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 B0DC13E2760; Mon, 13 Jul 2026 10:49:13 +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=1783939754; cv=none; b=WwqWWiuaaVTi2WYUvDB8rCXdREV8Xjt45cuaVIV6PtoxLUo1lakauoYt+gCTbp3OsgE62pnxkBlVb2PbOpdzBbB8l6AFzgVIGfv+NYoKOeCBUHRoXi1zbnJK2VTX0ZZespGMw5Mc8DzYVH3Gck/ViAgfEccORqzp3hcCoIZ0E4s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783939754; c=relaxed/simple; bh=871mWuTdgyP3R57FPRq7LjxpeZsKCQyEXijDMwptQ7s=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=f08c5FIkiQRpywS3kcvobrkXk2nnAgrkGXhar7/c6Mk2z6cVwcOeK259y3IXlkoHJNWutw+cR/qSwMP0wLMrjeGn/LeTbjxcu4E27EAfzgCjdKprUkwx25tl9ny5k0OJdCmBHZ4aGt8GN7IZaP2A1diNlenH/LWxRKwTDpcZsuQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=jjgt6sRN; 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="jjgt6sRN" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 381E11F00A3A; Mon, 13 Jul 2026 10:49:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783939753; bh=yemFsxcMX2PkimHJhyzPnr2Dgwc9KrDtU7p2i1cqlJY=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=jjgt6sRNuxYg0CwEO7+h57lI9MZA6iOkZUZif8PLLFh7R7K7RjZwx1x1aTT/5dXfH BiyErAmDIEIIOGrC9fwZGxOwIjMkd1yRtQ0Fe+vZ8wDKSkKF+AX8+zXReBMZMe5obf N0/wPIxw0Oi4g484nXIp4IHHh/SWeIIm5KI7zNyZjoxWLkkY4CxNy91Or4eTUGiS6Q 9rtxI77jn0AsdFPLdMrLq1d3IgaIOXqF6hUMpq7y7JA3ZAEkiJrE3wzvVZG4CwWwcR YpAgIwTT4/r3TS3adtDUDQ1al4IpriK+0gXJ1ZDuK3taIUdh9IUCbew3iu5XDvJiqP TUjR1jWzbLP3A== Message-ID: <2b078b70-1e8d-4e0e-9ad3-25e53057470e@kernel.org> Date: Mon, 13 Jul 2026 12:49:06 +0200 Precedence: bulk X-Mailing-List: linux-pwm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] clocksource/drivers/samsung_pwm: switch to raw_spinlock_t type To: Marek Szyprowski Cc: Peter Griffin , Alim Akhtar , Daniel Lezcano , Thomas Gleixner , "Uwe Kleine-K.nig" , Sebastian Andrzej Siewior , linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-pwm@vger.kernel.org, linux-rt-devel@lists.linux.dev References: <20260713085653.1145015-1-m.szyprowski@samsung.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 13/07/2026 10:56, Marek Szyprowski wrote: > Samsung PWM timer might be used as a clock source on some legacy systems. > When PREEMPT_RT is enabled on ARM, regular spinlock is converted to a > sleeping lock (mutex-based), which must not be used in atomic context > such as hard interrupt handlers. Switch the samsung_pwm_lock to the > raw_spinlock, which remains a true non-sleeping spinlock even > under PREEMPT_RT. > > Fixes: 7aac482e6290 ("clocksource: samsung_pwm_timer: Make PWM spinlock global") > Fixes: f11899894c0a ("clocksource: add samsung pwm timer driver") > Signed-off-by: Marek Szyprowski > --- > This fixes the following warning observed during boot, when > CONFIG_PROVE_RAW_LOCK_NESTING is set: > > clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns > Exynos4210 clocks: sclk_apll = 800000000, sclk_mpll = 800000000 > sclk_epll = 96000000, sclk_vpll = 108000000, arm_clk = 800000000 > > ============================= > [ BUG: Invalid wait context ] > 7.2.0-rc1 #13178 Not tainted Looks correct. Pieces of the warning could be in commit msg, but anyway: Reviewed-by: Krzysztof Kozlowski Best regards, Krzysztof