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[198.145.29.99]) by mx.google.com with ESMTPS id az7si17746506pjb.51.2019.07.26.06.40.58 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 26 Jul 2019 06:40:58 -0700 (PDT) Received-SPF: pass (google.com: domain of sashal@kernel.org designates 198.145.29.99 as permitted sender) client-ip=198.145.29.99; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=ELrxyKFQ; spf=pass (google.com: domain of sashal@kernel.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=sashal@kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (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 9EA4E22CB8; Fri, 26 Jul 2019 13:40:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564148458; bh=+djP42l890PRgPpyfSuCFeOV38wuWwlVMb3pz0E+Mag=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ELrxyKFQDLqS1N5c45EI7brqIhCoo9ezXaunRAkZNDL3vpyy6+ZfRXRWB1FAluPLh Qdjvq9/47PBveEgpJTgU/EAi6ElyHoYEJE8J/Ejb1B0gqRLDBR+qKeD1PMwz08kP7U 3c31vM3g2rLrw6seYjiqD294n+lVi3mTgSjoQtxY= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Arnd Bergmann , David Rientjes , Andrew Morton , Christoph Lameter , Pekka Enberg , Joonsoo Kim , Stephen Rothwell , Roman Gushchin , Shakeel Butt , Vladimir Davydov , Andrey Konovalov , Linus Torvalds , Sasha Levin , linux-mm@kvack.org, clang-built-linux@googlegroups.com Subject: [PATCH AUTOSEL 5.2 51/85] mm/slab_common.c: work around clang bug #42570 Date: Fri, 26 Jul 2019 09:39:01 -0400 Message-Id: <20190726133936.11177-51-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190726133936.11177-1-sashal@kernel.org> References: <20190726133936.11177-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Arnd Bergmann [ Upstream commit a07057dce2823e10d64a2b73cefbf09d8645efe9 ] Clang gets rather confused about two variables in the same special section when one of them is not initialized, leading to an assembler warning later: /tmp/slab_common-18f869.s: Assembler messages: /tmp/slab_common-18f869.s:7526: Warning: ignoring changed section attributes for .data..ro_after_init Adding an initialization to kmalloc_caches is rather silly here but does avoid the issue. Link: https://bugs.llvm.org/show_bug.cgi?id=42570 Link: http://lkml.kernel.org/r/20190712090455.266021-1-arnd@arndb.de Signed-off-by: Arnd Bergmann Acked-by: David Rientjes Reviewed-by: Andrew Morton Cc: Christoph Lameter Cc: Pekka Enberg Cc: Joonsoo Kim Cc: Stephen Rothwell Cc: Roman Gushchin Cc: Shakeel Butt Cc: Vladimir Davydov Cc: Andrey Konovalov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- mm/slab_common.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/slab_common.c b/mm/slab_common.c index 58251ba63e4a..cbd3411f644e 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -1003,7 +1003,8 @@ struct kmem_cache *__init create_kmalloc_cache(const char *name, } struct kmem_cache * -kmalloc_caches[NR_KMALLOC_TYPES][KMALLOC_SHIFT_HIGH + 1] __ro_after_init; +kmalloc_caches[NR_KMALLOC_TYPES][KMALLOC_SHIFT_HIGH + 1] __ro_after_init = +{ /* initialization for https://bugs.llvm.org/show_bug.cgi?id=42570 */ }; EXPORT_SYMBOL(kmalloc_caches); /* -- 2.20.1