January 2018 - Linux-stable-mirror

[Linux-stable-mirror] Patch "mm/compaction: pass only pageblock aligned range to pageblock_pfn_to_page" has been added to the 4.4-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled mm/compaction: pass only pageblock aligned range to pageblock_pfn_to_page to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: mm-compaction-pass-only-pageblock-aligned-range-to-pageblock_pfn_to_page.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From e1409c325fdc1fef7b3d8025c51892355f065d15 Mon Sep 17 00:00:00 2001 From: Joonsoo Kim <iamjoonsoo.kim(a)lge.com> Date: Tue, 15 Mar 2016 14:57:48 -0700 Subject: mm/compaction: pass only pageblock aligned range to pageblock_pfn_to_page From: Joonsoo Kim <iamjoonsoo.kim(a)lge.com> commit e1409c325fdc1fef7b3d8025c51892355f065d15 upstream. pageblock_pfn_to_page() is used to check there is valid pfn and all pages in the pageblock is in a single zone. If there is a hole in the pageblock, passing arbitrary position to pageblock_pfn_to_page() could cause to skip whole pageblock scanning, instead of just skipping the hole page. For deterministic behaviour, it's better to always pass pageblock aligned range to pageblock_pfn_to_page(). It will also help further optimization on pageblock_pfn_to_page() in the following patch. Signed-off-by: Joonsoo Kim <iamjoonsoo.kim(a)lge.com> Cc: Aaron Lu <aaron.lu(a)intel.com> Cc: David Rientjes <rientjes(a)google.com> Cc: Mel Gorman <mgorman(a)suse.de> Cc: Rik van Riel <riel(a)redhat.com> Acked-by: Vlastimil Babka <vbabka(a)suse.cz> Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds(a)linux-foundation.org> Signed-off-by: Mel Gorman <mgorman(a)suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- mm/compaction.c | 41 ++++++++++++++++++++++++++++++----------- 1 file changed, 30 insertions(+), 11 deletions(-) --- a/mm/compaction.c +++ b/mm/compaction.c @@ -553,13 +553,17 @@ unsigned long isolate_freepages_range(struct compact_control *cc, unsigned long start_pfn, unsigned long end_pfn) { - unsigned long isolated, pfn, block_end_pfn; + unsigned long isolated, pfn, block_start_pfn, block_end_pfn; LIST_HEAD(freelist); pfn = start_pfn; + block_start_pfn = pfn & ~(pageblock_nr_pages - 1); + if (block_start_pfn < cc->zone->zone_start_pfn) + block_start_pfn = cc->zone->zone_start_pfn; block_end_pfn = ALIGN(pfn + 1, pageblock_nr_pages); for (; pfn < end_pfn; pfn += isolated, + block_start_pfn = block_end_pfn, block_end_pfn += pageblock_nr_pages) { /* Protect pfn from changing by isolate_freepages_block */ unsigned long isolate_start_pfn = pfn; @@ -572,11 +576,13 @@ isolate_freepages_range(struct compact_c * scanning range to right one. */ if (pfn >= block_end_pfn) { + block_start_pfn = pfn & ~(pageblock_nr_pages - 1); block_end_pfn = ALIGN(pfn + 1, pageblock_nr_pages); block_end_pfn = min(block_end_pfn, end_pfn); } - if (!pageblock_pfn_to_page(pfn, block_end_pfn, cc->zone)) + if (!pageblock_pfn_to_page(block_start_pfn, + block_end_pfn, cc->zone)) break; isolated = isolate_freepages_block(cc, &isolate_start_pfn, @@ -862,18 +868,23 @@ unsigned long isolate_migratepages_range(struct compact_control *cc, unsigned long start_pfn, unsigned long end_pfn) { - unsigned long pfn, block_end_pfn; + unsigned long pfn, block_start_pfn, block_end_pfn; /* Scan block by block. First and last block may be incomplete */ pfn = start_pfn; + block_start_pfn = pfn & ~(pageblock_nr_pages - 1); + if (block_start_pfn < cc->zone->zone_start_pfn) + block_start_pfn = cc->zone->zone_start_pfn; block_end_pfn = ALIGN(pfn + 1, pageblock_nr_pages); for (; pfn < end_pfn; pfn = block_end_pfn, + block_start_pfn = block_end_pfn, block_end_pfn += pageblock_nr_pages) { block_end_pfn = min(block_end_pfn, end_pfn); - if (!pageblock_pfn_to_page(pfn, block_end_pfn, cc->zone)) + if (!pageblock_pfn_to_page(block_start_pfn, + block_end_pfn, cc->zone)) continue; pfn = isolate_migratepages_block(cc, pfn, block_end_pfn, @@ -1091,7 +1102,9 @@ int sysctl_compact_unevictable_allowed _ static isolate_migrate_t isolate_migratepages(struct zone *zone, struct compact_control *cc) { - unsigned long low_pfn, end_pfn; + unsigned long block_start_pfn; + unsigned long block_end_pfn; + unsigned long low_pfn; unsigned long isolate_start_pfn; struct page *page; const isolate_mode_t isolate_mode = @@ -1103,16 +1116,21 @@ static isolate_migrate_t isolate_migrate * initialized by compact_zone() */ low_pfn = cc->migrate_pfn; + block_start_pfn = cc->migrate_pfn & ~(pageblock_nr_pages - 1); + if (block_start_pfn < zone->zone_start_pfn) + block_start_pfn = zone->zone_start_pfn; /* Only scan within a pageblock boundary */ - end_pfn = ALIGN(low_pfn + 1, pageblock_nr_pages); + block_end_pfn = ALIGN(low_pfn + 1, pageblock_nr_pages); /* * Iterate over whole pageblocks until we find the first suitable. * Do not cross the free scanner. */ - for (; end_pfn <= cc->free_pfn; - low_pfn = end_pfn, end_pfn += pageblock_nr_pages) { + for (; block_end_pfn <= cc->free_pfn; + low_pfn = block_end_pfn, + block_start_pfn = block_end_pfn, + block_end_pfn += pageblock_nr_pages) { /* * This can potentially iterate a massively long zone with @@ -1123,7 +1141,8 @@ static isolate_migrate_t isolate_migrate && compact_should_abort(cc)) break; - page = pageblock_pfn_to_page(low_pfn, end_pfn, zone); + page = pageblock_pfn_to_page(block_start_pfn, block_end_pfn, + zone); if (!page) continue; @@ -1142,8 +1161,8 @@ static isolate_migrate_t isolate_migrate /* Perform the isolation */ isolate_start_pfn = low_pfn; - low_pfn = isolate_migratepages_block(cc, low_pfn, end_pfn, - isolate_mode); + low_pfn = isolate_migratepages_block(cc, low_pfn, + block_end_pfn, isolate_mode); if (!low_pfn || cc->contended) { acct_isolated(zone, cc); Patches currently in stable-queue which might be from iamjoonsoo.kim(a)lge.com are queue-4.4/mm-compaction-pass-only-pageblock-aligned-range-to-pageblock_pfn_to_page.patch queue-4.4/mm-compaction-fix-invalid-free_pfn-and-compact_cached_free_pfn.patch

