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authorMing Lei <tom.leiming@gmail.com>2014-01-15 02:56:42 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-15 08:19:42 +0100
commit74e72f894d56eb9d2e1218530c658e7d297e002b (patch)
treeb8fe55badb0f3edc43a68576823ffad76f5e5770 /kernel/posix-timers.c
parentcrash_dump: fix compilation error (on MIPS at least) (diff)
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lib/percpu_counter.c: fix __percpu_counter_add()
__percpu_counter_add() may be called in softirq/hardirq handler (such as, blk_mq_queue_exit() is typically called in hardirq/softirq handler), so we need to call this_cpu_add()(irq safe helper) to update percpu counter, otherwise counts may be lost. This fixes the problem that 'rmmod null_blk' hangs in blk_cleanup_queue() because of miscounting of request_queue->mq_usage_counter. This patch is the v1 of previous one of "lib/percpu_counter.c: disable local irq when updating percpu couter", and takes Andrew's approach which may be more efficient for ARCHs(x86, s390) that have optimized this_cpu_add(). Signed-off-by: Ming Lei <tom.leiming@gmail.com> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: Shaohua Li <shli@fusionio.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Fan Du <fan.du@windriver.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/posix-timers.c')
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