From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794272850; b=H+aMKZEypZBqpVQjOFwDxs8HXurDjWwjHddNjTAm9VPJaZEbF36/CdGABKWKqOaXBXP1 ri1vD22SgVO15xLlMw+wOADC4Q4EwWzB1YjteA+GzdbeOVfowM/m/J9TyFzHixzzAGd5A vgELbQMVZDunhSSu6qrbi9k4ZhKNWj441JXC6/alojxymvpIti/Q69NeogF4WuxwH+mZk IKqzk0HwhOHswLZSfFjMnQdUi91IyBq0GoWWkWbUSJcOMeLDNROJXSInSRM09eifHDxEi fZ0Y9N3m+BlUhkFN6/HMk+bJSJY83DuNsEd5/gfCm7T2on0Bvdbhtnft/LPW5dY85sQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794272850; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: MIME-Version:Content-Type:Content-Transfer-Encoding; bh=UtmCFb9JL7fe3frhb04qC12nyyK7aM3g11oGbjYRuTc=; b=UzyNFfrwUpf9AdSqDhU+XyAK3LT8o/vN7tN1W5mnavhzA/pWcqXeiTfET82f8HJULO4U adWjiZVfnq5jlak3VeRswbUP9qj69NvqLLBbDTkj/Te5t8EpmWplPLTrzSSYAQsjkT9y3 oSsLEkhUEU2Go1DDTAkuCN1SVT/ys/mEnlWZpy0Y3xpY2U64eEQFRIS/Mbuw3CO3vhCUL vqDH5yj4BEGlguBPzvY9z3l2NcjiWGSbJhNZzT8eMIEkwrehh8lFehhmc2draYaBo6H51 zcMynRml59pQZI7X+K5kyTdz+uTqqqFR1eQWXryT3hzt0pGxthJBQS6t77/3obQWmmQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=Neln7oU7; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1C056606A31C for ; Tue, 10 Nov 2026 01:07:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=Neln7oU7 Received: by smtp.kernel.org (Postfix) with ESMTPSA id 745DE1F0089F; Tue, 10 Nov 2026 01:07:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794272850; bh=UtmCFb9JL7fe3frhb04qC12nyyK7aM3g11oGbjYRuTc=; h=From:To:Cc:Subject:Date; b=Neln7oU7ZZD1FDO7D2VS/JYeVXt8vvxluBkiG59DqTxlrkgn1WTUPK4dSxbtuThBG vTKIZziPv9nq4G0D+2kQQEsckCw8jmFwZsl7COJ1uvvfiIzn2NsLAii5zSwVqqPj+o YKgg3/W1Y3zlF9R7IP5M1oFFaQFMbyC7/BToUowWewUvd+FIBwSzrL3YTTQVYqBZYj sRhptnUBEFYq7wNWzHAqhUQVxVL0vcXaPhBrfNObpaGXvtm7fBRAg7umE//t4oug1e SJlv4vONHuL9D7vPWU/iDPDbS7+aN2tFmQi2Mmf+A8pmBE95FsZhBeFv5ugw/Dc/n+ qObn1hRv88dQA== From: Sasha Levin To: linux@roeck-us.net, sashiko-bot@kernel.org, ycistak@gmail.com Cc: stable@vger.kernel.org Subject: FAILED: patch "[PATCH] hwmon: (coretemp) Fix 32-bit jiffies wraparound in show_temp()" failed to apply to 6.12-stable tree Date: Mon, 9 Nov 2026 20:07:28 -0500 Message-ID: <20261109200728-failed-6.12-9a6aa085c94c@kernel.org> X-Mailer: git-send-email 2.53.0 X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The patch below does not apply to the 6.12-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.12.y git checkout FETCH_HEAD git cherry-pick -x 9a6aa085c94c7f2817c4d50a7264e6fb51286f40 # git commit -s git send-email --to '' --in-reply-to '20261109200728-failed-6.12-9a6aa085c94c@kernel.org' --subject-prefix 'PATCH 6.12.y' 'HEAD^..' Thanks, Sasha ------------------ original commit in Linus's tree ------------------ >From 9a6aa085c94c7f2817c4d50a7264e6fb51286f40 Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Sat, 31 Oct 2026 03:09:14 +0000 Subject: [PATCH] hwmon: (coretemp) Fix 32-bit jiffies wraparound in show_temp() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit show_temp() rate-limits MSR reads by storing tdata->last_updated as an unsigned long and comparing it against jiffies using time_after(jiffies, tdata->last_updated + HZ). time_after() relies on signed long subtraction, which only produces the expected result while the two timestamps are within LONG_MAX jiffies of each other. On 32-bit kernels, if tempX_input is not read for more than LONG_MAX jiffies (~24.85 days at HZ=1000), the signed difference flips sign and time_after() evaluates to false. Because tdata->last_updated is only refreshed when time_after() succeeds, subsequent reads remain blocked from refreshing for another ~24.85 days until jiffies wraps past tdata->last_updated + HZ again, returning either a stale cached temperature or -ENODATA if the sensor had never been read since initialization. Store tdata->last_updated as a u64 and use get_jiffies_64() with time_after64(), which does not wrap in any practical uptime. Reported-by: Sashiko Fixes: bebe467823c0 ("hwmon: New coretemp driver") Cc: stable@vger.kernel.org Tested-by: Asaf Nuri Bertizlioğlu Signed-off-by: Guenter Roeck --- drivers/hwmon/coretemp.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c index 7fced0e2abeba..96d57fe12de6d 100644 --- a/drivers/hwmon/coretemp.c +++ b/drivers/hwmon/coretemp.c @@ -76,7 +76,7 @@ struct temp_data { int temp; bool temp_valid; int tjmax; - unsigned long last_updated; + u64 last_updated; unsigned int cpu; int index; u32 cpu_core_id; @@ -407,7 +407,7 @@ static ssize_t show_temp(struct device *dev, mutex_lock(&tdata->update_lock); /* Check whether the time interval has elapsed */ - if (time_after(jiffies, tdata->last_updated + HZ)) { + if (time_after64(get_jiffies_64(), tdata->last_updated + HZ)) { tjmax = get_tjmax(tdata, dev); rdmsrq_on_cpu(tdata->cpu, tdata->status_reg, &val.q); /* @@ -417,7 +417,7 @@ static ssize_t show_temp(struct device *dev, */ tdata->temp_valid = (val.l >> 31) & 1; tdata->temp = tjmax - ((val.l >> 16) & 0xff) * 1000; - tdata->last_updated = jiffies; + tdata->last_updated = get_jiffies_64(); } valid = tdata->temp_valid; @@ -521,11 +521,8 @@ init_temp_data(struct platform_data *pdata, unsigned int cpu, int pkg_flag) tdata->cpu = cpu; tdata->cpu_core_id = topology_core_id(cpu); tdata->attr_size = MAX_CORE_ATTRS; - /* - * A zero timestamp does not look stale on 32-bit, where jiffies - * starts just short of wrapping. Backdate it instead. - */ - tdata->last_updated = jiffies - HZ - 1; + /* Backdate to force a refresh on the first read */ + tdata->last_updated = get_jiffies_64() - HZ - 1; mutex_init(&tdata->update_lock); return tdata; } -- 2.53.0