7 years, 4 months

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[Linux-stable-mirror] Patch "mm/page-writeback: fix dirty_ratelimit calculation" has been added to the 4.4-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled mm/page-writeback: fix dirty_ratelimit calculation to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: mm-page-writeback-fix-dirty_ratelimit-calculation.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From d59b1087a98e402ed9a7cc577f4da435f9a555f5 Mon Sep 17 00:00:00 2001 From: Andrey Ryabinin <aryabinin(a)virtuozzo.com> Date: Tue, 15 Mar 2016 14:55:27 -0700 Subject: mm/page-writeback: fix dirty_ratelimit calculation From: Andrey Ryabinin <aryabinin(a)virtuozzo.com> commit d59b1087a98e402ed9a7cc577f4da435f9a555f5 upstream. Calculation of dirty_ratelimit sometimes is not correct. E.g. initial values of dirty_ratelimit == INIT_BW and step == 0, lead to the following result: UBSAN: Undefined behaviour in ../mm/page-writeback.c:1286:7 shift exponent 25600 is too large for 64-bit type 'long unsigned int' The fix is straightforward - make step 0 if the shift exponent is too big. Signed-off-by: Andrey Ryabinin <aryabinin(a)virtuozzo.com> Cc: Wu Fengguang <fengguang.wu(a)intel.com> Cc: Tejun Heo <tj(a)kernel.org> Cc: Andy Shevchenko <andy.shevchenko(a)gmail.com> Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds(a)linux-foundation.org> Signed-off-by: Mel Gorman <mgorman(a)suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- mm/page-writeback.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -1162,6 +1162,7 @@ static void wb_update_dirty_ratelimit(st unsigned long balanced_dirty_ratelimit; unsigned long step; unsigned long x; + unsigned long shift; /* * The dirty rate will match the writeout rate in long term, except @@ -1286,11 +1287,11 @@ static void wb_update_dirty_ratelimit(st * rate itself is constantly fluctuating. So decrease the track speed * when it gets close to the target. Helps eliminate pointless tremors. */ - step >>= dirty_ratelimit / (2 * step + 1); - /* - * Limit the tracking speed to avoid overshooting. - */ - step = (step + 7) / 8; + shift = dirty_ratelimit / (2 * step + 1); + if (shift < BITS_PER_LONG) + step = DIV_ROUND_UP(step >> shift, 8); + else + step = 0; if (dirty_ratelimit < balanced_dirty_ratelimit) dirty_ratelimit += step; Patches currently in stable-queue which might be from aryabinin(a)virtuozzo.com are queue-4.4/net-mac80211-debugfs.c-prevent-build-failure-with-config_ubsan-y.patch queue-4.4/mm-page-writeback-fix-dirty_ratelimit-calculation.patch

