sock: optimise sock_def_write_space barriers

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Now we have a separate path for sock_def_write_space() and can go one
step further. When it's called from sock_wfree() we know that there is a
preceding atomic for putting down ->sk_wmem_alloc. We can use it to
replace to replace smb_mb() with a less expensive
smp_mb__after_atomic(). It also removes an extra RCU read lock/unlock as
a small bonus.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Pavel Begunkov 2022-04-28 11:58:19 +01:00 • committed by David S. Miller

parent 052ada0968

commit 0a8afd9f02

1 changed files with 25 additions and 1 deletions

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net/core/sock.c

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