From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from m16.mail.163.com (m16.mail.163.com [117.135.210.4]) (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 A2A07357D0C for ; Mon, 24 Aug 2026 02:35:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=117.135.210.4 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787538911; cv=none; b=Z9V7+IoLvm9vQaEAwsYPkl+3b9DL7Tv0qTH/SkcfCFHgUZ2NuuOMPY2sLrJTyo92wNutW1jDdnmTT5zX2ubQVMHSDoSPlljp06Q4t2PEhiMzAQP4xPVhTm3773eY2Tp0nxHx5LOqZuZdQMyFMs+7JqXEfjvuJe3/F4fSvUhTlV0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787538911; c=relaxed/simple; bh=bkNfaIRQC3Vf3auZCoAqePLtwswXu0oCaPMczk26VBc=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=gQRCXV7YK+1dFqqejapF2E0s0Uu9OyhkDeqJYgMQb6wk2HJKtEARMSZ0Hh43ktGSZ43Mq1IEbHvVoAAzeWgxuOt6oS8su9u1CUxdRKZLMUlEGLJ1N++fGtnXVaNW8MX/3qwQ2JTCgUqP2ZGZsRTOtnf6tHyja5bVd0S+b4e6Brc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b=lS5Y+NJN; arc=none smtp.client-ip=117.135.210.4 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=163.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="lS5Y+NJN" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=Ie zcPm/w1H51NUj483GCchWdwy2v1RZMRZdYjbHqVB8=; b=lS5Y+NJNfcgAJkixPh c97MnDBxNJbL+oo+nUiQ7s0bFubzBeRHO0t0exQli0vLy0TLwsF1TXCJC7Iub2kz c6xi8kOR2RBXanGhFPLWJXvoiQYQ/BMhXuxuPiO+1Ya6cm4cSf5bmeEj0yKlBcPI m1QMmmbwiclR5Lt/AVENFe+Ko= Received: from DESKTOP-93MEKVV.localdomain (unknown []) by gzga-smtp-mtada-g0-3 (Coremail) with SMTP id _____wD3_RevrYtq2x_PRA--.43442S2; Mon, 24 Aug 2026 10:34:25 +0800 (CST) From: Li Dou To: maz@kernel.org Cc: tglx@kernel.org, radu@rendec.net, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, li8d6kernel@163.com Subject: [PATCH] irqchip/gic-v3: Remove the ISB between AP0Rn and AP1Rn Date: Mon, 24 Aug 2026 10:34:03 +0800 Message-ID: <20260824023403.1312-1-li8d6kernel@163.com> X-Mailer: git-send-email 2.43.0 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-CM-TRANSID:_____wD3_RevrYtq2x_PRA--.43442S2 X-Coremail-Antispam: 1Uf129KBjvdXoW7Jr1UXrykKw17Kw1DCFy8Krg_yoW3KFc_ur WjqFsxWFZ2k3yrK3ZFkrnrZryFvas5Wr93WF12yFn3J34xuw4xur17ZFy5Jan8WFs2qr97 GFZ8ur1IvrW7GjkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7sRi8n5tUUUUU== X-CM-SenderInfo: dolyvlxnhu0vro6rljoofrz/xtbC3BEVjWqLrbHRBQAA38 ARM GICv3 specification says(in section 4.8.4 "System register access to the Active Priorities registers"): an ISB is not required between each write to ICC_AP0R_EL1, Secure ICC_AP1R_EL1, and Non-secure ICC_AP1R_EL1. It means we can use one ISB after resetting AP0Rn and AP1Rn for context synchronization. So just remove the previous one. Signed-off-by: Li Dou --- drivers/irqchip/irq-gic-v3.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c index 6e1fa5b247fc..3c48f46abb25 100644 --- a/drivers/irqchip/irq-gic-v3.c +++ b/drivers/irqchip/irq-gic-v3.c @@ -1205,8 +1205,6 @@ static void gic_cpu_sys_reg_init(void) case 4: write_gicreg(0, ICC_AP0R0_EL1); } - - isb(); } switch(pribits) { -- 2.43.0