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

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

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://patch.msgid.link/20251027084306.462964916@linutronix.de
This commit is contained in:
Thomas Gleixner
2025-10-27 09:44:31 +01:00
committed by Ingo Molnar
parent 83409986f4
commit 566d8015f7
1 changed files with 6 additions and 5 deletions
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11
kernel/rseq.c
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@@ -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) {
ret = rseq_ip_fixup(regs, event);
if (unlikely(ret < 0))
goto error;
}
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;