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Fri, 4 Oct 2024 09:57:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1728035829; bh=QmFYoC1IHM+OAIDny2KkOyA6l3NAUFs34jQGh53m32c=; h=From:To:Cc:Subject:Date:From; b=HAqVMtgsJZBGRupdDGNIvb4ax1Y65X5H1hZWJN8hd+0n5FGfbttmR+l9CtlqL67+V HSF2L6AHj+Ta5h7NdrbAUFRUw7jPuBhsqL4cKdogNxJaJP4uXa1tbgWfXeeIvAKq4Z ZUF995SGitiFacEpv7XrOdu8S5y72gIlK+r0HTUhaEBlaHj8bPxUf58sdN7oTp5B7r R4FfjUT56ka6DsibNk7oZTePB+dJoAp2ccQwBjn0yJBVr5zG++IEs+exiZpjHCcjMP zSvHRGL44IRDhdwttEiuETCGZe9gvk1Jb2RMo13AQ9SJZft8PXkzQWKtSRRxfjQCpO fj8/MV+6Kgr7g== From: Arnd Bergmann To: Dennis Zhou , Tejun Heo , Christoph Lameter , Sebastian Andrzej Siewior , Thomas Gleixner , Will Deacon Cc: Arnd Bergmann , kernel test robot , Andrew Morton , Suren Baghdasaryan , Kent Overstreet , Hou Tao , Jan Kara , Jianhui Zhou <912460177@qq.com>, Yury Norov , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH] preempt_rt: increase PERCPU_DYNAMIC_SIZE_SHIFT for slab randomization Date: Fri, 4 Oct 2024 09:56:56 +0000 Message-Id: <20241004095702.637528-1-arnd@kernel.org> X-Mailer: git-send-email 2.39.2 MIME-Version: 1.0 X-Rspam-User: X-Rspamd-Queue-Id: 2C763180009 X-Rspamd-Server: rspam01 X-Stat-Signature: 1m77g5oq6egyeqgndz3rq8b1jzmrbzu3 X-HE-Tag: 1728035830-65028 X-HE-Meta: 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 XIbJJz66 kIZMbFwIIUd1GXKDiXaaFVIwimCYk/RHJCb4Ab84Co25GZslQlDg56KrVlzSQJId6o22G+oaY7UYZDMNBKddpmJRi9SLC/tuJ81WAlNPEoUSXzT9IlmZC426cszTR63CwFxKe9swL524NFHm0XcOVdLcXlAT7Q6NbKepZJ7QXH67bTVh3A86T5PCtulMHpWHCrZMZoYmpXZhf5KaBx8ea46kI5gF4KJxoN1dW372j3x82sHWfB+10bkMAci0wmQUdYu4aMRG3oZ4jEbz2vSmdCf0kxWK0VMTmH3/sWECfIjSrGQg62s7slxgySjf/G2xcqr3wN25L3x2bfgbTt5tAUgFY3+vDoaOPeY4a+Hb3EohQkAf0ZRchMrxHKoQ4i/DOwwXjMrfjYvORNb2jhP4KZRE3xQ== 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: List-Subscribe: List-Unsubscribe: From: Arnd Bergmann When both PREEMPT_RT and RANDOM_KMALLOC_CACHES are enabled, the slub allocator runs into a build time failure: In file included from : In function 'alloc_kmem_cache_cpus', inlined from 'do_kmem_cache_create' at mm/slub.c:6041:7: include/linux/compiler_types.h:517:45: error: call to '__compiletime_assert_598' declared with attribute error: BUILD_BUG_ON failed: PERCPU_DYNAMIC_EARLY_SIZE < NR_KMALLOC_TYPES * KMALLOC_SHIFT_HIGH * sizeof(struct kmem_cache_cpu) 517 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | ^ include/linux/compiler_types.h:498:25: note: in definition of macro '__compiletime_assert' 498 | prefix ## suffix(); \ | ^~~~~~ include/linux/compiler_types.h:517:9: note: in expansion of macro '_compiletime_assert' 517 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | ^~~~~~~~~~~~~~~~~~~ include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert' 39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg) | ^~~~~~~~~~~~~~~~~~ include/linux/build_bug.h:50:9: note: in expansion of macro 'BUILD_BUG_ON_MSG' 50 | BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition) | ^~~~~~~~~~~~~~~~ mm/slub.c:5133:9: note: in expansion of macro 'BUILD_BUG_ON' 5133 | BUILD_BUG_ON(PERCPU_DYNAMIC_EARLY_SIZE < | ^~~~~~~~~~~~ The problem is the additional size overhead from local_lock in struct kmem_cache_cpu. Avoid this by preallocating a larger area. Fixes: d8fccd9ca5f9 ("arm64: Allow to enable PREEMPT_RT.") Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202410020326.iaZIteIx-lkp@intel.com/ Signed-off-by: Arnd Bergmann --- There is a good chance that there is a better way to address this, this version was the first I came up with and I verified that it fixes all of the broken configs. See https://pastebin.com/raw/tuPgfPzu for a .config from a failing randconfig build on 6.12-rc1. --- include/linux/percpu.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/linux/percpu.h b/include/linux/percpu.h index b6321fc49159..4083295da27f 100644 --- a/include/linux/percpu.h +++ b/include/linux/percpu.h @@ -41,7 +41,11 @@ PCPU_MIN_ALLOC_SHIFT) #ifdef CONFIG_RANDOM_KMALLOC_CACHES +#ifdef CONFIG_PREEMPT_RT +#define PERCPU_DYNAMIC_SIZE_SHIFT 13 +#else #define PERCPU_DYNAMIC_SIZE_SHIFT 12 +#endif #else #define PERCPU_DYNAMIC_SIZE_SHIFT 10 #endif