7 years, 4 months

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[Linux-stable-mirror] Patch "locks: don't check for race with close when setting OFD lock" has been added to the 4.4-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled locks: don't check for race with close when setting OFD lock to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: locks-don-t-check-for-race-with-close-when-setting-ofd-lock.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From 0752ba807b04ccd69cb4bc8bbf829a80ee208a3c Mon Sep 17 00:00:00 2001 From: Jeff Layton <jeff.layton(a)primarydata.com> Date: Fri, 8 Jan 2016 07:30:43 -0500 Subject: locks: don't check for race with close when setting OFD lock From: Jeff Layton <jeff.layton(a)primarydata.com> commit 0752ba807b04ccd69cb4bc8bbf829a80ee208a3c upstream. We don't clean out OFD locks on close(), so there's no need to check for a race with them here. They'll get cleaned out at the same time that flock locks are. Signed-off-by: Jeff Layton <jeff.layton(a)primarydata.com> Acked-by: "J. Bruce Fields" <bfields(a)fieldses.org> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Signed-off-by: Mel Gorman <mgorman(a)suse.de> --- fs/locks.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) --- a/fs/locks.c +++ b/fs/locks.c @@ -2220,10 +2220,12 @@ int fcntl_setlk(unsigned int fd, struct error = do_lock_file_wait(filp, cmd, file_lock); /* - * Attempt to detect a close/fcntl race and recover by - * releasing the lock that was just acquired. + * Attempt to detect a close/fcntl race and recover by releasing the + * lock that was just acquired. There is no need to do that when we're + * unlocking though, or for OFD locks. */ - if (!error && file_lock->fl_type != F_UNLCK) { + if (!error && file_lock->fl_type != F_UNLCK && + !(file_lock->fl_flags & FL_OFDLCK)) { /* * We need that spin_lock here - it prevents reordering between * update of i_flctx->flc_posix and check for it done in @@ -2362,10 +2364,12 @@ int fcntl_setlk64(unsigned int fd, struc error = do_lock_file_wait(filp, cmd, file_lock); /* - * Attempt to detect a close/fcntl race and recover by - * releasing the lock that was just acquired. + * Attempt to detect a close/fcntl race and recover by releasing the + * lock that was just acquired. There is no need to do that when we're + * unlocking though, or for OFD locks. */ - if (!error && file_lock->fl_type != F_UNLCK) { + if (!error && file_lock->fl_type != F_UNLCK && + !(file_lock->fl_flags & FL_OFDLCK)) { /* * We need that spin_lock here - it prevents reordering between * update of i_flctx->flc_posix and check for it done in Patches currently in stable-queue which might be from jeff.layton(a)primarydata.com are queue-4.4/locks-don-t-check-for-race-with-close-when-setting-ofd-lock.patch

