Commit 2f687b4c authored by Yunsheng Lin's avatar Yunsheng Lin Committed by Zheng Zengkai
Browse files

page_pool: use relaxed atomic for release side accounting 

mainline inclusion
from mainline-v5.15-rc1
commit 7fb9b66d
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4CVS3
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7fb9b66dc9ce



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There is no need to synchronize the account updating, so
use the relaxed atomic to avoid some memory barrier in the
data path.

Acked-by: default avatarJesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: default avatarYunsheng Lin <linyunsheng@huawei.com>
Acked-by: default avatarIlias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Reviewed-by: default avatarYongxin Li <liyongxin1@huawei.com>
Signed-off-by: default avatarJunxin Chen <chenjunxin1@huawei.com>
Signed-off-by: default avatarZheng Zengkai <zhengzengkai@huawei.com>
parent a385b1bd

net/core/page_pool.c

+1 −1
Original line number Diff line number Diff line
@@ -370,7 +370,7 @@ void page_pool_release_page(struct page_pool *pool, struct page *page) 
	/* This may be the last page returned, releasing the pool, so

	 * it is not safe to reference pool afterwards.

	 */

	count = atomic_inc_return(&pool->pages_state_release_cnt);

	count = atomic_inc_return_relaxed(&pool->pages_state_release_cnt);

	trace_page_pool_state_release(pool, page, count);

}

EXPORT_SYMBOL(page_pool_release_page);