linux-kernel - [GIT PULL] scheduler fixes

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Message-ID: <Z_Kx5hEaGkrLgyLf@gmail.com>
Date: Sun, 6 Apr 2025 18:55:02 +0200
From: Ingo Molnar <mingo@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: [GIT PULL] scheduler fixes

Linus,

Please pull the latest sched/urgent Git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched-urgent-2025-04-06

   # HEAD: 169eae7711ea4b745e2d33d53e7b88689b10e1a0 rseq: Eliminate useless task_work on execve

Miscellaneous scheduler fixes/updates:

 - Fix a nonsensical Kconfig combination
 - Remove an unnecessary rseq-notification

 Thanks,

	Ingo

------------------>
Mathieu Desnoyers (1):
      rseq: Eliminate useless task_work on execve

Oleg Nesterov (1):
      sched/isolation: Make CONFIG_CPU_ISOLATION depend on CONFIG_SMP


 fs/exec.c           | 3 ++-
 init/Kconfig        | 2 +-
 kernel/sched/core.c | 1 -
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/exec.c b/fs/exec.c
index 5d1c0d2dc403..8e4ea5f1e64c 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1864,9 +1864,9 @@ static int bprm_execve(struct linux_binprm *bprm)
 		goto out;
 
 	sched_mm_cid_after_execve(current);
+	rseq_execve(current);
 	/* execve succeeded */
 	current->in_execve = 0;
-	rseq_execve(current);
 	user_events_execve(current);
 	acct_update_integrals(current);
 	task_numa_free(current, false);
@@ -1883,6 +1883,7 @@ static int bprm_execve(struct linux_binprm *bprm)
 		force_fatal_sig(SIGSEGV);
 
 	sched_mm_cid_after_execve(current);
+	rseq_set_notify_resume(current);
 	current->in_execve = 0;
 
 	return retval;
diff --git a/init/Kconfig b/init/Kconfig
index 681f38ee68db..ab9b0c2c3d52 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -709,7 +709,7 @@ endmenu # "CPU/Task time and stats accounting"
 
 config CPU_ISOLATION
 	bool "CPU isolation"
-	depends on SMP || COMPILE_TEST
+	depends on SMP
 	default y
 	help
 	  Make sure that CPUs running critical tasks are not disturbed by
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index cfaca3040b2f..c81cf642dba0 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -10703,7 +10703,6 @@ void sched_mm_cid_after_execve(struct task_struct *t)
 		smp_mb();
 		t->last_mm_cid = t->mm_cid = mm_cid_get(rq, t, mm);
 	}
-	rseq_set_notify_resume(t);
 }
 
 void sched_mm_cid_fork(struct task_struct *t)