From nobody Sun Dec 14 18:11:36 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A4C2A31D396; Tue, 4 Nov 2025 08:17:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762244258; cv=none; b=FafTE3o9ScrKrlqrr3YGHvOoN1RI3Q0/b1qaXBsUeVik7PdbGquXEywwGGr8gjOsQTBlLzaGsPAelo3B4r+fesiafavTmVM/PnzY14pNOA3h2YKK4oQCV7F9xOYDr4HJYrIXRv6kNedPoCTIY9bcwX5D4WTt8KiiZClI5er5QEw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762244258; c=relaxed/simple; bh=2wifGR2S1YeYJlqfJc4OOPbSSM/F6Tg+/ogP7o8g024=; h=Date:From:To:Subject:Cc:In-Reply-To:References:MIME-Version: Message-ID:Content-Type; b=P/wqZTNTg1aGQkJTLzbIbbtqTMW0QDyzzBasZlN1teOxZkuiM1uyMkfGvOWfLXJnV52MlxixHDGaC6VVErsy/+0pUi0lIcU4sH8oHdmX07RdN1HE08qQ7fqn/D62aSWySkqcfTNIy+Muscjk01N2/mVIlBcXbUirLVFMQ0xj8Hw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=2QtpX1XF; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=bwtI/hyT; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="2QtpX1XF"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="bwtI/hyT" Date: Tue, 04 Nov 2025 08:17:33 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1762244255; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=1msc6RGrlUYRuzQg+IovsuYAqWsDYQBv0dwybLk+5kg=; b=2QtpX1XFhR9wXKUeKfL3zICNPa6UPS9KCTb5P8pJUxlIuv4J08cfJLNvdQgdl9zwx5U5Rq Jl0OYDvIL81sh8JZUML8Iuy245+o2kAuPmKvtytXGtwNZPzmQfCEndCviwXJ9dSvq1i64P oGTltAri1LV6pkhU+MrggLZ8OjpUrc/IG2Nz6hJU+qWS8x0MlOWq0ZPeG/ULvHx6Wp/RO/ GthT8Jh57g3YpLyvM85je1u4nWnlKNO0SzcQ+hiXaVzpZCCm/CZZ9yzV+bws8wCzWavVj6 r4D2W4pC3eMKQjkqRflV0E+/BkEcxr+gUUsL+hvm77NJ6+OVYIBZ32MzKKXlRA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1762244255; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=1msc6RGrlUYRuzQg+IovsuYAqWsDYQBv0dwybLk+5kg=; b=bwtI/hyT8MkqbaBSe0zK8JczmN9RZiVd/EOAUnI2Y8eJmARnhZi5K4ah7XD8BoxkPG14NW 97JsYwJkuSkgvUDQ== From: "tip-bot2 for Thomas Gleixner" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: core/rseq] rseq: Avoid CPU/MM CID updates when no event pending Cc: Thomas Gleixner , "Peter Zijlstra (Intel)" , Ingo Molnar , Mathieu Desnoyers , x86@kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <20251027084306.462964916@linutronix.de> References: <20251027084306.462964916@linutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <176224425380.2601451.8614581745521070941.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Precedence: bulk Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable The following commit has been merged into the core/rseq branch of tip: Commit-ID: 566d8015f7eef11d82cd63dc4e1f620fcfc2a394 Gitweb: https://git.kernel.org/tip/566d8015f7eef11d82cd63dc4e1f620fc= fc2a394 Author: Thomas Gleixner AuthorDate: Mon, 27 Oct 2025 09:44:31 +01:00 Committer: Ingo Molnar CommitterDate: Tue, 04 Nov 2025 08:30:43 +01:00 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: Thomas Gleixner Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Ingo Molnar Reviewed-by: Mathieu Desnoyers Link: https://patch.msgid.link/20251027084306.462964916@linutronix.de --- kernel/rseq.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/kernel/rseq.c b/kernel/rseq.c index 01e7113..81dddaf 100644 --- a/kernel/rseq.c +++ b/kernel/rseq.c @@ -464,11 +464,12 @@ void __rseq_handle_notify_resume(struct ksignal *ksig= , struct pt_regs *regs) t->rseq_event_pending =3D false; } =20 - if (IS_ENABLED(CONFIG_DEBUG_RSEQ) || event) { - ret =3D rseq_ip_fixup(regs, event); - if (unlikely(ret < 0)) - goto error; - } + if (!IS_ENABLED(CONFIG_DEBUG_RSEQ) && !event) + return; + + ret =3D rseq_ip_fixup(regs, event); + if (unlikely(ret < 0)) + goto error; =20 if (unlikely(rseq_update_cpu_node_id(t))) goto error;