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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 v19 38/40] mm: percpu: increase PERCPU_DYNAMIC_SIZE_SHIFT on DEPT and large PAGE_SIZE Date: Mon, 6 Jul 2026 15:19:26 +0900 Message-Id: <20260706061928.66713-39-byungchul@sk.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20260706061928.66713-1-byungchul@sk.com> References: <20260706061928.66713-1-byungchul@sk.com> X-Brightmail-Tracker: H4sIAAAAAAAAAzVSbUxTZxj1vfe9H21scq1mXnFT0oguGnAYMM8Po/4xuUg0MyQmajJt1uso lsLKt8uywgBrB1oxHRFEq4wLCqmshU2QToYGgsgs2QcdrGK1KyowUAtOW62txn/nOec5JzlP HpZU/k3FsVp9vmjQq3UqWo7lM4svJpanpWd9cvnsKjBVfAPzQRMGk+MMBW57K4KJeROC56F6 Eiq6Ihhe1fQzEHwxzoC1FEHE1Y/A475OwrP21zRM3XiKwOrz01D7qBTDrFQVXfFOEjC6MI1A 8r8mwN97DEFo+A4JtVY3ggs+LwmuljIa/rV0kjBo/Y4GW5mLgob6GgSBMRcB3zc4MHTd62Zg ZCpMQKtjF0xIAQxDlotR8cflUF/7kIDbjf9gkIwJEPYlQ8SWA/2tkwx4T1ox2GfuUDB49y8K 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rust-for-linux@vger.kernel.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