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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 03F0AC6FA8E for ; Sun, 26 Feb 2023 03:42:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229689AbjBZDmH (ORCPT ); Sat, 25 Feb 2023 22:42:07 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50522 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229657AbjBZDmA (ORCPT ); Sat, 25 Feb 2023 22:42:00 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A969312857; Sat, 25 Feb 2023 19:41:59 -0800 (PST) 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 ams.source.kernel.org (Postfix) with ESMTPS id 532B9B80B7C; Sun, 26 Feb 2023 03:41:58 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 40E3CC4339E; Sun, 26 Feb 2023 03:41:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1677382917; bh=cgXsqvRQRvaZEZsK0JGL/4IxZHWbmdW7icg/Kv/1eqU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Cl+Vkb7hU7QywfL5otHVasNEHQqxfXpYNnhcm4JZY2pcsnt8WGTkYH6XYeV1Hfukb RcnmR0HV2tAM6e/+7ia4tPnGZfvQnDRk7nrV/s45aQGAPniUEmbJcYtQKezF6bzthL QuKaej+Guqx4se4jCGTYpsknfr1Sm97X5+sP9WTTLV76fluXsuA1b5+IcNaJeqXwFn Cl511maDGYF9LtKOY0T8W3ArlgxQP8Su0iPXIYQid1C+h4BqXeGgZp9EA0ph68PpyX /6G4qI7fGre906oS8L1W7RnhJNAttMjHfotq8+9kvZ71xqzMNOaQYh6OvmVSCHpYJI vfV1InYH0c6HQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Peter Zijlstra , Ingo Molnar , Sasha Levin , frederic@kernel.org, paulmck@kernel.org Subject: [PATCH AUTOSEL 6.2 04/21] context_tracking: Fix noinstr vs KASAN Date: Sat, 25 Feb 2023 22:41:33 -0500 Message-Id: <20230226034150.771411-4-sashal@kernel.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230226034150.771411-1-sashal@kernel.org> References: <20230226034150.771411-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Peter Zijlstra [ Upstream commit 0e26e1de0032779e43929174339429c16307a299 ] Low level noinstr context-tracking code is calling out to instrumented code on KASAN: vmlinux.o: warning: objtool: __ct_user_enter+0x72: call to __kasan_check_write() leaves .noinstr.text section vmlinux.o: warning: objtool: __ct_user_exit+0x47: call to __kasan_check_write() leaves .noinstr.text section Use even lower level atomic methods to avoid the instrumentation. Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Ingo Molnar Link: https://lore.kernel.org/r/20230112195542.458034262@infradead.org Signed-off-by: Sasha Levin --- kernel/context_tracking.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c index 77978e3723771..a09f1c19336ae 100644 --- a/kernel/context_tracking.c +++ b/kernel/context_tracking.c @@ -510,7 +510,7 @@ void noinstr __ct_user_enter(enum ctx_state state) * In this we case we don't care about any concurrency/ordering. */ if (!IS_ENABLED(CONFIG_CONTEXT_TRACKING_IDLE)) - atomic_set(&ct->state, state); + arch_atomic_set(&ct->state, state); } else { /* * Even if context tracking is disabled on this CPU, because it's outside @@ -527,7 +527,7 @@ void noinstr __ct_user_enter(enum ctx_state state) */ if (!IS_ENABLED(CONFIG_CONTEXT_TRACKING_IDLE)) { /* Tracking for vtime only, no concurrent RCU EQS accounting */ - atomic_set(&ct->state, state); + arch_atomic_set(&ct->state, state); } else { /* * Tracking for vtime and RCU EQS. Make sure we don't race @@ -535,7 +535,7 @@ void noinstr __ct_user_enter(enum ctx_state state) * RCU only requires RCU_DYNTICKS_IDX increments to be fully * ordered. */ - atomic_add(state, &ct->state); + arch_atomic_add(state, &ct->state); } } } @@ -630,12 +630,12 @@ void noinstr __ct_user_exit(enum ctx_state state) * In this we case we don't care about any concurrency/ordering. */ if (!IS_ENABLED(CONFIG_CONTEXT_TRACKING_IDLE)) - atomic_set(&ct->state, CONTEXT_KERNEL); + arch_atomic_set(&ct->state, CONTEXT_KERNEL); } else { if (!IS_ENABLED(CONFIG_CONTEXT_TRACKING_IDLE)) { /* Tracking for vtime only, no concurrent RCU EQS accounting */ - atomic_set(&ct->state, CONTEXT_KERNEL); + arch_atomic_set(&ct->state, CONTEXT_KERNEL); } else { /* * Tracking for vtime and RCU EQS. Make sure we don't race @@ -643,7 +643,7 @@ void noinstr __ct_user_exit(enum ctx_state state) * RCU only requires RCU_DYNTICKS_IDX increments to be fully * ordered. */ - atomic_sub(state, &ct->state); + arch_atomic_sub(state, &ct->state); } } } -- 2.39.0