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Message-ID: <20240410165553.699821482@linutronix.de>
Date: Thu, 11 Apr 2024 00:47:29 +0200 (CEST)
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 V2 44/50] signal: Provide ignored_posix_timers list
To prepare for handling posix timer signals on sigaction(SIG_IGN) properly,
add a list to task::signal.
This list will be used to queue posix timers so their signal can be
requeued when SIG_IGN is lifted later.
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
include/linux/sched/signal.h | 1 +
init/init_task.c | 5 +++--
kernel/fork.c | 1 +
3 files changed, 5 insertions(+), 2 deletions(-)
--- a/include/linux/sched/signal.h
+++ b/include/linux/sched/signal.h
@@ -138,6 +138,7 @@ struct signal_struct {
/* POSIX.1b Interval Timers */
unsigned int next_posix_timer_id;
struct hlist_head posix_timers;
+ struct hlist_head ignored_posix_timers;
/* ITIMER_REAL timer for the process */
struct hrtimer real_timer;
--- a/init/init_task.c
+++ b/init/init_task.c
@@ -29,8 +29,9 @@ static struct signal_struct init_signals
.cred_guard_mutex = __MUTEX_INITIALIZER(init_signals.cred_guard_mutex),
.exec_update_lock = __RWSEM_INITIALIZER(init_signals.exec_update_lock),
#ifdef CONFIG_POSIX_TIMERS
- .posix_timers = HLIST_HEAD_INIT,
- .cputimer = {
+ .posix_timers = HLIST_HEAD_INIT,
+ .ignored_posix_timers = HLIST_HEAD_INIT,
+ .cputimer = {
.cputime_atomic = INIT_CPUTIME_ATOMIC,
},
#endif
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1877,6 +1877,7 @@ static int copy_signal(unsigned long clo
#ifdef CONFIG_POSIX_TIMERS
INIT_HLIST_HEAD(&sig->posix_timers);
+ INIT_HLIST_HEAD(&sig->ignored_posix_timers);
hrtimer_init(&sig->real_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
sig->real_timer.function = it_real_fn;
#endif
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