mainline inclusion
from mainline-v5.4-rc4
commit 1f142c17d19a5618d5a633195a46f2c8be9bf232
category: bugfix
bugzilla: 24138
CVE: NA

-------------------------------------

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: b8da51eb ("tcp: introduce tcp_under_memory_pressure()")
Signed-off-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NJakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Nguodeqing <geffrey.guo@huawei.com>
Reviewed-by: NWenan Mao <maowenan@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>