linux-kernel - [tip: sched/core] signal: Hand SIGQUEUE_PREALLOC flag to __sigqueue

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Date:   Thu, 15 Apr 2021 08:37:35 -0000
From:   "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: sched/core] signal: Hand SIGQUEUE_PREALLOC flag to __sigqueue_alloc()

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     69995ebbb9d3717306a165db88a1292b63f77a37
Gitweb:        https://git.kernel.org/tip/69995ebbb9d3717306a165db88a1292b63f77a37
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Mon, 22 Mar 2021 10:19:42 +01:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Wed, 14 Apr 2021 18:04:08 +02:00

signal: Hand SIGQUEUE_PREALLOC flag to __sigqueue_alloc()

There is no point in having the conditional at the callsite.

Just hand in the allocation mode flag to __sigqueue_alloc() and use it to
initialize sigqueue::flags.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lkml.kernel.org/r/20210322092258.898677147@linutronix.de
---
 kernel/signal.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/kernel/signal.c b/kernel/signal.c
index ba4d1ef..568a2e2 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -410,7 +410,8 @@ void task_join_group_stop(struct task_struct *task)
  *   appropriate lock must be held to stop the target task from exiting
  */
 static struct sigqueue *
-__sigqueue_alloc(int sig, struct task_struct *t, gfp_t flags, int override_rlimit)
+__sigqueue_alloc(int sig, struct task_struct *t, gfp_t gfp_flags,
+		 int override_rlimit, const unsigned int sigqueue_flags)
 {
 	struct sigqueue *q = NULL;
 	struct user_struct *user;
@@ -432,7 +433,7 @@ __sigqueue_alloc(int sig, struct task_struct *t, gfp_t flags, int override_rlimi
 	rcu_read_unlock();
 
 	if (override_rlimit || likely(sigpending <= task_rlimit(t, RLIMIT_SIGPENDING))) {
-		q = kmem_cache_alloc(sigqueue_cachep, flags);
+		q = kmem_cache_alloc(sigqueue_cachep, gfp_flags);
 	} else {
 		print_dropped_signal(sig);
 	}
@@ -442,7 +443,7 @@ __sigqueue_alloc(int sig, struct task_struct *t, gfp_t flags, int override_rlimi
 			free_uid(user);
 	} else {
 		INIT_LIST_HEAD(&q->list);
-		q->flags = 0;
+		q->flags = sigqueue_flags;
 		q->user = user;
 	}
 
@@ -1113,7 +1114,8 @@ static int __send_signal(int sig, struct kernel_siginfo *info, struct task_struc
 	else
 		override_rlimit = 0;
 
-	q = __sigqueue_alloc(sig, t, GFP_ATOMIC, override_rlimit);
+	q = __sigqueue_alloc(sig, t, GFP_ATOMIC, override_rlimit, 0);
+
 	if (q) {
 		list_add_tail(&q->list, &pending->list);
 		switch ((unsigned long) info) {
@@ -1807,12 +1809,7 @@ EXPORT_SYMBOL(kill_pid);
  */
 struct sigqueue *sigqueue_alloc(void)
 {
-	struct sigqueue *q = __sigqueue_alloc(-1, current, GFP_KERNEL, 0);
-
-	if (q)
-		q->flags |= SIGQUEUE_PREALLOC;
-
-	return q;
+	return __sigqueue_alloc(-1, current, GFP_KERNEL, 0, SIGQUEUE_PREALLOC);
 }
 
 void sigqueue_free(struct sigqueue *q)