From nobody Mon Sep 29 20:16:00 2025 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A279CC32767 for ; Mon, 15 Aug 2022 22:38:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1350983AbiHOWhZ (ORCPT ); Mon, 15 Aug 2022 18:37:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52602 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348982AbiHOWaP (ORCPT ); Mon, 15 Aug 2022 18:30:15 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E06B470E4B; Mon, 15 Aug 2022 12:48:10 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 0274761269; Mon, 15 Aug 2022 19:48:10 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E77C9C433C1; Mon, 15 Aug 2022 19:48:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1660592889; bh=v+8BW4sU+DYYuLIMxucs4tnKqWv7E/wqEuADuGahClE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TsjIcO4LyXuwSbDNaLBSTUOy2u5KgYZS0zI+u1Dj7GcdLKxEWXLOSEUmJ/JMwXgJ3 zsXxm85oTOBwf0IYrpav5R5RbizTm+bTLn2qeFGK/JXMBfmkvmRUjdXTaMqEXQ9CgP pIZAMAzcgzfJa9Py251u8+Ib5f7SCKYCquXiR8Tc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mark Rutland , Andrey Konovalov , Will Deacon , Sasha Levin Subject: [PATCH 5.19 0150/1157] arm64: stacktrace: use non-atomic __set_bit Date: Mon, 15 Aug 2022 19:51:46 +0200 Message-Id: <20220815180445.663554581@linuxfoundation.org> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220815180439.416659447@linuxfoundation.org> References: <20220815180439.416659447@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Andrey Konovalov [ Upstream commit 446297b28a21244e4045026c4599d1b14a67e2ce ] Use the non-atomic version of set_bit() in arch/arm64/kernel/stacktrace.c, as there is no concurrent accesses to frame->prev_type. This speeds up stack trace collection and improves the boot time of Generic KASAN by 2-5%. Suggested-by: Mark Rutland Acked-by: Mark Rutland Signed-off-by: Andrey Konovalov Link: https://lore.kernel.org/r/23dfa36d1cc91e4a1059945b7834eac22fb9854d.16= 53317461.git.andreyknvl@google.com Signed-off-by: Will Deacon Signed-off-by: Sasha Levin --- arch/arm64/kernel/stacktrace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c index c246e8d9f95b..d6bef106e37e 100644 --- a/arch/arm64/kernel/stacktrace.c +++ b/arch/arm64/kernel/stacktrace.c @@ -117,7 +117,7 @@ static int notrace unwind_next(struct task_struct *tsk, if (fp <=3D state->prev_fp) return -EINVAL; } else { - set_bit(state->prev_type, state->stacks_done); + __set_bit(state->prev_type, state->stacks_done); } =20 /* --=20 2.35.1