From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 E49853B14DE for ; Fri, 17 Jul 2026 15:00:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784300413; cv=none; b=N2f1AP/GnIUqjMCy00Ua4NobKnk2ltwEYvZb1UlcK+rUseiyVGHVOGDdzAkqb5F0SYcebDnLU03GxxQ0NcKgRdeh/crDS8VYOhAXHZJ3inE2wL5kaREO8UvoSARC8H0+bDG4G52ydypK8/ROFJPQGmwOlIrFsos5HO0o6AIUY8c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784300413; c=relaxed/simple; bh=QevwcSnVi3oLt0BodbNa9KmTOaXaS31oo8aTcRMZrf4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=B6EMMZH7q4/SAoexVgHebh2g+d0HNkFG4raOKgwKBMLnIreReyXF0x4XywTwZwqxHGLIbRb2h9mNGVrCe25J4duMW2SUs1RshcwsnrPHu3/U2LWaVacup+XKKMor//T00aZb0Wy0Za4foswfVACaID9C9bAznv95C9rfefa0oLQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=VVqHeFM6; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="VVqHeFM6" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 52B601F00A3E; Fri, 17 Jul 2026 15:00:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784300409; bh=wYj6F6IYyuNKUd8WSg9JhPK9z69ufcNDyPg31vIgFAY=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=VVqHeFM6q+BkMg92sYaE4PoOAPYKOE6np2tfWQZAt/fg9Sardc62vPF/BxNhgxk0X DgFHtQvLaGZdYunMY4JKd7U3qu50nHcDaONtTeEsq3Ho4dzDbTiJpMpE9llgkAMGC7 UrYUvxioK2GbYzoZT5Y6t5i2A9urxH4h/fs8o2pheYWtvAVePLmd3N2RsDoniT2wQB hKzgdxy1qsQC7ugYdk6WYVxEkoEkH10xRHrqbOEt/KSsf/GS7alC5QGBq1tIsMxVKU aZx4oSCSmfirGJfu/pYiNd6GgS3Fh/pl/YSM9ka4MhRRtBwjYgjGONHuLAzoRiI9ew Qo8UzsB/2+HAA== From: Sasha Levin To: stable@vger.kernel.org Cc: Oleg Nesterov , "Peter Zijlstra (Intel)" , Sasha Levin Subject: [PATCH 6.1.y 2/3] seqlock: Change do_task_stat() to use scoped_seqlock_read() Date: Fri, 17 Jul 2026 11:00:06 -0400 Message-ID: <20260717150007.1930653-2-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260717150007.1930653-1-sashal@kernel.org> References: <2026071445-confusion-showing-c025@gregkh> <20260717150007.1930653-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Oleg Nesterov [ Upstream commit b76f72bea2c601afec81829ea427fc0d20f83216 ] To simplify the code and make it more readable. [peterz: change to new interface] Signed-off-by: Oleg Nesterov Signed-off-by: Peter Zijlstra (Intel) Stable-dep-of: 6650527444da ("proc: protect ptrace_may_access() with exec_update_lock (part 1)") Signed-off-by: Sasha Levin --- fs/proc/array.c | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-) diff --git a/fs/proc/array.c b/fs/proc/array.c index a3212f11a1b434..6c54ada35901ea 100644 --- a/fs/proc/array.c +++ b/fs/proc/array.c @@ -473,7 +473,6 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, unsigned long flags; int exit_code = task->exit_code; struct signal_struct *sig = task->signal; - unsigned int seq = 1; state = *get_task_state(task); vsize = eip = esp = 0; @@ -530,10 +529,7 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, if (permitted && (!whole || num_threads < 2)) wchan = !task_is_running(task); - do { - seq++; /* 2 on the 1st/lockless path, otherwise odd */ - flags = read_seqbegin_or_lock_irqsave(&sig->stats_lock, &seq); - + scoped_seqlock_read (&sig->stats_lock, ss_lock_irqsave) { cmin_flt = sig->cmin_flt; cmaj_flt = sig->cmaj_flt; cutime = sig->cutime; @@ -555,8 +551,7 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, } rcu_read_unlock(); } - } while (need_seqretry(&sig->stats_lock, seq)); - done_seqretry_irqrestore(&sig->stats_lock, seq, flags); + } if (whole) { thread_group_cputime_adjusted(task, &utime, &stime); -- 2.53.0