The patch titled
Subject: ipc-semc-chance-memory-barrier-in-sem_lock-to-smp_rmb-fix
has been removed from the -mm tree. Its filename was
ipc-semc-chance-memory-barrier-in-sem_lock-to-smp_rmb-fix.patch
This patch was dropped because it was folded into ipc-semc-chance-memory-barrier-in-sem_lock-to-smp_rmb.patch
------------------------------------------------------
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Subject: ipc-semc-chance-memory-barrier-in-sem_lock-to-smp_rmb-fix
update sem_lock() comment, from Davidlohr
Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Cc: Manfred Spraul <manfred@xxxxxxxxxxxxxxxx>
Cc: Rafael Aquini <aquini@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
ipc/sem.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff -puN ipc/sem.c~ipc-semc-chance-memory-barrier-in-sem_lock-to-smp_rmb-fix ipc/sem.c
--- a/ipc/sem.c~ipc-semc-chance-memory-barrier-in-sem_lock-to-smp_rmb-fix
+++ a/ipc/sem.c
@@ -327,10 +327,11 @@ static inline int sem_lock(struct sem_ar
/* Then check that the global lock is free */
if (!spin_is_locked(&sma->sem_perm.lock)) {
/*
- * The next test must happen after the test for
- * sem_perm.lock, otherwise we can race with another
- * thread that does
- * complex_count++;spin_unlock(sem_perm.lock);
+ * The ipc object lock check must be visible on all
+ * cores before rechecking the complex count. Otherwise
+ * we can race with another thread that does:
+ * complex_count++++;
+ * spin_unlock(sem_perm.lock);
*/
smp_rmb();
_
Patches currently in -mm which might be from akpm@xxxxxxxxxxxxxxxxxxxx are
origin.patch
mm-mincore-add-hwpoison-page-handle.patch
include-linux-kmemleakh-needs-slabh.patch
mm-page_owner-keep-track-of-page-owners.patch
fs-seq_file-fallback-to-vmalloc-instead-of-oom-kill-processes.patch
oom-dont-assume-that-a-coredumping-thread-will-exit-soon.patch
mm-memcontrol-fix-defined-but-not-used-compiler-warning.patch
zsmalloc-fix-zs_init-cpu-notifier-error-handling.patch
mm-zsmalloc-support-allocating-obj-with-size-of-zs_max_alloc_size.patch
mm-zsmalloc-avoid-duplicate-assignment-of-prev_class.patch
ipc-semc-chance-memory-barrier-in-sem_lock-to-smp_rmb.patch
ipc-semc-chance-memory-barrier-in-sem_lock-to-smp_rmb-fix-fix.patch
ipc-msg-increase-msgmni-remove-scaling-checkpatch-fixes.patch
mm-cma-make-kmemleak-ignore-cma-regions.patch
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