The patch titled
Subject: mm-fix-list-corruptions-on-shmem-shrinklist-fix
has been added to the -mm tree. Its filename is
mm-fix-list-corruptions-on-shmem-shrinklist-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-fix-list-corruptions-on-shmem-shrinklist-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-fix-list-corruptions-on-shmem-shrinklist-fix.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Subject: mm-fix-list-corruptions-on-shmem-shrinklist-fix
add comments
Cc: <stable@xxxxxxxxxxxxxxx>
Cc: Cong Wang <xiyou.wangcong@xxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/shmem.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff -puN mm/shmem.c~mm-fix-list-corruptions-on-shmem-shrinklist-fix mm/shmem.c
--- a/mm/shmem.c~mm-fix-list-corruptions-on-shmem-shrinklist-fix
+++ a/mm/shmem.c
@@ -1022,6 +1022,10 @@ static int shmem_setattr(struct dentry *
*/
if (IS_ENABLED(CONFIG_TRANSPARENT_HUGE_PAGECACHE)) {
spin_lock(&sbinfo->shrinklist_lock);
+ /*
+ * _careful to defend against unlocked access to
+ * ->shrink_list in shmem_unused_huge_shrink()
+ */
if (list_empty_careful(&info->shrinklist)) {
list_add_tail(&info->shrinklist,
&sbinfo->shrinklist);
@@ -1817,6 +1821,10 @@ alloc_nohuge: page = shmem_alloc_and_ac
* to shrink under memory pressure.
*/
spin_lock(&sbinfo->shrinklist_lock);
+ /*
+ * _careful to defend against unlocked access to
+ * ->shrink_list in shmem_unused_huge_shrink()
+ */
if (list_empty_careful(&info->shrinklist)) {
list_add_tail(&info->shrinklist,
&sbinfo->shrinklist);
_
Patches currently in -mm which might be from akpm@xxxxxxxxxxxxxxxxxxxx are
i-need-old-gcc.patch
mm-make-tlb_flush_pending-global-fix.patch
mm-fix-list-corruptions-on-shmem-shrinklist-fix.patch
arm-arch-arm-include-asm-pageh-needs-personalityh.patch
ocfs2-old-mle-put-and-release-after-the-function-dlm_add_migration_mle-called-fix.patch
ocfs2-dlm-optimization-of-code-while-free-dead-node-locks-checkpatch-fixes.patch
mm.patch
mm-memory_hotplug-just-build-zonelist-for-new-added-node-fix.patch
mm-memory_hotplug-just-build-zonelist-for-new-added-node-fix-fix.patch
mm-thp-enable-thp-migration-in-generic-path-fix-fix.patch
zsmalloc-zs_page_migrate-skip-unnecessary-loops-but-not-return-ebusy-if-zspage-is-not-inuse-fix.patch
treewide-remove-gfp_temporary-allocation-flag-fix.patch
treewide-remove-gfp_temporary-allocation-flag-checkpatch-fixes.patch
userfaultfd-selftest-exercise-uffdio_copy-zeropage-eexist-fix.patch
add-testcases-for-memset16-32-64-fix.patch
kernel-reboot-add-devm_register_reboot_notifier-fix.patch
linux-next-git-rejects.patch
linux-next-rejects.patch
kernel-forkc-export-kernel_thread-to-modules.patch
slab-leaks3-default-y.patch