diff options
| author |   Eric Dumazet <edumazet@google.com> | 2019-10-09 15:10:15 -0700 |
|---|---|---|
| committer |   Jakub Kicinski <jakub.kicinski@netronome.com> | 2019-10-09 21:35:00 -0700 |
| commit | 1f142c17d19a5618d5a633195a46f2c8be9bf232 (patch) | |
| tree | b64b0a41ac143b7a2eefa20d06eab67a5c4f16da /net/ipv4/tcp.c | |
| parent | net: add {READ|WRITE}_ONCE() annotations on ->rskq_accept_head (diff) | |
| download | linux-dev-1f142c17d19a5618d5a633195a46f2c8be9bf232.tar.xz linux-dev-1f142c17d19a5618d5a633195a46f2c8be9bf232.zip | |
tcp: annotate lockless access to tcp_memory_pressure
tcp_memory_pressure is read without holding any lock,
and its value could be changed on other cpus.
Use READ_ONCE() to annotate these lockless reads.
The write side is already using atomic ops.
Fixes: b8da51ebb1aa ("tcp: introduce tcp_under_memory_pressure()")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Diffstat (limited to 'net/ipv4/tcp.c')
| -rw-r--r-- | net/ipv4/tcp.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index f98a1882e537..888c92b63f5a 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -326,7 +326,7 @@ void tcp_enter_memory_pressure(struct sock *sk) { unsigned long val; - if (tcp_memory_pressure) + if (READ_ONCE(tcp_memory_pressure)) return; val = jiffies; @@ -341,7 +341,7 @@ void tcp_leave_memory_pressure(struct sock *sk) { unsigned long val; - if (!tcp_memory_pressure) + if (!READ_ONCE(tcp_memory_pressure)) return; val = xchg(&tcp_memory_pressure, 0); if (val) |