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Sat, 14 Nov 2026 08:56:28 -0800 (PST) Received: from SafoStation ([31.40.65.49]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5c1712dad26sm1792051e87.8.2026.11.14.08.56.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 14 Nov 2026 08:56:28 -0800 (PST) From: Safocl Stollmannovic To: Russell King Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v3 01/14] ARM: fix duplicate extern declarations Date: Sat, 14 Nov 2026 20:55:41 +0400 Message-ID: <20261114165612.368785-2-safocl88@gmail.com> X-Mailer: git-send-email 2.56.1 In-Reply-To: <20261114165612.368785-1-safocl88@gmail.com> References: <20261114165612.368785-1-safocl88@gmail.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Compiling a kernel module with a C++ compiler results in a "duplicate extern specifier" error. This occurs because the code contains `extern asmlinkage`, and `asmlinkage` expands to `extern C` when processed by a C++ compiler. Since the code already contains sections that respond to a C++ compiler, I believe it is a perfectly valid approach to gradually move toward a state where kernel modules can be compiled by a C++ compiler without any issues. The `extern` specifier must be removed. Link: https://bugzilla.kernel.org/show_bug.cgi?id=222257 Signed-off-by: Safocl Stollmannovic --- arch/arm/include/asm/bug.h | 2 +- arch/arm/include/asm/opcodes.h | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm/include/asm/bug.h b/arch/arm/include/asm/bug.h index ba8d9d7d2..985857d65 100644 --- a/arch/arm/include/asm/bug.h +++ b/arch/arm/include/asm/bug.h @@ -82,7 +82,7 @@ void hook_ifault_code(int nr, int (*fn)(unsigned long, unsigned int, struct pt_regs *), int sig, int code, const char *name); -extern asmlinkage void c_backtrace(unsigned long fp, int pmode, +asmlinkage void c_backtrace(unsigned long fp, int pmode, const char *loglvl); struct mm_struct; diff --git a/arch/arm/include/asm/opcodes.h b/arch/arm/include/asm/opcodes.h index 38e3eabff..afa29833f 100644 --- a/arch/arm/include/asm/opcodes.h +++ b/arch/arm/include/asm/opcodes.h @@ -8,7 +8,7 @@ #ifndef __ASSEMBLY__ #include -extern asmlinkage unsigned int arm_check_condition(u32 opcode, u32 psr); +asmlinkage unsigned int arm_check_condition(u32 opcode, u32 psr); #endif #define ARM_OPCODE_CONDTEST_FAIL 0 -- 2.56.1