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Fri, 11 Sep 2026 15:14:49 -0700 (PDT) From: Yury Norov X-Google-Original-From: Yury Norov To: Andrew Morton , Matthew Wilcox , "Liam R. Howlett" Cc: Yury Norov , Chris Li , Alice Ryhl , Andrew Ballance , Yury Norov , linux-sparse@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, maple-tree@lists.infradead.org Subject: [PATCH 1/3] compiler.h: add ASSERT_STATIC_STORAGE() Date: Fri, 11 Sep 2026 18:14:41 -0400 Message-ID: <20260911221444.1523311-2-ynorov@nvidia.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260911221444.1523311-1-ynorov@nvidia.com> References: <20260911221444.1523311-1-ynorov@nvidia.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 1B398A000A X-Stat-Signature: 6j6zs1sc7ri6g5gfxj7qfy36cay3enqn X-Rspamd-Server: rspam01 X-HE-Tag: 1789165289-827103 X-HE-Meta: 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 1T09xpWl 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Static lock initializers rely on a persistent object address when lockdep assigns a lock-class key. Using such an initializer for an automatic local object can compile successfully but disable lockdep on the first lock acquisition. Add ASSERT_STATIC_STORAGE() for declaration macros that require static storage duration. It declares an unused static pointer initialized with the object's address. An automatic local object's address is not a valid static initializer, so the compiler rejects it. Mirror the helper in tools/include/linux/compiler.h because the userspace radix-tree tests include the kernel IDA and Maple Tree headers with the tools compiler definitions. For example: void example(void) { int object; ASSERT_STATIC_STORAGE(object); } GCC reports: error: initializer element is not constant name##_storage_check = &(name) ^ note: in expansion of macro 'ASSERT_STATIC_STORAGE' ASSERT_STATIC_STORAGE(object); File-scope objects and static local objects remain valid. The helper takes an object identifier and must be used as a declaration after that object has been declared. Link: https://lore.kernel.org/all/20260911155244.1406122-1-ynorov@nvidia.com/ Signed-off-by: Yury Norov --- include/linux/compiler.h | 5 +++++ tools/include/linux/compiler.h | 5 +++++ 2 files changed, 10 insertions(+) diff --git a/include/linux/compiler.h b/include/linux/compiler.h index cb2f6050bdf7..ef9036fa5413 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -275,6 +275,11 @@ static inline void *offset_to_ptr(const int *off) #define __ADDRESSABLE(sym) \ ___ADDRESSABLE(sym, __section(".discard.addressable")) +/* Enforce static storage duration. */ +#define ASSERT_STATIC_STORAGE(name) \ + static typeof(name) * const __always_unused \ + name##_storage_check = &(name) + /* * This returns a constant expression while determining if an argument is * a constant expression, most importantly without evaluating the argument. diff --git a/tools/include/linux/compiler.h b/tools/include/linux/compiler.h index f2f54b038168..03ecf9086643 100644 --- a/tools/include/linux/compiler.h +++ b/tools/include/linux/compiler.h @@ -73,6 +73,11 @@ # define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b)) #endif +/* Enforce static storage duration. */ +#define ASSERT_STATIC_STORAGE(name) \ + static typeof(name) * const __always_unused \ + name##_storage_check = &(name) + /* * This returns a constant expression while determining if an argument is * a constant expression, most importantly without evaluating the argument. -- 2.53.0