From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 45EACC43458 for ; Mon, 13 Jul 2026 10:31:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=TnTJYFd3ykPUbgMhCghpq45CT2aJ0C3b7XhF03Le8p8=; b=R+onfIidKeqx4e9vna5R34tXnU lmHfNu1VYMaKq4XDqkMHTTPpg/NGsOp70dETJ8m+RHTNI0wbkkKOFtOBX5nU8dotyqZ7vbTOdrHxt 1dOaZO/JTYdRFW+qNS6Aw2fIKqmyF0ZzHCJFzpbrBZcP0GNlVfxC+FikWyOIPlDZJPnzcH1/nCfTz H89J2Gm0wFIlqZ8YgWCvdLT9WBWkzuzzFgfOuAt9k9HCru2p94BNUteQaDVpz+zuEV0HX3eO7ZNSQ qhGKGAk1yaw8Dev9rZNnLUHYClLhZ63sCXFKX6C2/ZMSHvdxw1wowOACqECpgkdRHdcLn8LaGJCG+ icoV+2KQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wjDwT-00000008tUO-2epM; Mon, 13 Jul 2026 10:31:17 +0000 Received: from galois.linutronix.de ([193.142.43.55]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wjDwQ-00000008tTO-06o0 for linux-arm-kernel@lists.infradead.org; Mon, 13 Jul 2026 10:31:16 +0000 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> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20260713085653.1145015-1-m.szyprowski@samsung.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260713_033114_214313_668A999E X-CRM114-Status: UNSURE ( 7.38 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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