From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794225924; b=ldYawCeC5+sQHXmO+NUx3Nhef4ej2fslKlnJhp6evYYQ1hkwabwybnn4nTbIQSZwlfia Q1z3ZH7EtQKRsmoQy69ycmrng1qnK6ezuz4vrJj8TBJR9QRgtNrs2p9aE+y8wFuE5eqHL vQeDIO8vwEeeFIfoJ99LE/EpM+06HOdr+dD6Bf19Q9Q/auEU0XcKazbZTTXH98A/PT7ip XFongrIKY4biFJIH4jOPWkUfRo7N3yijVkSJuXUFQhmg3S8/E4fHX1SuQzRlpR8693O8x KrkOiOwuKKuGYW8qUG/qqpa4Yk3DkZ9B8rlczRaLJ68d0wqwolH4n0qCXsrdV6welKA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794225924; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:Content-Transfer-Encoding; bh=RuOhAvZnPjP1XPHFbitmFrHHdHIPhu/o1Rlh2k3boNo=; b=rcPIFHCTg4HvnoVZwF/GdYg9zKtObbY3VKigzImnoVuJGziTlVLffKLRJPsO4Rg6jQUQ Qh5vT3jAhFtV0MIx5a/4u9B5jU8XtaNpnja3HI9F1Q2PIvexpS/FhMxCkjAagonytYZhD 0oJl9Yx7b26f6V22TNCYOVbPgL83b2828gbzPH/T7Gw6kVnx2hM7n/nr/bUE2S6B+vG5S dbAAez/izXsoU963A39C6mKiYGktpFUrky6KLs486k8jYdotiTTnoGu77fLfJUsfmdKig jKAHIxID+mPJng5olLIaLzrbsZp17vhPBgiBvFn4OUWPypFkViRMLgWBwi8bX8NbHbw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b="EIiHA/jn"; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5D4C0606A32A for ; Mon, 9 Nov 2026 12:05:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=EIiHA/jn 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-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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