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| author | Peter Zijlstra <peterz@infradead.org> | 2019-04-23 21:55:59 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-25 18:22:28 +0200 |
| commit | bd61ddd3e9fc45a9c7d8852827fec9f3693d278d (patch) | |
| tree | b62dbe8b48d9207ec5f64cad346d42c95ddf04e8 /net/lapb/lapb_timer.c | |
| parent | bd3713424a01a3ceb684a354363d5239eec1e9ee (diff) | |
bpf: Fix preempt_enable_no_resched() abuse
[ Upstream commit 0edd6b64d1939e9e9168ff27947995bb7751db5d ]
Unless the very next line is schedule(), or implies it, one must not use
preempt_enable_no_resched(). It can cause a preemption to go missing and
thereby cause arbitrary delays, breaking the PREEMPT=y invariant.
Cc: Roman Gushchin <guro@fb.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net/lapb/lapb_timer.c')
0 files changed, 0 insertions, 0 deletions