7 years, 4 months

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[Linux-stable-mirror] Patch "mm/compaction: fix invalid free_pfn and compact_cached_free_pfn" has been added to the 4.4-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled mm/compaction: fix invalid free_pfn and compact_cached_free_pfn to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: mm-compaction-fix-invalid-free_pfn-and-compact_cached_free_pfn.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From 623446e4dc45b37740268165107cc63abb3022f0 Mon Sep 17 00:00:00 2001 From: Joonsoo Kim <iamjoonsoo.kim(a)lge.com> Date: Tue, 15 Mar 2016 14:57:45 -0700 Subject: mm/compaction: fix invalid free_pfn and compact_cached_free_pfn From: Joonsoo Kim <iamjoonsoo.kim(a)lge.com> commit 623446e4dc45b37740268165107cc63abb3022f0 upstream. free_pfn and compact_cached_free_pfn are the pointer that remember restart position of freepage scanner. When they are reset or invalid, we set them to zone_end_pfn because freepage scanner works in reverse direction. But, because zone range is defined as [zone_start_pfn, zone_end_pfn), zone_end_pfn is invalid to access. Therefore, we should not store it to free_pfn and compact_cached_free_pfn. Instead, we need to store zone_end_pfn - 1 to them. There is one more thing we should consider. Freepage scanner scan reversely by pageblock unit. If free_pfn and compact_cached_free_pfn are set to middle of pageblock, it regards that sitiation as that it already scans front part of pageblock so we lose opportunity to scan there. To fix-up, this patch do round_down() to guarantee that reset position will be pageblock aligned. Note that thanks to the current pageblock_pfn_to_page() implementation, actual access to zone_end_pfn doesn't happen until now. But, following patch will change pageblock_pfn_to_page() so this patch is needed from now on. Signed-off-by: Joonsoo Kim <iamjoonsoo.kim(a)lge.com> Acked-by: David Rientjes <rientjes(a)google.com> Acked-by: Vlastimil Babka <vbabka(a)suse.cz> Cc: Aaron Lu <aaron.lu(a)intel.com> Cc: Mel Gorman <mgorman(a)suse.de> Cc: Rik van Riel <riel(a)redhat.com> Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds(a)linux-foundation.org> Signed-off-by: Mel Gorman <mgorman(a)suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- mm/compaction.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) --- a/mm/compaction.c +++ b/mm/compaction.c @@ -200,7 +200,8 @@ static void reset_cached_positions(struc { zone->compact_cached_migrate_pfn[0] = zone->zone_start_pfn; zone->compact_cached_migrate_pfn[1] = zone->zone_start_pfn; - zone->compact_cached_free_pfn = zone_end_pfn(zone); + zone->compact_cached_free_pfn = + round_down(zone_end_pfn(zone) - 1, pageblock_nr_pages); } /* @@ -1358,11 +1359,11 @@ static int compact_zone(struct zone *zon */ cc->migrate_pfn = zone->compact_cached_migrate_pfn[sync]; cc->free_pfn = zone->compact_cached_free_pfn; - if (cc->free_pfn < start_pfn || cc->free_pfn > end_pfn) { - cc->free_pfn = end_pfn & ~(pageblock_nr_pages-1); + if (cc->free_pfn < start_pfn || cc->free_pfn >= end_pfn) { + cc->free_pfn = round_down(end_pfn - 1, pageblock_nr_pages); zone->compact_cached_free_pfn = cc->free_pfn; } - if (cc->migrate_pfn < start_pfn || cc->migrate_pfn > end_pfn) { + if (cc->migrate_pfn < start_pfn || cc->migrate_pfn >= end_pfn) { cc->migrate_pfn = start_pfn; zone->compact_cached_migrate_pfn[0] = cc->migrate_pfn; zone->compact_cached_migrate_pfn[1] = cc->migrate_pfn; Patches currently in stable-queue which might be from iamjoonsoo.kim(a)lge.com are queue-4.4/mm-compaction-pass-only-pageblock-aligned-range-to-pageblock_pfn_to_page.patch queue-4.4/mm-compaction-fix-invalid-free_pfn-and-compact_cached_free_pfn.patch

