diff options
| author | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2019-01-14 12:25:40 -0500 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-01-15 07:31:18 +1200 |
| commit | 3719876809e745b9db5293d418600c194bbf5c23 (patch) | |
| tree | 395e8ab29d48c025bae872b23830ad0c0fa47c03 /lib/bitmap.c | |
| parent | c962cb323ec260652cff9331e7bf3d606292db88 (diff) | |
sbitmap: Protect swap_lock from softirqs
The swap_lock used by sbitmap has a chain with locks taken from softirq,
but the swap_lock is not protected from being preempted by softirqs.
A chain exists of:
sbq->ws[i].wait -> dispatch_wait_lock -> swap_lock
Where the sbq->ws[i].wait lock can be taken from softirq context, which
means all locks below it in the chain must also be protected from
softirqs.
Reported-by: Clark Williams <williams@redhat.com>
Fixes: 58ab5e32e6fd ("sbitmap: silence bogus lockdep IRQ warning")
Fixes: ea86ea2cdced ("sbitmap: amortize cost of clearing bits")
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/bitmap.c')
0 files changed, 0 insertions, 0 deletions