The patch titled
Subject: cpu-hotplug-debug-detect-imbalance-between-get_online_cpus-and-put_online_cpus-fix
has been added to the -mm tree. Its filename is
cpu-hotplug-debug-detect-imbalance-between-get_online_cpus-and-put_online_cpus-fix.patch
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------------------------------------------------------
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Subject: cpu-hotplug-debug-detect-imbalance-between-get_online_cpus-and-put_online_cpus-fix
s/BUG/WARN/ and try to fix things up
Cc: "Srivatsa S. Bhat" <srivatsa.bhat@xxxxxxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Jiri Kosina <jkosina@xxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Srivatsa S. Bhat <srivatsa.bhat@xxxxxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/cpu.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff -puN kernel/cpu.c~cpu-hotplug-debug-detect-imbalance-between-get_online_cpus-and-put_online_cpus-fix kernel/cpu.c
--- a/kernel/cpu.c~cpu-hotplug-debug-detect-imbalance-between-get_online_cpus-and-put_online_cpus-fix
+++ a/kernel/cpu.c
@@ -80,9 +80,12 @@ void put_online_cpus(void)
if (cpu_hotplug.active_writer == current)
return;
mutex_lock(&cpu_hotplug.lock);
- BUG_ON(cpu_hotplug.refcount == 0);
- if (!--cpu_hotplug.refcount && unlikely(cpu_hotplug.active_writer))
- wake_up_process(cpu_hotplug.active_writer);
+ if (!--cpu_hotplug.refcount) {
+ if (WARN_ON(cpu_hotplug.refcount == -1))
+ cpu_hotplug.refcount++; /* try to fix things up */
+ if (unlikely(cpu_hotplug.active_writer))
+ wake_up_process(cpu_hotplug.active_writer);
+ }
mutex_unlock(&cpu_hotplug.lock);
}
_
Patches currently in -mm which might be from akpm@xxxxxxxxxxxxxxxxxxxx are
origin.patch
linux-next.patch
i-need-old-gcc.patch
arch-alpha-kernel-systblss-remove-debug-check.patch
cpu_hotplug-unmap-cpu2node-when-the-cpu-is-hotremoved-fix.patch
arch-x86-platform-iris-irisc-register-a-platform-device-and-a-platform-driver.patch
arch-x86-tools-insn_sanityc-identify-source-of-messages.patch
audith-replace-defines-with-c-stubs.patch
audith-replace-defines-with-c-stubs-fix.patch
mm.patch
x86-pat-separate-the-pfn-attribute-tracking-for-remap_pfn_range-and-vm_insert_pfn-fix.patch
mm-kill-vma-flag-vm_reserved-and-mm-reserved_vm-counter-fix.patch
mm-fix-nonuniform-page-status-when-writing-new-file-with-small-buffer-fix.patch
mm-fix-nonuniform-page-status-when-writing-new-file-with-small-buffer-fix-fix.patch
mm-vmscan-scale-number-of-pages-reclaimed-by-reclaim-compaction-based-on-failures-fix.patch
mm-mmu_notifier-fix-inconsistent-memory-between-secondary-mmu-and-host-fix.patch
rbtree-performance-and-correctness-test-fix.patch
mm-cma-discard-clean-pages-during-contiguous-allocation-instead-of-migration-fix-fix.patch
mm-fix-tracing-in-free_pcppages_bulk-fix.patch
cma-count-free-cma-pages-fix.patch
memory-hotplug-fix-pages-missed-by-race-rather-than-failng-fix.patch
atomic-implement-generic-atomic_dec_if_positive-fix.patch
swap-add-a-simple-detector-for-inappropriate-swapin-readahead-fix.patch
mm-compaction-abort-compaction-loop-if-lock-is-contended-or-run-too-long.patch
mm-compaction-abort-compaction-loop-if-lock-is-contended-or-run-too-long-fix.patch
mm-compaction-abort-compaction-loop-if-lock-is-contended-or-run-too-long-fix-2.patch
mm-compaction-acquire-the-zone-lru_lock-as-late-as-possible-fix-fix.patch
mm-page_alloc-refactor-out-__alloc_contig_migrate_alloc-checkpatch-fixes.patch
mm-fix-invalidate_complete_page2-lock-ordering.patch
mm-numa-reclaim-from-all-nodes-within-reclaim-distance-fix.patch
mm-move-all-mmu-notifier-invocations-to-be-done-outside-the-pt-lock.patch
cma-migrate-mlocked-pages-fix.patch
fs-block_devc-set_blocksize-use-mapping_mapped.patch
mm-avoid-section-mismatch-warning-for-memblock_type_name-fix.patch
sections-fix-section-conflicts-in-arch-h8300-checkpatch-fixes.patch
sections-fix-section-conflicts-in-drivers-macintosh-checkpatch-fixes.patch
sectons-fix-const-sections-for-crc32-table-checkpatch-fixes.patch
backlight-add-backlight-driver-for-lm3630-chip-fix.patch
backlight-add-new-lm3639-backlight-driver-fix.patch
backlight-platform-lcd-add-support-for-device-tree-based-probe-fix.patch
idr-rename-max_level-to-max_idr_level-fix.patch
idr-rename-max_level-to-max_idr_level-fix-fix-2.patch
idr-rename-max_level-to-max_idr_level-fix-3.patch
lib-parserc-avoid-overflow-in-match_number-fix.patch
lib-spinlock_debug-avoid-livelock-in-do_raw_spin_lock-fix.patch
drivers-firmware-dmi_scanc-check-dmi-version-when-get-system-uuid-fix.patch
drivers-firmware-dmi_scanc-fetch-dmi-version-from-smbios-if-it-exists-checkpatch-fixes.patch
rtc-add-dallas-ds2404-driver-fix.patch
rtc-snvs-add-freescale-rtc-snvs-driver-fix.patch
hfsplus-add-support-of-manipulation-by-attributes-file-checkpatch-fixes.patch
fs-fat-fix-all-other-checkpatch-issues-in-dirc-fix.patch
fat-simplify-writeback_inode-checkpatch-fixes.patch
fat-simplify-writeback_inode-checkpatch-fixes-fix.patch
coredump-make-core-dump-functionality-optional-fix-fix.patch
coredump-use-suid_dumpable_enabled-rather-than-hardcoded-1-checkpatch-fixes.patch
proc-use-kzalloc-instead-of-kmalloc-and-memset-fix.patch
cpu-hotplug-debug-detect-imbalance-between-get_online_cpus-and-put_online_cpus-fix.patch
journal_add_journal_head-debug.patch
kernel-forkc-export-kernel_thread-to-modules.patch
mutex-subsystem-synchro-test-module-fix.patch
slab-leaks3-default-y.patch
put_bh-debug.patch
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