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| author | Josef Bacik <[email protected]> | 2012-08-01 19:36:24 +0000 |
|---|---|---|
| committer | Chris Mason <[email protected]> | 2012-08-28 20:53:33 +0000 |
| commit | 66657b318e0e443ada229fccd40c8be86cfebdbf (patch) | |
| tree | bf1334fff93556fbc8d82b26a6d5431fd9e74b5c /lib/dynamic_debug.c | |
| parent | Btrfs: fix deadlock in wait_for_more_refs (diff) | |
| download | kernel-66657b318e0e443ada229fccd40c8be86cfebdbf.tar.gz kernel-66657b318e0e443ada229fccd40c8be86cfebdbf.zip | |
Btrfs: barrier before waitqueue_active
We need a barrir before calling waitqueue_active otherwise we will miss
wakeups. So in places that do atomic_dec(); then atomic_read() use
atomic_dec_return() which imply a memory barrier (see memory-barriers.txt)
and then add an explicit memory barrier everywhere else that need them.
Thanks,
Signed-off-by: Josef Bacik <[email protected]>
Diffstat (limited to 'lib/dynamic_debug.c')
0 files changed, 0 insertions, 0 deletions