From mboxrd@z Thu Jan 1 00:00:00 1970 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 918FC283FCF; Wed, 21 Jan 2026 23:11:45 +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=1769037105; cv=none; b=LQ4NenhyddzNXLRkUTREgE15Ign6u8KKwcUWs0L/PTZAZLtsUPGkpd4lyF8hSUjPf4hTDDJAKL9ctTKuijWsQo8HgpWKs0BMNssyjY/ooLPg4rbEabgd16K18+MqRiY90W+NdQ7stZ5QRm6L1DvbTWNzmbfqtT47bw7h3Uwo+ps= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769037105; c=relaxed/simple; bh=JX5WU4Je5PL4G6Kt3cgUEAGhcdZNfdPIwVIt7Qn3DNM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ZR7MkqQSgSULPNo9Fi/P27qAMwL/5IMB30U68vKud8UuiNPUdhFNKTHVMpJy6SUngEJGI2yetJvrgg5gRrlC6nfdAUOFlja5qF2v1quHRJYCyrisCfCwJdHh9j1d1nIN+kufA7RZgihWN90ZhohjdgvthXGXoIovTp+VRSeBKT0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=bEQNEeyQ; 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="bEQNEeyQ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6CA23C4CEF1; Wed, 21 Jan 2026 23:11:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1769037104; bh=JX5WU4Je5PL4G6Kt3cgUEAGhcdZNfdPIwVIt7Qn3DNM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bEQNEeyQccJNFuH4N1AW5KtmIdGUGORI+HYU920eeQKMiXI81FrvmwuGNguE+6Co4 M4ARAU+EDfICKv6CRYXvLcMkfwHTrsZyXAEX3RCn2b74c4QMbdx9tukzmFMJ5geQUK R2ziqio2t/8fy3eE5pS/hZ8DU8Iy7jwTOCCYR5dMKjVQLupS9xu9r08fVFcEq2leSU 5vaRs7akxZmDu0qC11SFgCnVxuUQrnJtPQXjkI7CluEfrZ27HQ9VoW4H6oKCPEK42U VHdBbGQSrqL5n2vt8Y34iWvdFghTWad/eQs6DiNlFXiEUiVQii8Knxr/NXujTghQ28 9CQFY7fopAbXA== From: Tejun Heo To: linux-kernel@vger.kernel.org, sched-ext@lists.linux.dev Cc: void@manifault.com, andrea.righi@linux.dev, changwoo@igalia.com, emil@etsalapatis.com, Tejun Heo , Ingo Molnar , Peter Zijlstra Subject: [PATCH 03/34] sched/core: Swap the order between sched_post_fork() and cgroup_post_fork() Date: Wed, 21 Jan 2026 13:11:09 -1000 Message-ID: <20260121231140.832332-4-tj@kernel.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260121231140.832332-1-tj@kernel.org> References: <20260121231140.832332-1-tj@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The planned sched_ext cgroup sub-scheduler support needs the newly forked task to be associated with its cgroup in its post_fork() hook. There is no existing ordering requirement between the two now. Swap them and note the new ordering requirement. Signed-off-by: Tejun Heo Cc: Ingo Molnar Cc: Peter Zijlstra --- kernel/fork.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/kernel/fork.c b/kernel/fork.c index b1f3915d5f8e..726d3ccad15b 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -2461,8 +2461,12 @@ __latent_entropy struct task_struct *copy_process( fd_install(pidfd, pidfile); proc_fork_connector(p); - sched_post_fork(p); + /* + * sched_ext needs @p to be associated with its cgroup in its post_fork + * hook. cgroup_post_fork() should come before sched_post_fork(). + */ cgroup_post_fork(p, args); + sched_post_fork(p); perf_event_fork(p); trace_task_newtask(p, clone_flags); -- 2.52.0