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| author | Juri Lelli <juri.lelli@redhat.com> | 2022-06-27 11:50:51 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-08-25 11:17:29 +0200 |
| commit | bd80dd86f9bfc6c86ac7dfda912b6706953c4b59 (patch) | |
| tree | 4ebf1b323d5343b6754bc99588d02adb96902c30 /include | |
| parent | 3fb368c0ae39ed6075fe45bef3ba9783213192a6 (diff) | |
| download | linux-stable-bd80dd86f9bfc6c86ac7dfda912b6706953c4b59.tar.gz linux-stable-bd80dd86f9bfc6c86ac7dfda912b6706953c4b59.tar.bz2 linux-stable-bd80dd86f9bfc6c86ac7dfda912b6706953c4b59.zip | |
wait: Fix __wait_event_hrtimeout for RT/DL tasks
[ Upstream commit cceeeb6a6d02e7b9a74ddd27a3225013b34174aa ]
Changes to hrtimer mode (potentially made by __hrtimer_init_sleeper on
PREEMPT_RT) are not visible to hrtimer_start_range_ns, thus not
accounted for by hrtimer_start_expires call paths. In particular,
__wait_event_hrtimeout suffers from this problem as we have, for
example:
fs/aio.c::read_events
wait_event_interruptible_hrtimeout
__wait_event_hrtimeout
hrtimer_init_sleeper_on_stack <- this might "mode |= HRTIMER_MODE_HARD"
on RT if task runs at RT/DL priority
hrtimer_start_range_ns
WARN_ON_ONCE(!(mode & HRTIMER_MODE_HARD) ^ !timer->is_hard)
fires since the latter doesn't see the change of mode done by
init_sleeper
Fix it by making __wait_event_hrtimeout call hrtimer_sleeper_start_expires,
which is aware of the special RT/DL case, instead of hrtimer_start_range_ns.
Reported-by: Bruno Goncalves <bgoncalv@redhat.com>
Signed-off-by: Juri Lelli <juri.lelli@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Reviewed-by: Valentin Schneider <vschneid@redhat.com>
Link: https://lore.kernel.org/r/20220627095051.42470-1-juri.lelli@redhat.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/wait.h | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/include/linux/wait.h b/include/linux/wait.h index 5903b1d17c92..7d04c1b588c7 100644 --- a/include/linux/wait.h +++ b/include/linux/wait.h @@ -529,10 +529,11 @@ do { \ \ hrtimer_init_sleeper_on_stack(&__t, CLOCK_MONOTONIC, \ HRTIMER_MODE_REL); \ - if ((timeout) != KTIME_MAX) \ - hrtimer_start_range_ns(&__t.timer, timeout, \ - current->timer_slack_ns, \ - HRTIMER_MODE_REL); \ + if ((timeout) != KTIME_MAX) { \ + hrtimer_set_expires_range_ns(&__t.timer, timeout, \ + current->timer_slack_ns); \ + hrtimer_sleeper_start_expires(&__t, HRTIMER_MODE_REL); \ + } \ \ __ret = ___wait_event(wq_head, condition, state, 0, 0, \ if (!__t.task) { \ |