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Date: Tue, 6 Jun 2023 16:38:06 +0200 (CEST)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Frederic Weisbecker <frederic@...nel.org>,
Anna-Maria Behnsen <anna-maria@...utronix.de>,
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 30/45] 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>
---
include/linux/posix-timers.h | 4 +++-
kernel/time/posix-cpu-timers.c | 3 ++-
2 files changed, 5 insertions(+), 2 deletions(-)
--- a/include/linux/posix-timers.h
+++ b/include/linux/posix-timers.h
@@ -66,6 +66,7 @@ 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 {
@@ -73,7 +74,8 @@ struct cpu_timer {
struct timerqueue_head *head;
struct pid *pid;
struct list_head elist;
- int firing;
+ bool firing;
+ bool nanosleep;
struct task_struct __rcu *handling;
};
--- a/kernel/time/posix-cpu-timers.c
+++ b/kernel/time/posix-cpu-timers.c
@@ -586,7 +586,7 @@ static void cpu_timer_fire(struct k_itim
{
struct cpu_timer *ctmr = &timer->it.cpu;
- if (unlikely(timer->sigq == NULL)) {
+ if (unlikely(ctmr->nanosleep)) {
/*
* This a special case for clock_nanosleep,
* not a normal timer from sys_timer_create.
@@ -1471,6 +1471,7 @@ 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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