From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 6E0A93C199A for ; Fri, 8 May 2026 09:42:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778233331; cv=none; b=Y7HXQfbp03Sa216U+guemPD2MuPAhVR+4N1VqCQmli8AdLFgPqY1XvpUILrx0LG5mGdKvaWx6s+xE/YZv6N4RT0LRMCBYpzsYAqOadC0nb2/NypYJiqgOaheEFuyVnsNo0SeNQnX7vo3tn5ruBhIKulyn0b7syVFUG5ZjO5ioWY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778233331; c=relaxed/simple; bh=gZfp7AFUDRuKyFzNq7gSRxIUj7Mf0Qt8SSGk362fa3U=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=XL1bAjpg3AZITVGwO/PIA8stHNo/i/9lbxJp55Ws+WpUOdSFEWNGDrzphCeXIgTRL+jq5PrkKKNB8Y5z3loRtAJpmh1AbM/iX+bt80UUdeG4z/QOF+kyQigT8zguxkEBD5PM2sljGLYxlvUNd3EKPa8TwfGyCAz6SlpduRRhuo4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=pY9kvXnG; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="pY9kvXnG" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4B62DC2BCB8; Fri, 8 May 2026 09:42:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1778233331; bh=gZfp7AFUDRuKyFzNq7gSRxIUj7Mf0Qt8SSGk362fa3U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pY9kvXnGRso1B/12FM9wMLIIKOCuq1HszrTPq8bf6Mhfbmv8FSqm5Z2susf9fDC5z WDa8Og42BNii1l9w1zeF++GNWEg4BV/1UIoXC6Q6YTsVzE2nQEXlv1qvDO4EV4/Zww xDWJdkD6pkv56mHOn79/Qw8mmUGgtTxGhzMPdu/8q67Qz/tCGZ0wGGvzDCiOY1gkzA oDwTHvrAamg0zw150QYLRdJGgDO1AQsZB/XY3kcAvQVXE/0XhAHS3oQwcr1fHOSHkc Sx/Ox6BW0Q5jkkjIegShPFWs0YXs7QEWU8Kk77S97wMACk+hFQ5XWE4sXHiQL8u423 lekvwz9rJkBdA== Received: from sofa.misterjones.org ([185.219.108.64] helo=valley-girl.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1wLHij-00000000HJz-29OQ; Fri, 08 May 2026 09:42:09 +0000 From: Marc Zyngier To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Catalin Marinas , Will Deacon , Mark Rutland , Thomas Gleixner , Ben Horgan , Daniel Lezcano Subject: [PATCH v2 5/5] arm64: Convert __delay_cycles() to arch_timer_read_vcounter() Date: Fri, 8 May 2026 10:42:03 +0100 Message-ID: <20260508094203.2913880-6-maz@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260508094203.2913880-1-maz@kernel.org> References: <20260508094203.2913880-1-maz@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com, tglx@kernel.org, ben.horgan@arm.com, daniel.lezcano@linaro.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Relax the need for disabling preemption in __delay_cycles() by using arch_timer_read_vcounter(), which will disable preemption only when this is actually required. Signed-off-by: Marc Zyngier --- arch/arm64/lib/delay.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/arch/arm64/lib/delay.c b/arch/arm64/lib/delay.c index e278e060e78a9..a667df920697d 100644 --- a/arch/arm64/lib/delay.c +++ b/arch/arm64/lib/delay.c @@ -32,10 +32,9 @@ static inline unsigned long xloops_to_cycles(unsigned long xloops) * Note that userspace cannot change the offset behind our back either, * as the vcpu mutex is held as long as KVM_RUN is in progress. */ -static cycles_t notrace __delay_cycles(void) +static cycles_t __delay_cycles(void) { - guard(preempt_notrace)(); - return __arch_counter_get_cntvct_stable(); + return arch_timer_read_vcounter(); } void __delay(unsigned long cycles) -- 2.47.3