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linux-modules@vger.kernel.org, rcu@vger.kernel.org, linux-nfs@vger.kernel.org, linux-rt-devel@lists.linux.dev Subject: [PATCH v17 47/47] mm: percpu: increase PERCPU_DYNAMIC_SIZE_SHIFT on DEPT and large PAGE_SIZE Date: Thu, 2 Oct 2025 17:12:47 +0900 Message-Id: <20251002081247.51255-48-byungchul@sk.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20251002081247.51255-1-byungchul@sk.com> References: <20251002081247.51255-1-byungchul@sk.com> X-Brightmail-Tracker: H4sIAAAAAAAAAzWSa0xTdxjG9z/3NlZOOpIeQLOtiTc2wQvON1EXvxjOFzKSZSZqiFQ5eppx MS1XjQkC9TYxWAIk4FhrsVJaFMELKjUVtQSRUMBgRS4WAWWlNCPQDKV2rdFvv/yeJ2+eDy+D y4fIWEadnStoslWZSkpKSH0rjBtjk8bETeecK2HolIOAyzdsFLiuWxHo7oUICOqdNCwsvaYh ZHciqO7X4+B9PI/Ab76AYOZpMvjGH5DwMjCLwDz5CYNJxxkEf19po+Bjbx8ORs8oDu9bwu6W cwyBvbGEgsHJlfBi0U9Bd9WfFPj6L2Mw10LBX3V6BKWmGxT0e5cxGKnWY2BtTYGaGQqqbyqg qvkBBkvmJhqem0YIqOsdJGHZsxlChhxwWt/RcN3XR0L32BAJ3mk9BeNdp0m4W/wmvP+FBwPb hWkcWt+GU/vwj2A83UDA2eACAmf7BAZjthAJLkcPCQNWFwHdtRYC+u43k9DW+xyHwMU4cF0q 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1759392864-527739 X-HE-Meta: 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 YVLPMmxy p+dukUxPHYBDnUcRcYTzZoHQaJWkmMJqRhSrWFBJ0JSu8lQcZTHJgaBajGwpJeEt2f3wkD14TqQC0Y9IdVoaXw1iuVX9ZsuvTJgtV9swsbmmyemmg9L7jw8nDmRJE3hMPUu9sYCmZBW2IMmaCaxhgcWThaQ== 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