From mboxrd@z Thu Jan 1 00:00:00 1970 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 5DE872DF145 for ; Mon, 8 Sep 2025 21:31:43 +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=1757367104; cv=none; b=JdFrUHTsU5Cmzh1BuvxWTxHjcn8AnZbA//oSG5+ILMyjMu3XLp3Dz14RHAQIVBKT1mzCOarlRZ+FOToVfvKMZ7d28e65ttCuN8KHAaCR2Hzq3LPZeGkjCRf3CnIUVMze0WKJ/zTV7/dJx1fbGl8Ogo672wgFfiKu/QZ+OtVS+5E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757367104; c=relaxed/simple; bh=pVR68kiPsXqv47e/THuSngp8VKiZpQ22MCdrVQMkWqQ=; h=Message-ID:From:To:Cc:Subject:References:MIME-Version: Content-Type:Date; b=C8pGaNUjM1bRIlC85QlnGEdqpQ22vqTDHhlyal30NwCr8BgqgHxD9S7a+520VW8RI6mTola+kuSWeWVLy5LtlXxN62jKc/xaZRT/up8u9Nd6PlSilgN8HOF7slz8+4f9b8xnHNcGirkUBJTy4JWysM/n0MEiAy26NggjkP9BlcQ= 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=NtIMkiun; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=NtRC7U0R; 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="NtIMkiun"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="NtRC7U0R" Message-ID: <20250908212925.775679381@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1757367101; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=7/41HQj17+XAeIrZidZizZdtvc2MyB7e0HKF5+3Od54=; b=NtIMkiunTXLrtCQV0bkjjtNn+uZ18rI2qlko5rCJzVdQC28Yawbh9ukylGVOn9vGLz0zMq A6LewFG4GPrm248NxNA8yiEFa67+Ji6NEjAe6PA7R3zxbPHTmGC3DyRoRC0vLVfEwb5hTX gNH8Z7G29WlHnggPzWe4exZbpg98WnPsEkHnRucoZtHUYiW7w4tM+LXLbp16v5ff5iGH6s hKhy+jCULQtFJzdjODweF0sKxoTHK/+dL90N5gsIx+2w7GPMTjtbRxz7Vw+hJtU2u5+VcQ Qtrs8FyxzZnGEVZDywsAZBLi/9oSpQX01KALewAm6Mh9J8XpRpofP3QzE9dV8A== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1757367101; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=7/41HQj17+XAeIrZidZizZdtvc2MyB7e0HKF5+3Od54=; b=NtRC7U0RDh9JBHxGW/kPBfax2F+hYEiWk9909mH8hECkDW9jcGKJ9ChemTaTQa/KN/QrKf PPZSejreVP6shFAg== From: Thomas Gleixner To: LKML Cc: Michael Jeanson , Jens Axboe , Mathieu Desnoyers , Peter Zijlstra , "Paul E. McKenney" , Boqun Feng , Paolo Bonzini , Sean Christopherson , Wei Liu , Dexuan Cui , x86@kernel.org, Arnd Bergmann , Heiko Carstens , Christian Borntraeger , Sven Schnelle , Huacai Chen , Paul Walmsley , Palmer Dabbelt Subject: [patch V4 08/36] rseq: Avoid CPU/MM CID updates when no event pending References: <20250908212737.353775467@linutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Date: Mon, 8 Sep 2025 23:31:40 +0200 (CEST) There is no need to update these values unconditionally if there is no event pending. Signed-off-by: Thomas Gleixner --- kernel/rseq.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) --- a/kernel/rseq.c +++ b/kernel/rseq.c @@ -464,11 +464,12 @@ void __rseq_handle_notify_resume(struct 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;