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posix-cpu-timers: Use dedicated flag for CPU timer nanosleep

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POSIX CPU timer nanosleep creates a k_itimer on stack and uses the sigq
pointer to detect the nanosleep case in the expiry function.

Prepare for embedding sigqueue into struct k_itimer by using a dedicated
flag for nanosleep.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/all/20241105064213.238550394@linutronix.de
This commit is contained in:
Thomas Gleixner 2024-11-05 09:14:35 +01:00
parent bf635681c9
commit 4cf7bf2a2f
2 changed files with 4 additions and 1 deletions
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2
include/linux/posix-timers.h
View File

@ -42,6 +42,7 @@ static inline int clockid_to_fd(const clockid_t clk)
* @pid: Pointer to target task PID
* @elist: List head for the expiry list
* @firing: Timer is currently firing
* @nanosleep: Timer is used for nanosleep and is not a regular posix-timer
* @handling: Pointer to the task which handles expiry
*/
struct cpu_timer {
@ -50,6 +51,7 @@ struct cpu_timer {
struct pid *pid;
struct list_head elist;
bool firing;
bool nanosleep;
struct task_struct __rcu *handling;
};

3
kernel/time/posix-cpu-timers.c
View File

@ -596,7 +596,7 @@ static void cpu_timer_fire(struct k_itimer *timer)
timer->it_status = POSIX_TIMER_DISARMED;
if (unlikely(timer->sigq == NULL)) {
if (unlikely(ctmr->nanosleep)) {
/*
* This a special case for clock_nanosleep,
* not a normal timer from sys_timer_create.
@ -1493,6 +1493,7 @@ static int do_cpu_nanosleep(const clockid_t which_clock, int flags,
timer.it_overrun = -1;
error = posix_cpu_timer_create(&timer);
timer.it_process = current;
timer.it.cpu.nanosleep = true;
if (!error) {
static struct itimerspec64 zero_it;