7 years, 4 months

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[Linux-stable-mirror] Patch "locking/mutex: Allow next waiter lockless wakeup" has been added to the 4.4-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled locking/mutex: Allow next waiter lockless wakeup to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: locking-mutex-allow-next-waiter-lockless-wakeup.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From 1329ce6fbbe4536592dfcfc8d64d61bfeb598fe6 Mon Sep 17 00:00:00 2001 From: Davidlohr Bueso <dave(a)stgolabs.net> Date: Sun, 24 Jan 2016 18:23:43 -0800 Subject: locking/mutex: Allow next waiter lockless wakeup From: Davidlohr Bueso <dave(a)stgolabs.net> commit 1329ce6fbbe4536592dfcfc8d64d61bfeb598fe6 upstream. Make use of wake-queues and enable the wakeup to occur after releasing the wait_lock. This is similar to what we do with rtmutex top waiter, slightly shortening the critical region and allow other waiters to acquire the wait_lock sooner. In low contention cases it can also help the recently woken waiter to find the wait_lock available (fastpath) when it continues execution. Reviewed-by: Waiman Long <Waiman.Long(a)hpe.com> Signed-off-by: Davidlohr Bueso <dbueso(a)suse.de> Signed-off-by: Peter Zijlstra (Intel) <peterz(a)infradead.org> Cc: Andrew Morton <akpm(a)linux-foundation.org> Cc: Ding Tianhong <dingtianhong(a)huawei.com> Cc: Jason Low <jason.low2(a)hp.com> Cc: Linus Torvalds <torvalds(a)linux-foundation.org> Cc: Paul E. McKenney <paulmck(a)linux.vnet.ibm.com> Cc: Paul E. McKenney <paulmck(a)us.ibm.com> Cc: Peter Zijlstra <peterz(a)infradead.org> Cc: Thomas Gleixner <tglx(a)linutronix.de> Cc: Tim Chen <tim.c.chen(a)linux.intel.com> Cc: Waiman Long <waiman.long(a)hpe.com> Cc: Will Deacon <Will.Deacon(a)arm.com> Link: http://lkml.kernel.org/r/20160125022343.GA3322@linux-uzut.site Signed-off-by: Ingo Molnar <mingo(a)kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- kernel/locking/mutex.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) --- a/kernel/locking/mutex.c +++ b/kernel/locking/mutex.c @@ -719,6 +719,7 @@ static inline void __mutex_unlock_common_slowpath(struct mutex *lock, int nested) { unsigned long flags; + WAKE_Q(wake_q); /* * As a performance measurement, release the lock before doing other @@ -746,11 +747,11 @@ __mutex_unlock_common_slowpath(struct mu struct mutex_waiter, list); debug_mutex_wake_waiter(lock, waiter); - - wake_up_process(waiter->task); + wake_q_add(&wake_q, waiter->task); } spin_unlock_mutex(&lock->wait_lock, flags); + wake_up_q(&wake_q); } /* Patches currently in stable-queue which might be from dave(a)stgolabs.net are queue-4.4/locking-mutex-allow-next-waiter-lockless-wakeup.patch queue-4.4/futex-replace-barrier-in-unqueue_me-with-read_once.patch

7 years, 4 months

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[Linux-stable-mirror] Patch "futex: Replace barrier() in unqueue_me() with READ_ONCE()" has been added to the 4.4-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled futex: Replace barrier() in unqueue_me() with READ_ONCE() to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: futex-replace-barrier-in-unqueue_me-with-read_once.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From 29b75eb2d56a714190a93d7be4525e617591077a Mon Sep 17 00:00:00 2001 From: Jianyu Zhan <nasa4836(a)gmail.com> Date: Mon, 7 Mar 2016 09:32:24 +0800 Subject: futex: Replace barrier() in unqueue_me() with READ_ONCE() From: Jianyu Zhan <nasa4836(a)gmail.com> commit 29b75eb2d56a714190a93d7be4525e617591077a upstream. Commit e91467ecd1ef ("bug in futex unqueue_me") introduced a barrier() in unqueue_me() to prevent the compiler from rereading the lock pointer which might change after a check for NULL. Replace the barrier() with a READ_ONCE() for the following reasons: 1) READ_ONCE() is a weaker form of barrier() that affects only the specific load operation, while barrier() is a general compiler level memory barrier. READ_ONCE() was not available at the time when the barrier was added. 2) Aside of that READ_ONCE() is descriptive and self explainatory while a barrier without comment is not clear to the casual reader. No functional change. [ tglx: Massaged changelog ] Signed-off-by: Jianyu Zhan <nasa4836(a)gmail.com> Acked-by: Christian Borntraeger <borntraeger(a)de.ibm.com> Acked-by: Darren Hart <dvhart(a)linux.intel.com> Cc: dave(a)stgolabs.net Cc: peterz(a)infradead.org Cc: linux(a)rasmusvillemoes.dk Cc: akpm(a)linux-foundation.org Cc: fengguang.wu(a)intel.com Cc: bigeasy(a)linutronix.de Link: http://lkml.kernel.org/r/1457314344-5685-1-git-send-email-nasa4836@gmail.com Signed-off-by: Thomas Gleixner <tglx(a)linutronix.de> Signed-off-by: Davidlohr Bueso <dbueso(a)suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- kernel/futex.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) --- a/kernel/futex.c +++ b/kernel/futex.c @@ -1939,8 +1939,12 @@ static int unqueue_me(struct futex_q *q) /* In the common case we don't take the spinlock, which is nice. */ retry: - lock_ptr = q->lock_ptr; - barrier(); + /* + * q->lock_ptr can change between this read and the following spin_lock. + * Use READ_ONCE to forbid the compiler from reloading q->lock_ptr and + * optimizing lock_ptr out of the logic below. + */ + lock_ptr = READ_ONCE(q->lock_ptr); if (lock_ptr != NULL) { spin_lock(lock_ptr); /* Patches currently in stable-queue which might be from nasa4836(a)gmail.com are queue-4.4/futex-replace-barrier-in-unqueue_me-with-read_once.patch

