == ptr_ext4_super_block_offset) + return snprintf(buf, PAGE_SIZE, "%u\n", + le32_to_cpup(ptr)); + else + return snprintf(buf, PAGE_SIZE, "%u\n", + *((unsigned int *) ptr)); case attr_pointer_atomic: if (!ptr) return 0; @@ -308,7 +312,10 @@ static ssize_t ext4_attr_store(struct kobject *kobj, ret = kstrtoul(skip_spaces(buf), 0, &t); if (ret) return ret; - *((unsigned int *) ptr) = t; + if (a->attr_ptr == ptr_ext4_super_block_offset) + *((__le32 *) ptr) = cpu_to_le32(t); + else + *((unsigned int *) ptr) = t; return len; case attr_inode_readahead: return inode_readahead_blks_store(sbi, buf, len); -- 2.9.0

6 years, 12 months

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