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| author | Valentin Schneider <[email protected]> | 2021-08-11 20:14:31 +0000 |
|---|---|---|
| committer | Rafael J. Wysocki <[email protected]> | 2021-08-16 16:55:32 +0000 |
| commit | b2f6662ac08d0e7c25574ce53623c71bdae9dd78 (patch) | |
| tree | b3c6f49796e96e69cb52f70fe7f16d2fec4b76ef /scripts/clang-tools/gen_compile_commands.py | |
| parent | Linux 5.14-rc6 (diff) | |
| download | kernel-b2f6662ac08d0e7c25574ce53623c71bdae9dd78.tar.gz kernel-b2f6662ac08d0e7c25574ce53623c71bdae9dd78.zip | |
PM: cpu: Make notifier chain use a raw_spinlock_t
Invoking atomic_notifier_chain_notify() requires acquiring a spinlock_t,
which can block under CONFIG_PREEMPT_RT. Notifications for members of the
cpu_pm notification chain will be issued by the idle task, which can never
block.
Making *all* atomic_notifiers use a raw_spinlock is too big of a hammer, as
only notifications issued by the idle task are problematic.
Special-case cpu_pm_notifier_chain by kludging a raw_notifier and
raw_spinlock_t together, matching the atomic_notifier behavior with a
raw_spinlock_t.
Fixes: 70d932985757 ("notifier: Fix broken error handling pattern")
Signed-off-by: Valentin Schneider <[email protected]>
Acked-by: Sebastian Andrzej Siewior <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
Diffstat (limited to 'scripts/clang-tools/gen_compile_commands.py')
0 files changed, 0 insertions, 0 deletions