From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B4226606A323 for ; Mon, 9 Nov 2026 12:05:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=UmGxjTJH; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=EIiHA/jn 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:References:In-Reply-To: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:List-Unsubscribe-Post: List-Owner; bh=RuOhAvZnPjP1XPHFbitmFrHHdHIPhu/o1Rlh2k3boNo=; b=UmGxjTJH/jiUDf qGRbLwcxXOQF3vqq5RMLBODXo4vEJIK7jHPp6U+/T6SNjpRc5ACwKr87anGIGo1BYr/tSmdgaDet1 MBpu4opHxKybk2kug8fvaZAuEN47LlpA+S52NDV8vV/MO8y/ENelHxXWAgIFrZgjuMa1VWQpind79 w7KzMMng6YxOScbdRxsguUWRxusNMjPAksPzPnPHE40pkzAWjbgFL/9Bkz+xY+e5HEY/HKR+L7Pk4 Maof19z0Z5CQc4kYOS7BDkrttimYk2VibCRKtJW5HetgaoEWKFt8GwlOnX8pH7IjOsoDazEFzLMI7 xlIfPiVWoWINhgUQ0/gg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xQO7q-00000000c4r-3PX2; Mon, 09 Nov 2026 12:05:26 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.100.1 #2 (Red Hat Linux)) id 1xQO7p-00000000c3u-0GKh for linux-arm-kernel@lists.infradead.org; Mon, 09 Nov 2026 12:05:25 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 8168A63193; Mon, 9 Nov 2026 12:05:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9429B1F0089F; Mon, 9 Nov 2026 12:05:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794225924; bh=RuOhAvZnPjP1XPHFbitmFrHHdHIPhu/o1Rlh2k3boNo=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=EIiHA/jnHvo+Q4fpvT8AJOyb2hpOJY7Xo9vMny81pnTTP4xxoyuWC2gRSKz4nw+f7 vZuiWM6/9cL7w6O9dQjHrrvVLyWmsheXkoPwm9iiXuOETC0zQurR5JjE2S4z8ASP7e rjU5+0PyNPxmONuxlmN+MbIrdWuSerwdAud1UIbuzvyn8mb50OOM8MPqN5eFkS+yrH BPd+uz+qRkC3tHmfgoyj3amIn3bnNLznREzxXgOyE8HLPQwMrXaT7Cc8kEpaLoTAY4 z52qrphTGlnFIfOo54i5BRzjhKJFuLwz3foLVPpES4nlVrKmWlx/Naki/dR4qzP/ys c5V6fWR8imoJw== From: Jisheng Zhang To: Catalin Marinas , Will Deacon , Mark Rutland , Andrey Ryabinin , Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , Vincenzo Frascino , Tejun Heo , Dennis Zhou , Christoph Lameter Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-mm@kvack.org Subject: [PATCH v2 3/6] kasan: Always inline kasan_hw_tags_enabled() Date: Mon, 9 Nov 2026 19:44:56 +0800 Message-ID: <20261109114500.20298-4-jszhang@kernel.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20261109114500.20298-1-jszhang@kernel.org> References: <20261109114500.20298-1-jszhang@kernel.org> X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" X-Spam-Status: No, score=-18.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 The arm64 MTE entry and exit helpers call kasan_hw_tags_enabled() from noinstr code. Although kasan_enabled() is __always_inline, its wrapper kasan_hw_tags_enabled() uses plain inline. With CONFIG_KASAN_HW_TAGS=y and CONFIG_CC_OPTIMIZE_FOR_SIZE=y, GCC emits kasan_hw_tags_enabled() in .text and calls it from .noinstr.text. Mark both definitions __always_inline so the runtime check inherits its callers' instrumentation restrictions. Verified that the out-of-line symbol and calls disappear from the arm64 entry-common.o object after rebuilding. Signed-off-by: Jisheng Zhang Assisted-by: LLM --- include/linux/kasan-enabled.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/include/linux/kasan-enabled.h b/include/linux/kasan-enabled.h index 9eca967d8526..14a9e9fd6c6b 100644 --- a/include/linux/kasan-enabled.h +++ b/include/linux/kasan-enabled.h @@ -35,12 +35,12 @@ static inline void kasan_enable(void) {} #endif /* CONFIG_ARCH_DEFER_KASAN || CONFIG_KASAN_HW_TAGS */ #ifdef CONFIG_KASAN_HW_TAGS -static inline bool kasan_hw_tags_enabled(void) +static __always_inline bool kasan_hw_tags_enabled(void) { return kasan_enabled(); } #else -static inline bool kasan_hw_tags_enabled(void) +static __always_inline bool kasan_hw_tags_enabled(void) { return false; } -- 2.55.0