Commit 566d8015 authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Ingo Molnar
Browse files

rseq: Avoid CPU/MM CID updates when no event pending 



There is no need to update these values unconditionally if there is no
event pending.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
Reviewed-by: default avatarMathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://patch.msgid.link/20251027084306.462964916@linutronix.de
parent 83409986

kernel/rseq.c

+6 −5
Original line number Diff line number Diff line
@@ -464,11 +464,12 @@ void __rseq_handle_notify_resume(struct ksignal *ksig, struct pt_regs *regs) 
		t->rseq_event_pending = false;

	}



	if (IS_ENABLED(CONFIG_DEBUG_RSEQ) || event) {

	if (!IS_ENABLED(CONFIG_DEBUG_RSEQ) && !event)

		return;



	ret = rseq_ip_fixup(regs, event);

	if (unlikely(ret < 0))

		goto error;

	}



	if (unlikely(rseq_update_cpu_node_id(t)))

		goto error;