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rcu@vger.kernel.org, linux-nfs@vger.kernel.org, linux-rt-devel@lists.linux.dev, 2407018371@qq.com, dakr@kernel.org, miguel.ojeda.sandonis@gmail.com, neilb@ownmail.net, bagasdotme@gmail.com, wsa+renesas@sang-engineering.com, dave.hansen@intel.com, geert@linux-m68k.org, ojeda@kernel.org, alex.gaynor@gmail.com, gary@garyguo.net, bjorn3_gh@protonmail.com, lossin@kernel.org, a.hindborg@kernel.org, aliceryhl@google.com, tmgross@umich.edu, rust-for-linux@vger.kernel.org Subject: [PATCH v18 42/42] mm: percpu: increase PERCPU_DYNAMIC_SIZE_SHIFT on DEPT and large PAGE_SIZE Date: Fri, 5 Dec 2025 16:18:55 +0900 Message-Id: <20251205071855.72743-43-byungchul@sk.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20251205071855.72743-1-byungchul@sk.com> References: <20251205071855.72743-1-byungchul@sk.com> X-Brightmail-Tracker: H4sIAAAAAAAAAzWSbUxTdxTG/d/7v/97Wym5qSZcXxKXJpsJURSj5sRsuGRbcvdhyZJ9cHEf ZpUb21iKaZHKlmW1QqiICpi2kSIWHE1Dy1sr42XWVWCMhhGLKO2QqrwEcUJIHIUAug5q/HLy 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EYD73W0mUowKoGCdeC71JMnhQsqKz4YIZac2E1NeiGKbT+xlxn0NHZ2OGRE2jlH1pyq1fFKxqvowNon1IgmqwE+GgLkgVz5UAC33hbnFXOCnfuU2F7qnLOJk0+Htvjet+7TTS4lrydfmRpb0PvEni8eWQ/g== 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: Yunseong reported a build failure due to the BUILD_BUG_ON() statement in alloc_kmem_cache_cpus(). In the following test: PERCPU_DYNAMIC_EARLY_SIZE < NR_KMALLOC_TYPES * KMALLOC_SHIFT_HIGH * sizeof(struct kmem_cache_cpu) The following factors increase the right side of the equation: 1. PAGE_SIZE > 4KiB increases KMALLOC_SHIFT_HIGH. 2. DEPT increases the size of the local_lock_t in kmem_cache_cpu. Increase PERCPU_DYNAMIC_SIZE_SHIFT to 11 on configs with PAGE_SIZE larger than 4KiB and DEPT enabled. Reported-by: Yunseong Kim Signed-off-by: Byungchul Park --- include/linux/percpu.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/linux/percpu.h b/include/linux/percpu.h index 85bf8dd9f087..dd74321d4bbd 100644 --- a/include/linux/percpu.h +++ b/include/linux/percpu.h @@ -43,7 +43,11 @@ # define PERCPU_DYNAMIC_SIZE_SHIFT 12 #endif /* LOCKDEP and PAGE_SIZE > 4KiB */ #else +#if defined(CONFIG_DEPT) && !defined(CONFIG_PAGE_SIZE_4KB) +#define PERCPU_DYNAMIC_SIZE_SHIFT 11 +#else #define PERCPU_DYNAMIC_SIZE_SHIFT 10 +#endif /* DEPT and PAGE_SIZE > 4KiB */ #endif /* -- 2.17.1