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gustavo@padovan.org, christian.koenig@amd.com, andi.shyti@kernel.org, arnd@arndb.de, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, rppt@kernel.org, surenb@google.com, mcgrof@kernel.org, petr.pavlu@suse.com, da.gomez@kernel.org, samitolvanen@google.com, paulmck@kernel.org, frederic@kernel.org, neeraj.upadhyay@kernel.org, joelagnelf@nvidia.com, josh@joshtriplett.org, urezki@gmail.com, mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com, qiang.zhang@linux.dev, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, chuck.lever@oracle.com, neil@brown.name, okorniev@redhat.com, Dai.Ngo@oracle.com, tom@talpey.com, trondmy@kernel.org, anna@kernel.org, kees@kernel.org, bigeasy@linutronix.de, clrkwllms@kernel.org, mark.rutland@arm.com, ada.coupriediaz@arm.com, kristina.martsenko@arm.com, wangkefeng.wang@huawei.com, broonie@kernel.org, kevin.brodsky@arm.com, dwmw@amazon.co.uk, shakeel.butt@linux.dev, ast@kernel.org, ziy@nvidia.com, yuzhao@google.com, baolin.wang@linux.alibaba.com, usamaarif642@gmail.com, joel.granados@kernel.org, richard.weiyang@gmail.com, geert+renesas@glider.be, tim.c.chen@linux.intel.com, linux@treblig.org, alexander.shishkin@linux.intel.com, lillian@star-ark.net, chenhuacai@kernel.org, francesco@valla.it, guoweikang.kernel@gmail.com, link@vivo.com, jpoimboe@kernel.org, masahiroy@kernel.org, brauner@kernel.org, thomas.weissschuh@linutronix.de, oleg@redhat.com, mjguzik@gmail.com, andrii@kernel.org, wangfushuai@baidu.com, linux-doc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org, linux-i2c@vger.kernel.org, linux-arch@vger.kernel.org, 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: H4sIAAAAAAAAAzWSbUhTYRTHfe597t3dcHRdoVeLiqUEUpmhcqyQ6IPc6ksRUVZQIy9t+Npm vhTCTKUlmUMwccul5XuTdCapaJjmu9BCWitcZaROIcWXpalpW+WXw4//+fHnfDgMKcunAhhV YoqgTlTEy2kJlvzwLt8fEPZZedDZR4NrUYdBZymh4ItLh2Bp1UiC+UUWAQsN6zQUjX2noXgq C4NhwiiCDcckAb8fxkFxkRXBuL6ZhLI7HRQ8LLVgaP3aJoIvVRMYhvRPCDAWZ3uGk4AqbRB8 qzGIwFFQhMHysQeBrs2FocQ0SkN7xwCGkbZHNNxvaKZAa1yi4PmknYCh3n4MlR/eETD21U5B /cwTGnrLfGG+4ieGvvxOAioXZ0iYNJQSMOhYEMFKtbt4cGWQgPnSdQoa5qppWF12F9f/tiGY 0S9Sxw7yS7kPMG82mRG/WJlN8jlNafyK6z3NtxocIr7McpNvqgnmn7ZPEXz5vIviLXX3aH7U 1k7z5doikjcNnOHnxj9hvrWwgzjtd1FyNFaIV6UK6pCoqxKl/Y2dSm4Wp7/UbYi06JsoD4kZ jg3jHLW/qE1erh2nPUyzezm7/Rfp4W3sbq4pf+KvQ7JDOzjbu30e3soKXNt0i9thGMwGcabs GE8sZSO42Z5a8l/lLu5ZQ+dfFrvzkbEh7GEZG87lzuYQeUjidp6KuZmxuf/3+HOva+xYj6Rl 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4XyxI5+/4Zmh+A/zzyne9d5K8I9rOf5S/xbeWe2n+eI/X9BHdh0T7zklqFV5gmbr3jSxcvjB MJnTJtL9URKmC9E4/SsSMRy7k/u3YYKKMsVu5IaHF/Eox7DrOEdZkIwyznq+5ga930b5C1bg 7r7piGQYhmATuBrD0agsYb/jQj0N+OeTa7kme+cnFkV035iHiLKUTeaMoWKsHImtaFUjilFl 5WUqVOrkRG2GsiBLpUs8mZ3ZgiLPZDu3fKkDzflSuhDLIPlqiTfBr5SSijxtQWYX4hhcHiNJ qx9RSiWnFAU/CZrsE5pctaDtQl8xhFwmOfSjkCZl0xVnhQxByBE0/7sYI4orRPe/CQbzN+oa 7HT7YYv4oUO3Y2j/NVtsaezlX2JdPQe7c55bRb1Jsvjk0qKB9b7l3X2bJzpO63MT/e369B9k lqGA2r6neMOChq5xn1fVulKdcoXgkf68nZAdonSbvj9Z2l125u/BxLbc1Ibt8Qf0+HR6X1Vw ZrTV/Ch/U//+3uNyQqtUJG3GNVrFfyOFB8lIAwAA X-CFilter-Loop: Reflected Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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 * sizeo= f(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 =20 /* --=20 2.17.1