diff mbox series

[39/45] signal: Provide ignored_posix_timers list

Message ID	20230606142033.225765113@linutronix.de
State	New
Headers	Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Message-ID: <20230606142033.225765113@linutronix.de> From: Thomas Gleixner <tglx@linutronix.de> To: LKML <linux-kernel@vger.kernel.org> Cc: Frederic Weisbecker <frederic@kernel.org>, Anna-Maria Behnsen <anna-maria@linutronix.de>, John Stultz <jstultz@google.com>, Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@kernel.org>, Stephen Boyd <sboyd@kernel.org>, Eric Biederman <ebiederm@xmission.com>, Oleg Nesterov <oleg@redhat.com> Subject: [patch 39/45] signal: Provide ignored_posix_timers list References: <20230606132949.068951363@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Date: Tue, 6 Jun 2023 16:38:20 +0200 (CEST) Precedence: bulk
Series	posix-timers: Cure inconsistencies and the SIG_IGN mess \| [00/45] posix-timers: Cure inconsistencies and the SIG_IGN mess [01/45] selftests/timers/posix_timers: Make signal distribution test less fragile [02/45] selftests/timers/posix_timers: Use TAP reporting format [03/45] selftests/timers/posix_timers: Add SIG_IGN test [04/45] selftests/timers/posix_timers: Validate signal rules [05/45] selftests/timers/posix-timers: Validate SIGEV_NONE [06/45] selftests/timers/posix-timers: Validate timer_gettime() [07/45] selftests/timers/posix-timers: Validate overrun after unblock [08/45] posix-timers: Convert timer list to hlist [09/45] posix-cpu-timers: Fix posix_cpu_timer_get() behaviour [10/45] posix-cpu-timers: Use @now instead of @val for clarity [11/45] posix-cpu-timers: Remove incorrect comment in posix_cpu_timer_set() [12/45] posix-cpu-timers: Simplify posix_cpu_timer_set() [13/45] posix-cpu-timers: Replace old expiry retrieval in posix_cpu_timer_set() [14/45] posix-timers: Consolidate interval retrieval [15/45] posix-timers: Clear overrun in common_timer_set() [16/45] posix-timers: Consolidate timer setup [17/45] posix-cpu-timers: Make k_itimer::it_active consistent [18/45] posix-timers: Consolidate signal queueing [19/45] signal: Remove task argument from dequeue_signal() [20/45] signal: Replace BUG_ON()s [21/45] signal: Confine POSIX_TIMERS properly [22/45] signal: Get rid of resched_timer logic [23/45] posix-timers: Cure si_sys_private race [24/45] signal: Allow POSIX timer signals to be dropped [25/45] posix-timers: Drop signal if timer has been deleted or reprogrammed [26/45] posix-timers: Rename k_itimer::it_requeue_pending [27/45] posix-timers: Add proper state tracking [28/45] posix-timers: Make signal delivery consistent [29/45] posix-timers: Make signal overrun accounting sensible [30/45] posix-cpu-timers: Use dedicated flag for CPU timer nanosleep [31/45] posix-timers: Add a refcount to struct k_itimer [32/45] signal: Split up __sigqueue_alloc() [33/45] signal: Provide posixtimer_sigqueue_init() [34/45] signal: Add sys_private_ptr to siginfo::_sifields::_timer [35/45] signal: Refactor send_sigqueue() [36/45] posix-timers: Embed sigqueue in struct k_itimer [37/45] signal: Cleanup unused posix-timer leftovers [38/45] signal: Add task argument to flush_sigqueue_mask() [39/45] signal: Provide ignored_posix_timers list [40/45] posix-timers: Handle ignored list on delete and exit [41/45] signal: Handle ignored signals in do_sigaction(action != SIG_IGN) [42/45] signal: Queue ignored posixtimers on ignore list [43/45] posix-timers: Cleanup SIG_IGN workaround leftovers [44/45] alarmtimers: Remove the throttle mechanism from alarm_forward_now() [45/45] alarmtimers: Remove return value from alarm functions

Commit Message

Thomas Gleixner June 6, 2023, 2:38 p.m. UTC

  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@linutronix.de>
---
 include/linux/sched/signal.h |    1 +
 init/init_task.c             |    5 +++--
 kernel/fork.c                |    1 +
 3 files changed, 5 insertions(+), 2 deletions(-)

diff mbox series

Patch

--- a/include/linux/sched/signal.h
+++ b/include/linux/sched/signal.h
@@ -137,6 +137,7 @@  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
@@ -28,8 +28,9 @@  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
@@ -1881,6 +1881,7 @@  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