7 years, 4 months

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[Linux-stable-mirror] [PATCH v2] x86/gpu: add CFL to early quirks

by Lucas De Marchi

CFL was missing from intel_early_ids[]. The PCI ID needs to be there to allow the memory region to be stolen, otherwise we could have RAM being arbitrarily overwritten if for example we keep using the UEFI framebuffer, depending on how BIOS has set up the e820 map. Fixes: b056f8f3d6b9 ("drm/i915/cfl: Add Coffee Lake PCI IDs for S Skus.") Signed-off-by: Lucas De Marchi <lucas.demarchi(a)intel.com> Cc: Rodrigo Vivi <rodrigo.vivi(a)intel.com> Cc: Anusha Srivatsa <anusha.srivatsa(a)intel.com> Cc: Jani Nikula <jani.nikula(a)linux.intel.com> Cc: Joonas Lahtinen <joonas.lahtinen(a)linux.intel.com> Cc: David Airlie <airlied(a)linux.ie> Cc: intel-gfx(a)lists.freedesktop.org Cc: dri-devel(a)lists.freedesktop.org Cc: Ingo Molnar <mingo(a)kernel.org> Cc: H. Peter Anvin <hpa(a)zytor.com> Cc: Thomas Gleixner <tglx(a)linutronix.de> Cc: x86(a)kernel.org Cc: <stable(a)vger.kernel.org> # v4.13+ 0890540e21cf drm/i915: add GT number to intel_device_info Cc: <stable(a)vger.kernel.org> # v4.13+ 41693fd52373 drm/i915/kbl: Change a KBL pci id to GT2 from GT1.5 Cc: <stable(a)vger.kernel.org> # v4.13+ Reviewed-by: Rodrigo Vivi <rodrigo.vivi(a)intel.com> --- v2: improve commit message, add Fixes tag and CC stable arch/x86/kernel/early-quirks.c | 1 + include/drm/i915_pciids.h | 6 ++++++ 2 files changed, 7 insertions(+) diff --git a/arch/x86/kernel/early-quirks.c b/arch/x86/kernel/early-quirks.c index 3cbb2c78a9df..bae0d32e327b 100644 --- a/arch/x86/kernel/early-quirks.c +++ b/arch/x86/kernel/early-quirks.c @@ -528,6 +528,7 @@ static const struct pci_device_id intel_early_ids[] __initconst = { INTEL_SKL_IDS(&gen9_early_ops), INTEL_BXT_IDS(&gen9_early_ops), INTEL_KBL_IDS(&gen9_early_ops), + INTEL_CFL_IDS(&gen9_early_ops), INTEL_GLK_IDS(&gen9_early_ops), INTEL_CNL_IDS(&gen9_early_ops), }; diff --git a/include/drm/i915_pciids.h b/include/drm/i915_pciids.h index 972a25633525..c65e4489006d 100644 --- a/include/drm/i915_pciids.h +++ b/include/drm/i915_pciids.h @@ -392,6 +392,12 @@ INTEL_VGA_DEVICE(0x3EA8, info), /* ULT GT3 */ \ INTEL_VGA_DEVICE(0x3EA5, info) /* ULT GT3 */ +#define INTEL_CFL_IDS(info) \ + INTEL_CFL_S_GT1_IDS(info), \ + INTEL_CFL_S_GT2_IDS(info), \ + INTEL_CFL_H_GT2_IDS(info), \ + INTEL_CFL_U_GT3_IDS(info) + /* CNL U 2+2 */ #define INTEL_CNL_U_GT2_IDS(info) \ INTEL_VGA_DEVICE(0x5A52, info), \ -- 2.14.3

