From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (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 93840307AE3 for ; Mon, 13 Jul 2026 10:31:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783938672; cv=none; b=AS2ZjMdnOH1AP+zdRbR/9iX1ChTNwhPNS5jbJCdEYX9jR7cvMeQAZlFmijX38tIbcUMnfkN2mt5QCl3LmXE/vOvQBDeJSeg6gGbqiHzFZAyC5xYounMb8f1gslxMcEKSeGJxJ/o4FiZOTcgsg5PAxyagKDAb44KfP+5yIFFtqQw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783938672; c=relaxed/simple; bh=wh+uN6f3eO+lPJjDVHzrHbfBrUFxnl6jt5FYXiT10E4=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=KJiPHeqSRVc7NNPmh5/uupeSUrZSMaKoE5QrS9CFXJ1aCWHyI+qMTOGC1szgPANCSkF8H26cDigIUoPJOxQ7JwHIGphSC50k17ORtIAfEl3N8bAGvmWlAh5V1gpO/ngMG9gOnV8mR3df6IX2T3QitiiPK+lQ/K+s8PMav7xc7O4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=S6P/q8Mz; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=oW662zGa; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="S6P/q8Mz"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="oW662zGa" Date: Mon, 13 Jul 2026 12:31:07 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1783938669; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=TnTJYFd3ykPUbgMhCghpq45CT2aJ0C3b7XhF03Le8p8=; b=S6P/q8Mz5yWsNUY5WzF0O+VnLj1I1ew+amkReHeJKEUerqSdIMEz4nWCu1mytvMQU1yKMX g1VSUTT4rGQqWc7FJiGY7/aYfpYGEVWj0v51mYXEgmHXsMaqKQxZ4bxXx7TkE5VyOrTh/F ZxcVGRs4gixKNXFo5mnKT8uqKf5uA2KBpSSSudNcT947IQNs2MXhRCkZMEFpJZ/+nLQL0Z 6AaHEROInIKVwtyGFY4iizezFZoJrtvkRFd11nMcKW1AS+tj0qNfGZh0m/dlnCYrOBYWxy aZ9fnW7b3CWmgCm3/cQYr+Mu9QMmsZlqIqOpR0dKP1F4FWAmozYsZusya13x7g== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1783938669; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=TnTJYFd3ykPUbgMhCghpq45CT2aJ0C3b7XhF03Le8p8=; b=oW662zGaP8R/BKUNGQf5ru8cvBBiUuVwpzd3+LGgmrof7ZHUE82UmEhFCNSCZRuOqnB+0N Mfkzbp8VobvzFnDQ== From: Sebastian Andrzej Siewior To: Marek Szyprowski Cc: Krzysztof Kozlowski , Peter Griffin , Alim Akhtar , Daniel Lezcano , Thomas Gleixner , "Uwe Kleine-K.nig" , linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-pwm@vger.kernel.org, linux-rt-devel@lists.linux.dev Subject: Re: [PATCH] clocksource/drivers/samsung_pwm: switch to raw_spinlock_t type Message-ID: <20260713103107.Yc-I0-xh@linutronix.de> References: <20260713085653.1145015-1-m.szyprowski@samsung.com> Precedence: bulk X-Mailing-List: linux-rt-devel@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20260713085653.1145015-1-m.szyprowski@samsung.com> On 2026-07-13 10:56:53 [+0200], 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 Reviewed-by: Sebastian Andrzej Siewior Sebastian