From nobody Wed Oct 1 22:30:48 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 4F74830C117 for ; Tue, 30 Sep 2025 17:01:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759251687; cv=none; b=ehKxJjntxQjCo75Egao+xMcPkrv0rFUtNYpaEZyyDA6lXpfhNSwB+pTEAPbOmvhl8oOvuL05P77IYNWum8aUR92ibtSLptTdMsPYnlB6rvYogsovFWG1uwtFowOQDXmd4Oc6ibpanamNjsIAVXmfUVNYksg1bIl17uZQSIU2LdM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759251687; c=relaxed/simple; bh=fEgqTioolEbToOXjQJrRCpCLI4LQWJGUzbSrefxtzSA=; h=Message-ID:Date:From:To:Cc:Subject:References:MIME-Version: Content-Type; b=fdMkD2HM86AZIVe5I8G3S1uQaMVoxwJ1+NNNi+d8zYS/8WUHMg+NrEUY1NLIt89O41bZFNT08EiAtRIm6s3qxm9qVIFQ9ey+AB0ZxdCV5Cf9gulirx/5Qfe1WMPoBBwd1wRE0ATumL5bV8DZNKuVoIrsMEpEQMinU1iGtY/A6YI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PQPadHFh; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="PQPadHFh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E0BADC116C6; Tue, 30 Sep 2025 17:01:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1759251686; bh=fEgqTioolEbToOXjQJrRCpCLI4LQWJGUzbSrefxtzSA=; h=Date:From:To:Cc:Subject:References:From; b=PQPadHFhMBXFKAf87cL/RsSQQ8IQ34NsH/LadOLHClSbsQef49+iuoKhw0S6Sv9R3 GZaNOmdKvjPgcedNcavW7Rnj7NLBydwkIaQS7axi+JjzlZBQWxlqsAHLHOA+gNht4O FU6vv1bjhZ0/3RkyVdY9r7xkyfMJEaaseUFJX1UcAI0gFg0xuPGGKEy5i2JVP8pz6d iQKQutVzfli2jCcjaOHA+evJzI8iPPSO7Y5KvQNweiQLzHG61iS98cytix73mykzIa SVOPg62LOvYTEZjJUqkydjica9BZN0f+/HfXMYfSfw3d/oIUNr/cGOSEEGIVeOsS9V bE4+V470gcOjg== Received: from rostedt by gandalf with local (Exim 4.98.2) (envelope-from ) id 1v3dkl-0000000DIKJ-07Jd; Tue, 30 Sep 2025 13:03:03 -0400 Message-ID: <20250930170302.878862549@kernel.org> User-Agent: quilt/0.68 Date: Tue, 30 Sep 2025 13:01:45 -0400 From: Steven Rostedt To: linux-kernel@vger.kernel.org Cc: Masami Hiramatsu , Mark Rutland , Mathieu Desnoyers , Andrew Morton , =?UTF-8?q?Michal=20Koutn=C3=BD?= Subject: [for-next][PATCH 10/11] tracing: Ensure optimized hashing works References: <20250930170135.285740909@kernel.org> 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" Content-Transfer-Encoding: quoted-printable From: =3D?UTF-8?q?Michal=3D20Koutn=3DC3=3DBD?=3D If ever PID_MAX_DEFAULT changes, it must be compatible with tracing hashmaps assumptions. Cc: Masami Hiramatsu Cc: Mathieu Desnoyers Link: https://lore.kernel.org/20250924113810.2433478-1-mkoutny@suse.com Link: https://lore.kernel.org/r/20240409110126.651e94cb@gandalf.local.home/ Signed-off-by: Michal Koutn=C3=BD Signed-off-by: Steven Rostedt (Google) --- kernel/trace/trace_sched_switch.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/trace/trace_sched_switch.c b/kernel/trace/trace_sched_s= witch.c index 518dfc74347a..c46d584ded3b 100644 --- a/kernel/trace/trace_sched_switch.c +++ b/kernel/trace/trace_sched_switch.c @@ -247,6 +247,8 @@ int trace_save_cmdline(struct task_struct *tsk) if (!tsk->pid) return 1; =20 + BUILD_BUG_ON(!is_power_of_2(PID_MAX_DEFAULT)); + tpid =3D tsk->pid & (PID_MAX_DEFAULT - 1); =20 /* --=20 2.50.1