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Message-ID: <20241105064213.238550394@linutronix.de>
Date: Tue, 5 Nov 2024 09:14:35 +0100 (CET)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Anna-Maria Behnsen <anna-maria@...utronix.de>,
Frederic Weisbecker <frederic@...nel.org>,
John Stultz <jstultz@...gle.com>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...nel.org>,
Stephen Boyd <sboyd@...nel.org>,
Eric Biederman <ebiederm@...ssion.com>,
Oleg Nesterov <oleg@...hat.com>
Subject: [patch V7 05/21] posix-cpu-timers: Use dedicated flag for CPU timer
nanosleep
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@...utronix.de>
Reviewed-by: Frederic Weisbecker <frederic@...nel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
include/linux/posix-timers.h | 2 ++
kernel/time/posix-cpu-timers.c | 3 ++-
2 files changed, 4 insertions(+), 1 deletion(-)
---
--- a/include/linux/posix-timers.h
+++ b/include/linux/posix-timers.h
@@ -42,6 +42,7 @@ static inline int clockid_to_fd(const cl
* @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;
};
--- a/kernel/time/posix-cpu-timers.c
+++ b/kernel/time/posix-cpu-timers.c
@@ -596,7 +596,7 @@ static void cpu_timer_fire(struct k_itim
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 clocki
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;
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