7 years, 4 months

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[Linux-stable-mirror] [PATCH] usb: uas: unconditionally bring back host after reset

by Oliver Neukum

Quoting Hans: If we return 1 from our post_reset handler, then our disconnect handler will be called immediately afterwards. Since pre_reset blocks all scsi requests our disconnect handler will then hang in the scsi_remove_host call. This is esp. bad because our disconnect handler hanging for ever also stops the USB subsys from enumerating any new USB devices, causes commands like lsusb to hang, etc. In practice this happens when unplugging some uas devices because the hub code may see the device as needing a warm-reset and calls usb_reset_device before seeing the disconnect. In this case uas_configure_endpoints fails with -ENODEV. We do not want to print an error for this, so this commit also silences the shost_printk for -ENODEV. ENDQUOTE However, if we do that we better drop any unconditional execution and report to the SCSI subsystem that we have undergone a reset but we are not operational now. Signed-off-by: Oliver Neukum <oneukum(a)suse.com> Reported-by: Hans de Goede <hdegoede(a)redhat.com> CC: stable(a)vger.kernel.org --- drivers/usb/storage/uas.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/drivers/usb/storage/uas.c b/drivers/usb/storage/uas.c index 5d04c40ee40a..3b1b9695177a 100644 --- a/drivers/usb/storage/uas.c +++ b/drivers/usb/storage/uas.c @@ -1076,20 +1076,19 @@ static int uas_post_reset(struct usb_interface *intf) return 0; err = uas_configure_endpoints(devinfo); - if (err) { + if (err && err != ENODEV) shost_printk(KERN_ERR, shost, "%s: alloc streams error %d after reset", __func__, err); - return 1; - } + /* we must unblock the host in every case lest we deadlock */ spin_lock_irqsave(shost->host_lock, flags); scsi_report_bus_reset(shost, 0); spin_unlock_irqrestore(shost->host_lock, flags); scsi_unblock_requests(shost); - return 0; + return err ? 1 : 0; } static int uas_suspend(struct usb_interface *intf, pm_message_t message) -- 2.13.6

7 years, 4 months

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[Linux-stable-mirror] [PATCH] usb: uas: unconditionally bring back host after reset

by Oliver Neukum

Quoting Hans: If we return 1 from our post_reset handler, then our disconnect handler will be called immediately afterwards. Since pre_reset blocks all scsi requests our disconnect handler will then hang in the scsi_remove_host call. This is esp. bad because our disconnect handler hanging for ever also stops the USB subsys from enumerating any new USB devices, causes commands like lsusb to hang, etc. In practice this happens when unplugging some uas devices because the hub code may see the device as needing a warm-reset and calls usb_reset_device before seeing the disconnect. In this case uas_configure_endpoints fails with -ENODEV. We do not want to print an error for this, so this commit also silences the shost_printk for -ENODEV. ENDQUOTE However, if we do that we better drop any unconditional execution and report to the SCSI subsystem that we have undergone a reset but we are not operational now. Signed-off-by: Oliver Neukum <oneukum(a)suse.com> Reported-by: Hans de Goede <hdegoede(a)redhat.com> CC: stable(a)vger.kernel.org --- Makefile | 2 +- drivers/usb/storage/uas.c | 7 +++---- 2 files changed, 4 insertions(+), 5 deletions(-) diff --git a/Makefile b/Makefile index 7e02f951b284..5025bac05cdb 100644 --- a/Makefile +++ b/Makefile @@ -2,7 +2,7 @@ VERSION = 4 PATCHLEVEL = 15 SUBLEVEL = 0 -EXTRAVERSION = -rc4 +EXTRAVERSION = -rc4bs0108a NAME = Fearless Coyote # *DOCUMENTATION* diff --git a/drivers/usb/storage/uas.c b/drivers/usb/storage/uas.c index 5d04c40ee40a..3b1b9695177a 100644 --- a/drivers/usb/storage/uas.c +++ b/drivers/usb/storage/uas.c @@ -1076,20 +1076,19 @@ static int uas_post_reset(struct usb_interface *intf) return 0; err = uas_configure_endpoints(devinfo); - if (err) { + if (err && err != ENODEV) shost_printk(KERN_ERR, shost, "%s: alloc streams error %d after reset", __func__, err); - return 1; - } + /* we must unblock the host in every case lest we deadlock */ spin_lock_irqsave(shost->host_lock, flags); scsi_report_bus_reset(shost, 0); spin_unlock_irqrestore(shost->host_lock, flags); scsi_unblock_requests(shost); - return 0; + return err ? 1 : 0; } static int uas_suspend(struct usb_interface *intf, pm_message_t message) -- 2.13.6

