From nobody Fri Dec 19 17:02:20 2025 Received: from out-189.mta1.migadu.com (out-189.mta1.migadu.com [95.215.58.189]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BDEF973197 for ; Thu, 21 Dec 2023 20:05:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="oUd4oho2" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1703189099; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=25+JPAVVR93qloIeZBPh87TvRbXcdeZ++9g3nzTCJ2g=; b=oUd4oho2PQFVBsMx441Y1BJ9xZLJRj3/NEa+HI+PvsMu+h8/Evf4eJR6JIIS7+fS93FGb7 Ih/Fyn0cbQWAZzwK+nS3P7ZRUaf95dp2MAee2vmD/jR6DwOerV5e/55LchsDaXoVGmFMIn 0QPWF12bI5PU1x2N2e+NkASW14dnAIM= From: andrey.konovalov@linux.dev To: Marco Elver Cc: Andrey Konovalov , Alexander Potapenko , Dmitry Vyukov , Andrey Ryabinin , kasan-dev@googlegroups.com, Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrey Konovalov Subject: [PATCH mm 02/11] mm, kasan: use KASAN_TAG_KERNEL instead of 0xff Date: Thu, 21 Dec 2023 21:04:44 +0100 Message-Id: <71db9087b0aebb6c4dccbc609cc0cd50621533c7.1703188911.git.andreyknvl@google.com> In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Migadu-Flow: FLOW_OUT Content-Type: text/plain; charset="utf-8" From: Andrey Konovalov Use the KASAN_TAG_KERNEL marco instead of open-coding 0xff in the mm code. This macro is provided by include/linux/kasan-tags.h, which does not include any other headers, so it's safe to include it into mm.h without causing circular include dependencies. Signed-off-by: Andrey Konovalov --- include/linux/kasan.h | 1 + include/linux/mm.h | 4 ++-- mm/page_alloc.c | 2 +- 3 files changed, 4 insertions(+), 3 deletions(-) diff --git a/include/linux/kasan.h b/include/linux/kasan.h index d49e3d4c099e..dbb06d789e74 100644 --- a/include/linux/kasan.h +++ b/include/linux/kasan.h @@ -4,6 +4,7 @@ =20 #include #include +#include #include #include #include diff --git a/include/linux/mm.h b/include/linux/mm.h index a422cc123a2d..8b2e4841e817 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1815,7 +1815,7 @@ static inline void vma_set_access_pid_bit(struct vm_a= rea_struct *vma) =20 static inline u8 page_kasan_tag(const struct page *page) { - u8 tag =3D 0xff; + u8 tag =3D KASAN_TAG_KERNEL; =20 if (kasan_enabled()) { tag =3D (page->flags >> KASAN_TAG_PGSHIFT) & KASAN_TAG_MASK; @@ -1844,7 +1844,7 @@ static inline void page_kasan_tag_set(struct page *pa= ge, u8 tag) static inline void page_kasan_tag_reset(struct page *page) { if (kasan_enabled()) - page_kasan_tag_set(page, 0xff); + page_kasan_tag_set(page, KASAN_TAG_KERNEL); } =20 #else /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */ diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 7ea9c33320bf..51e85760877a 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1059,7 +1059,7 @@ static inline bool should_skip_kasan_poison(struct pa= ge *page, fpi_t fpi_flags) if (IS_ENABLED(CONFIG_KASAN_GENERIC)) return deferred_pages_enabled(); =20 - return page_kasan_tag(page) =3D=3D 0xff; + return page_kasan_tag(page) =3D=3D KASAN_TAG_KERNEL; } =20 static void kernel_init_pages(struct page *page, int numpages) --=20 2.25.1