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 X-Spam-Level: X-Spam-Status: No, score=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 44AACC433E2 for ; Mon, 31 Aug 2020 18:20:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 27E1220E65 for ; Mon, 31 Aug 2020 18:20:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598898007; bh=/nk8YeCMjNJjnS7CPKyiXGuR1+ViXtq3As9PVWEq2iA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=zjLGuLnge+14Wpwz/ubpY43Zm3bShl+Z44H5rm4i6vClcPSP1z6PxngeJBTg84A2k uGSw39vH8fLcH/PjHUbJiHdZbI29S5jySxMaQhBqyuII3mpCeZxXuaAdgTxoR7xUXl DrdorvpvTR1TYL3ZI4m6rTbf3mGAwm7Vyl+DM97k= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729762AbgHaST5 (ORCPT ); Mon, 31 Aug 2020 14:19:57 -0400 Received: from mail.kernel.org ([198.145.29.99]:51858 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729508AbgHaSSI (ORCPT ); Mon, 31 Aug 2020 14:18:08 -0400 Received: from paulmck-ThinkPad-P72.home (unknown [50.45.173.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 92A81216C4; Mon, 31 Aug 2020 18:18:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598897888; bh=/nk8YeCMjNJjnS7CPKyiXGuR1+ViXtq3As9PVWEq2iA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nJhWq4AE2njLfb8NxwnF6sJXDxwmbVo20kr1BMrtvAMY3yIM1cTRe4VECRo8rpOIj 7JxKammAUU7qA2pyK39nzLzMcMwDpfRBN+I48tmdr9/tfpU/HLjHBArBWwrwfYUgpv D4Q92aEhyYStAAuZfi2Ve87TxQmSFsyCIv4e5Nis= From: paulmck@kernel.org To: linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, kernel-team@fb.com, mingo@kernel.org Cc: elver@google.com, andreyknvl@google.com, glider@google.com, dvyukov@google.com, cai@lca.pw, boqun.feng@gmail.com, "Paul E . McKenney" Subject: [PATCH kcsan 15/19] kcsan: Show message if enabled early Date: Mon, 31 Aug 2020 11:18:01 -0700 Message-Id: <20200831181805.1833-15-paulmck@kernel.org> X-Mailer: git-send-email 2.9.5 In-Reply-To: <20200831181715.GA1530@paulmck-ThinkPad-P72> References: <20200831181715.GA1530@paulmck-ThinkPad-P72> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Marco Elver Show a message in the kernel log if KCSAN was enabled early. Signed-off-by: Marco Elver Signed-off-by: Paul E. McKenney --- kernel/kcsan/core.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/kernel/kcsan/core.c b/kernel/kcsan/core.c index 99e5044..b176400 100644 --- a/kernel/kcsan/core.c +++ b/kernel/kcsan/core.c @@ -1,5 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 +#define pr_fmt(fmt) "kcsan: " fmt + #include #include #include @@ -463,7 +465,7 @@ kcsan_setup_watchpoint(const volatile void *ptr, size_t size, int type) if (IS_ENABLED(CONFIG_KCSAN_DEBUG)) { kcsan_disable_current(); - pr_err("KCSAN: watching %s, size: %zu, addr: %px [slot: %d, encoded: %lx]\n", + pr_err("watching %s, size: %zu, addr: %px [slot: %d, encoded: %lx]\n", is_write ? "write" : "read", size, ptr, watchpoint_slot((unsigned long)ptr), encode_watchpoint((unsigned long)ptr, size, is_write)); @@ -623,8 +625,10 @@ void __init kcsan_init(void) * We are in the init task, and no other tasks should be running; * WRITE_ONCE without memory barrier is sufficient. */ - if (kcsan_early_enable) + if (kcsan_early_enable) { + pr_info("enabled early\n"); WRITE_ONCE(kcsan_enabled, true); + } } /* === Exported interface =================================================== */ -- 2.9.5