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authorHou Tao <houtao1@huawei.com>2023-01-13 19:52:11 +0800
committerDavid Howells <dhowells@redhat.com>2023-01-30 12:51:54 +0000
commit3288666c72568fe1cc7f5c5ae33dfd3ab18004c8 (patch)
treebe3af6c5f73e396fe2786fd7c1359bdc9a161f41 /mm/slab.c
parent8226e37d82f43657da34dd770e2b38f20242ada7 (diff)
downloadlinux-3288666c72568fe1cc7f5c5ae33dfd3ab18004c8.tar.bz2
fscache: Use clear_and_wake_up_bit() in fscache_create_volume_work()
fscache_create_volume_work() uses wake_up_bit() to wake up the processes which are waiting for the completion of volume creation. According to comments in wake_up_bit() and waitqueue_active(), an extra smp_mb() is needed to guarantee the memory order between FSCACHE_VOLUME_CREATING flag and waitqueue_active() before invoking wake_up_bit(). Fixing it by using clear_and_wake_up_bit() to add the missing memory barrier. Reviewed-by: Jingbo Xu <jefflexu@linux.alibaba.com> Signed-off-by: Hou Tao <houtao1@huawei.com> Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Jeff Layton <jlayton@kernel.org> Link: https://lore.kernel.org/r/20230113115211.2895845-3-houtao@huaweicloud.com/ # v3
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