The patch titled
ksm-annotate-ksm_thread_mutex-is-no-deadlock-source-fix
has been added to the -mm tree. Its filename is
ksm-annotate-ksm_thread_mutex-is-no-deadlock-source-fix.patch
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------------------------------------------------------
Subject: ksm-annotate-ksm_thread_mutex-is-no-deadlock-source-fix
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
update comment, from Hugh
Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/ksm.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff -puN mm/ksm.c~ksm-annotate-ksm_thread_mutex-is-no-deadlock-source-fix mm/ksm.c
--- a/mm/ksm.c~ksm-annotate-ksm_thread_mutex-is-no-deadlock-source-fix
+++ a/mm/ksm.c
@@ -1724,8 +1724,11 @@ static int ksm_memory_callback(struct no
/*
* Keep it very simple for now: just lock out ksmd and
* MADV_UNMERGEABLE while any memory is going offline.
- * Mutex_lock_nested() is necessary to tell that
- * ksm_thread_mutex is not unlocked here intentionally.
+ * mutex_lock_nested() is necessary because lockdep was alarmed
+ * that here we take ksm_thread_mutex inside notifier chain
+ * mutex, and later take notifier chain mutex inside
+ * ksm_thread_mutex to unlock it. But that's safe because both
+ * are inside mem_hotplug_mutex.
*/
mutex_lock_nested(&ksm_thread_mutex, SINGLE_DEPTH_NESTING);
break;
_
Patches currently in -mm which might be from akpm@xxxxxxxxxxxxxxxxxxxx are
linux-next.patch
next-remove-localversion.patch
i-need-old-gcc.patch
arch-alpha-kernel-systblss-remove-debug-check.patch
documentation-filesystems-vfstxt-fix-repeasepage-description.patch
ksm-annotate-ksm_thread_mutex-is-no-deadlock-source-fix.patch
mm-vmap-area-cache.patch
arch-x86-kernel-apic-io_apicc-fix-warning.patch
drivers-gpu-drm-radeon-atomc-fix-warning.patch
irq-use-per_cpu-kstat_irqs-checkpatch-fixes.patch
headers_check-better-search-for-functions-in-headers-fix.patch
headers_check-better-search-for-functions-in-headers-fix-checkpatch-fixes.patch
leds-route-kbd-leds-through-the-generic-leds-layer.patch
atmel_serial-fix-rts-high-after-initialization-in-rs485-mode-fix.patch
drivers-message-fusion-mptsasc-fix-warning.patch
mm.patch
mm-vmstat-use-a-single-setter-function-and-callback-for-adjusting-percpu-thresholds-fix.patch
writeback-check-skipped-pages-on-wb_sync_all-update-fix.patch
writeback-make-nr_to_write-a-per-file-limit-fix.patch
sync_inode_metadata-fix-comment.patch
fs-mpagec-consolidate-code-checkpatch-fixes.patch
mm-vmscan-reclaim-order-0-and-use-compaction-instead-of-lumpy-reclaim-fix.patch
mm-migration-allow-migration-to-operate-asynchronously-and-avoid-synchronous-compaction-in-the-faster-path-fix.patch
mm-deactivate-invalidated-pages-fix.patch
frv-duplicate-output_buffer-of-e03-checkpatch-fixes.patch
hpet-factor-timer-allocate-from-open.patch
include-linux-kernelh-abs-fix-handling-of-32-bit-unsigneds-on-64-bit.patch
include-linux-kernelh-abs-fix-handling-of-32-bit-unsigneds-on-64-bit-fix.patch
fs-select-fix-information-leak-to-userspace-fix.patch
memcg-document-cgroup-dirty-memory-interfaces-fix.patch
fs-proc-basec-kernel-latencytopc-convert-sprintf_symbol-to-%ps-checkpatch-fixes.patch
exec_domain-establish-a-linux32-domain-on-config_compat-systems.patch
pps-add-async-pps-event-handler-fix.patch
memstick-add-driver-for-ricoh-r5c592-card-reader-fix.patch
journal_add_journal_head-debug.patch
slab-leaks3-default-y.patch
put_bh-debug.patch
getblk-handle-2tb-devices.patch
memblock-add-input-size-checking-to-memblock_find_region.patch
memblock-add-input-size-checking-to-memblock_find_region-fix.patch
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