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Wed, 19 Mar 2025 18:56:09 -0700 (PDT) Date: Wed, 19 Mar 2025 18:55:41 -0700 In-Reply-To: <20250320015551.2157511-1-changyuanl@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250320015551.2157511-1-changyuanl@google.com> X-Mailer: git-send-email 2.49.0.rc1.451.g8f38331e32-goog Message-ID: <20250320015551.2157511-7-changyuanl@google.com> Subject: [PATCH v5 06/16] hashtable: add macro HASHTABLE_INIT From: Changyuan Lyu To: linux-kernel@vger.kernel.org Cc: graf@amazon.com, akpm@linux-foundation.org, luto@kernel.org, anthony.yznaga@oracle.com, arnd@arndb.de, ashish.kalra@amd.com, benh@kernel.crashing.org, bp@alien8.de, catalin.marinas@arm.com, dave.hansen@linux.intel.com, dwmw2@infradead.org, ebiederm@xmission.com, mingo@redhat.com, jgowans@amazon.com, corbet@lwn.net, krzk@kernel.org, rppt@kernel.org, mark.rutland@arm.com, pbonzini@redhat.com, pasha.tatashin@soleen.com, hpa@zytor.com, peterz@infradead.org, ptyadav@amazon.de, robh+dt@kernel.org, robh@kernel.org, saravanak@google.com, skinsburskii@linux.microsoft.com, rostedt@goodmis.org, tglx@linutronix.de, thomas.lendacky@amd.com, usama.arif@bytedance.com, will@kernel.org, devicetree@vger.kernel.org, kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, Changyuan Lyu Content-Type: text/plain; charset="UTF-8" Similar to HLIST_HEAD_INIT, HASHTABLE_INIT allows a hashtable embedded in another structure to be initialized at compile time. Example, struct tree_node { DECLARE_HASHTABLE(properties, 4); DECLARE_HASHTABLE(sub_nodes, 4); }; static struct tree_node root_node = { .properties = HASHTABLE_INIT(4), .sub_nodes = HASHTABLE_INIT(4), }; Signed-off-by: Changyuan Lyu --- include/linux/hashtable.h | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/include/linux/hashtable.h b/include/linux/hashtable.h index f6c666730b8c..27e07a436e2a 100644 --- a/include/linux/hashtable.h +++ b/include/linux/hashtable.h @@ -13,13 +13,14 @@ #include #include +#define HASHTABLE_INIT(bits) { [0 ... ((1 << (bits)) - 1)] = HLIST_HEAD_INIT } + #define DEFINE_HASHTABLE(name, bits) \ - struct hlist_head name[1 << (bits)] = \ - { [0 ... ((1 << (bits)) - 1)] = HLIST_HEAD_INIT } + struct hlist_head name[1 << (bits)] = HASHTABLE_INIT(bits) \ #define DEFINE_READ_MOSTLY_HASHTABLE(name, bits) \ struct hlist_head name[1 << (bits)] __read_mostly = \ - { [0 ... ((1 << (bits)) - 1)] = HLIST_HEAD_INIT } + HASHTABLE_INIT(bits) #define DECLARE_HASHTABLE(name, bits) \ struct hlist_head name[1 << (bits)] -- 2.48.1.711.g2feabab25a-goog