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 32CFBC5DF8C for ; Mon, 24 Aug 2026 02:35:04 +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:Content-Transfer-Encoding: MIME-Version:Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-Type: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=IezcPm/w1H51NUj483GCchWdwy2v1RZMRZdYjbHqVB8=; b=lqMf+aG5og/G3daRbVX4l267PY owPQYsmffy2PJeCavPrybnWHAfrpBGbN4nlfT3XZxKogT5nzqqlT8AAXV4HNmKV2R83mw8CZCA76Y tb6kdOzPHOElXsgltQTe37EfaIAJNqD0wonXVaxVr+mYdY9hRnmNo03CYFsHNYbmtJFv6IosCugc6 VISIWRna8J9u5ELt/wJkBeKTmEmHHHo7Rqa6VJEMZEIu25iY1vGCk9zCUr/8/zBm6g76Ewn8BV9rR rr4sFrMrcUP1b0mxfK7saCr44FgwfuXlfHcBjZ5HSSNrC3I10nZxXgI+PGjnjV6cCJ+vwVSBe/Y+3 qn+jaQ3w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wyKWS-0000000Fo9W-0xlc; Mon, 24 Aug 2026 02:34:52 +0000 Received: from m16.mail.163.com ([117.135.210.4]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wyKWP-0000000Fo9D-17Ib for linux-arm-kernel@lists.infradead.org; Mon, 24 Aug 2026 02:34:51 +0000 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 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-Originating-IP: [39.144.104.151] X-CM-SenderInfo: dolyvlxnhu0vro6rljoofrz/xtbC3BEVjWqLrbHRBQAA38 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260823_193449_749971_5DE7D0E6 X-CRM114-Status: UNSURE ( 8.14 ) 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 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