diff options
| author | Hui Su <sh_def@163.com> | 2026-10-16 10:09:43 +0900 |
|---|---|---|
| committer | Thomas Gleixner <tglx@kernel.org> | 2026-10-25 22:43:19 +0100 |
| commit | 064bcd117e8a1a266bb92b840f63862999b7cb87 (patch) | |
| tree | 307d72210e27990b7295bc570c34819b5681f75d /kernel/time | |
| parent | 6541fbc942f3b63bb8bd44e34eee6223e0abe719 (diff) | |
hrtimer: Add cleanup class for on-stack timers
hrtimer_setup_on_stack() requires callers to destroy the timer before its
backing stack storage goes out of scope, but the setup interface does not
encode the required teardown pairing.
Add an hrtimer_on_stack cleanup class that pairs on-stack setup with
destroy_hrtimer_on_stack(). Document the existing setup API's lifetime
requirement.
The cleanup class provides debug-object teardown, not timer
cancellation. Callers must ensure that no hrtimer operation can still
access the timer before the scope ends; in particular, the timer must
no longer be queued and any running callback must have completed.
Signed-off-by: Hui Su <sh_def@163.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/5f48c32490d19f51035e4209174f9cfe44472c71.1792083743.git.sh_def@163.com
Diffstat (limited to 'kernel/time')
| -rw-r--r-- | kernel/time/hrtimer.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c index cbf1693c86b3..12e136d5691f 100644 --- a/kernel/time/hrtimer.c +++ b/kernel/time/hrtimer.c @@ -1975,8 +1975,12 @@ EXPORT_SYMBOL_GPL(hrtimer_setup); * @clock_id: The clock to be used * @mode: The timer mode * - * Similar to hrtimer_setup(), except that this one must be used if struct hrtimer is in stack - * memory. + * Similar to hrtimer_setup(), except that this one must be used if struct + * hrtimer is in stack memory. + * + * Callers that do not use the hrtimer_on_stack cleanup class must call + * destroy_hrtimer_on_stack() before the stack storage goes out of scope. The + * cleanup class pairs setup and destruction automatically. */ void hrtimer_setup_on_stack(struct hrtimer *timer, enum hrtimer_restart (*function)(struct hrtimer *), |