7 years, 4 months

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Re: [Linux-stable-mirror] [PATCH] usb: dwc3: core: Don't try to get PHYs during suspend/resume

by Roger Quadros

On 11/01/18 11:31, Felipe Balbi wrote: > > Hi, > > Roger Quadros <rogerq(a)ti.com> writes: >>> Roger Quadros <rogerq(a)ti.com> writes: >>>>>>> - ret = dwc3_core_soft_reset(dwc); >>>>>>> + ret = dwc3_core_get_phy(dwc); >>>>>> >>>>>> we can get_phy in dwc3_core_init() as it will get called on resume(). >>>>>> This was the $subject of this patch. >>>>> >>>>> indeed. thanks :-) >>>>> >>>> >>>> oops sorry. I meant we can't call dwc3_core_get_phy() in dwc3_core_init(). :P >>> >>> bit of a chicken-and-egg problem. We need to setup the PHY interface >>> before getting the PHYs, but can't get PHY during resume. Maybe the best >>> way here would be to check for the pointers being valid. Something like: >>> >>> if (!phy) >>> get_phy(); >>> >> >> OK that should take care of not calling get_phy() on suspend. >> However there is one more issue with the approach >> >>> @@ -754,15 +754,15 @@ static int dwc3_core_init(struct dwc3 *dwc) >>> dwc->maximum_speed = USB_SPEED_HIGH; >>> } >>> >>> - ret = dwc3_core_get_phy(dwc); >>> + ret = dwc3_phy_setup(dwc); >>> if (ret) >>> goto err0; >> >> here we configure PHY related bits and register the ulpi interface. >> >>> >>> - ret = dwc3_core_soft_reset(dwc); >>> + ret = dwc3_core_get_phy(dwc); >>> if (ret) >>> goto err0; >>> >> >> we got the PHYs. all OK here. >> >>> - ret = dwc3_phy_setup(dwc); >>> + ret = dwc3_core_soft_reset(dwc); >>> if (ret) >>> goto err0; >> >> Now we do a soft reset. This means we loose the PHY configuration bits that we did >> in dwc3_phy_setup. So we need to call dwc3_phy_setup again but not re-register the ulpi interface. >> I can use a flag there so that dwc3_ulpi_init() is done only once. > > sounds like it's better to extract out a smaller function that just > checks if we need ULPI bus and registers it, something akin to: > > @@ -482,6 +482,21 @@ static void dwc3_cache_hwparams(struct dwc3 *dwc) > parms->hwparams8 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS8); > } > > +static int dwc3_ulpi_init(struct dwc3 *dwc) > +{ > + int intf; > + > + intf = DWC3_GHWPARAMS3_HSPHY_IFC(dwc->hwparams.hwparams3); > + > + if (intf == DWC3_GHWPARAMS3_HSPHY_IFC_ULPI || > + (intf == DWC3_GHWPARAMS3_HSPHY_IFC_UTMI_ULPI && > + dwc->hsphy_interface && > + !strncmp(dwc->hsphy_interface, "ulpi", 4))) > + return dwc3_ulpi_init(dwc); > + > + return 0; > +} > + > /** > * dwc3_phy_setup - Configure USB PHY Interface of DWC3 Core > * @dwc: Pointer to our controller context structure > @@ -563,11 +578,6 @@ static int dwc3_phy_setup(struct dwc3 *dwc) > break; > } > /* FALLTHROUGH */ > - case DWC3_GHWPARAMS3_HSPHY_IFC_ULPI: > - ret = dwc3_ulpi_init(dwc); > - if (ret) > - return ret; > - /* FALLTHROUGH */ > default: > break; > } > > Then we just call that outside of any functions that get called during PM. > Right. Seems like we've covered everything. I'll send a patch in a while. -- cheers, -roger Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

7 years, 4 months

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Linux-stable-mirror January 2018