From: Arnd Bergmann <arnd@kernel.org> To: Russell King <linux@armlinux.org.uk> Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>, Ard Biesheuvel <ardb@kernel.org>, Linus Walleij <linus.walleij@linaro.org>, Nathan Chancellor <nathan@kernel.org>, Nick Desaulniers <ndesaulniers@google.com>, llvm@lists.linux.dev Subject: [PATCH 02/14] ARM: patch: fix BE32 compilation Date: Tue, 28 Sep 2021 17:41:31 +0200 [thread overview] Message-ID: <20210928154143.2106903-3-arnd@kernel.org> (raw) In-Reply-To: <20210928154143.2106903-1-arnd@kernel.org> From: Arnd Bergmann <arnd@arndb.de> On BE32 kernels, the __opcode_to_mem_thumb32() interface is intentionally not defined, but it is referenced whenever runtime patching is enabled for the kernel, which may be for ftrace, jump label, kprobes or kgdb: arch/arm/kernel/patch.c: In function '__patch_text_real': arch/arm/kernel/patch.c:94:32: error: implicit declaration of function '__opcode_to_mem_thumb32' [-Werror=implicit-function-declaration] 94 | insn = __opcode_to_mem_thumb32(insn); | ^~~~~~~~~~~~~~~~~~~~~~~ Since BE32 kernels never run Thumb2 code, we never end up using the result of this call, so providing an extern declaration without a definition makes it build correctly. Signed-off-by: Arnd Bergmann <arnd@arndb.de> --- arch/arm/include/asm/opcodes.h | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/arch/arm/include/asm/opcodes.h b/arch/arm/include/asm/opcodes.h index 6bff94b2372b..38e3eabff5c3 100644 --- a/arch/arm/include/asm/opcodes.h +++ b/arch/arm/include/asm/opcodes.h @@ -110,12 +110,17 @@ extern asmlinkage unsigned int arm_check_condition(u32 opcode, u32 psr); #define __opcode_to_mem_thumb16(x) ___opcode_identity16(x) #define ___asm_opcode_to_mem_arm(x) ___asm_opcode_identity32(x) #define ___asm_opcode_to_mem_thumb16(x) ___asm_opcode_identity16(x) -#ifndef CONFIG_CPU_ENDIAN_BE32 +#ifdef CONFIG_CPU_ENDIAN_BE32 +#ifndef __ASSEMBLY__ /* * On BE32 systems, using 32-bit accesses to store Thumb instructions will not * work in all cases, due to alignment constraints. For now, a correct - * version is not provided for BE32. + * version is not provided for BE32, but the prototype needs to be there + * to compile patch.c. */ +extern __u32 __opcode_to_mem_thumb32(__u32); +#endif +#else #define __opcode_to_mem_thumb32(x) ___opcode_swahw32(x) #define ___asm_opcode_to_mem_thumb32(x) ___asm_opcode_swahw32(x) #endif -- 2.29.2
WARNING: multiple messages have this Message-ID (diff)
From: Arnd Bergmann <arnd@kernel.org> To: Russell King <linux@armlinux.org.uk> Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>, Ard Biesheuvel <ardb@kernel.org>, Linus Walleij <linus.walleij@linaro.org>, Nathan Chancellor <nathan@kernel.org>, Nick Desaulniers <ndesaulniers@google.com>, llvm@lists.linux.dev Subject: [PATCH 02/14] ARM: patch: fix BE32 compilation Date: Tue, 28 Sep 2021 17:41:31 +0200 [thread overview] Message-ID: <20210928154143.2106903-3-arnd@kernel.org> (raw) In-Reply-To: <20210928154143.2106903-1-arnd@kernel.org> From: Arnd Bergmann <arnd@arndb.de> On BE32 kernels, the __opcode_to_mem_thumb32() interface is intentionally not defined, but it is referenced whenever runtime patching is enabled for the kernel, which may be for ftrace, jump label, kprobes or kgdb: arch/arm/kernel/patch.c: In function '__patch_text_real': arch/arm/kernel/patch.c:94:32: error: implicit declaration of function '__opcode_to_mem_thumb32' [-Werror=implicit-function-declaration] 94 | insn = __opcode_to_mem_thumb32(insn); | ^~~~~~~~~~~~~~~~~~~~~~~ Since BE32 kernels never run Thumb2 code, we never end up using the result of this call, so providing an extern declaration without a definition makes it build correctly. Signed-off-by: Arnd Bergmann <arnd@arndb.de> --- arch/arm/include/asm/opcodes.h | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/arch/arm/include/asm/opcodes.h b/arch/arm/include/asm/opcodes.h index 6bff94b2372b..38e3eabff5c3 100644 --- a/arch/arm/include/asm/opcodes.h +++ b/arch/arm/include/asm/opcodes.h @@ -110,12 +110,17 @@ extern asmlinkage unsigned int arm_check_condition(u32 opcode, u32 psr); #define __opcode_to_mem_thumb16(x) ___opcode_identity16(x) #define ___asm_opcode_to_mem_arm(x) ___asm_opcode_identity32(x) #define ___asm_opcode_to_mem_thumb16(x) ___asm_opcode_identity16(x) -#ifndef CONFIG_CPU_ENDIAN_BE32 +#ifdef CONFIG_CPU_ENDIAN_BE32 +#ifndef __ASSEMBLY__ /* * On BE32 systems, using 32-bit accesses to store Thumb instructions will not * work in all cases, due to alignment constraints. For now, a correct - * version is not provided for BE32. + * version is not provided for BE32, but the prototype needs to be there + * to compile patch.c. */ +extern __u32 __opcode_to_mem_thumb32(__u32); +#endif +#else #define __opcode_to_mem_thumb32(x) ___opcode_swahw32(x) #define ___asm_opcode_to_mem_thumb32(x) ___asm_opcode_swahw32(x) #endif -- 2.29.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-09-28 15:42 UTC|newest] Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-09-28 15:41 [PATCH 00/14] ARM: randconfig build fixes Arnd Bergmann 2021-09-28 15:41 ` Arnd Bergmann 2021-09-28 15:41 ` [PATCH 01/14] ARM: RiscPC needs older gcc version Arnd Bergmann 2021-09-28 15:41 ` Arnd Bergmann 2021-09-28 16:03 ` Arnd Bergmann 2021-09-28 16:03 ` Arnd Bergmann 2021-09-28 16:03 ` Arnd Bergmann 2021-09-29 8:45 ` Arnd Bergmann 2021-09-29 8:45 ` Arnd Bergmann 2021-09-29 8:45 ` Arnd Bergmann 2021-09-28 15:41 ` Arnd Bergmann [this message] 2021-09-28 15:41 ` [PATCH 02/14] ARM: patch: fix BE32 compilation Arnd Bergmann 2021-09-28 21:33 ` Linus Walleij 2021-09-28 21:33 ` Linus Walleij 2021-09-28 21:33 ` Linus Walleij 2021-09-28 15:41 ` [PATCH 03/14] ARM: remove duplicate memcpy() definition Arnd Bergmann 2021-09-28 15:41 ` Arnd Bergmann 2021-09-28 21:39 ` Linus Walleij 2021-09-28 21:39 ` Linus Walleij 2021-09-28 21:39 ` Linus Walleij 2021-09-28 15:41 ` [PATCH 04/14] ARM: kprobes: address gcc -Wempty-body warning Arnd Bergmann 2021-09-28 15:41 ` Arnd Bergmann 2021-09-28 15:41 ` [PATCH 05/14] ARM: ARMv7-M uses BE-8, not BE-32 Arnd Bergmann 2021-09-28 15:41 ` Arnd Bergmann 2021-09-28 15:41 ` [PATCH 06/14] ARM: disallow CONFIG_THUMB with ARMv4 Arnd Bergmann 2021-09-28 15:41 ` Arnd Bergmann 2021-09-29 18:52 ` Nick Desaulniers 2021-09-29 18:52 ` Nick Desaulniers 2021-09-29 18:52 ` Nick Desaulniers 2021-10-06 16:01 ` Ard Biesheuvel 2021-10-06 16:01 ` Ard Biesheuvel 2021-09-28 15:41 ` [PATCH 07/14] ARM: fix link warning with XIP + frame-pointer Arnd Bergmann 2021-09-28 15:41 ` Arnd Bergmann 2021-09-28 15:41 ` [PATCH 08/14] ARM: kprobes: fix arch_init_kprobes() prototype Arnd Bergmann 2021-09-28 15:41 ` Arnd Bergmann 2021-09-28 15:41 ` [PATCH 09/14] ARM: allow compile-testing without machine record Arnd Bergmann 2021-09-28 15:41 ` Arnd Bergmann 2021-09-28 15:41 ` [PATCH 10/14] ARM: only warn about XIP address when not compile testing Arnd Bergmann 2021-09-28 15:41 ` Arnd Bergmann 2021-09-28 15:41 ` [PATCH 11/14] ARM: kasan: work around LPAE build warning Arnd Bergmann 2021-09-28 15:41 ` Arnd Bergmann 2021-09-28 15:41 ` [PATCH 12/14] ARM: add CONFIG_PHYS_OFFSET default values Arnd Bergmann 2021-09-28 15:41 ` Arnd Bergmann 2021-09-28 16:02 ` Nicolas Pitre 2021-09-28 16:02 ` Nicolas Pitre 2021-09-28 16:02 ` Nicolas Pitre 2021-09-28 21:44 ` Linus Walleij 2021-09-28 21:44 ` Linus Walleij 2021-09-28 21:44 ` Linus Walleij 2021-09-28 15:41 ` [PATCH 13/14] ARM: use .arch directives instead of assembler command line flags Arnd Bergmann 2021-09-28 15:41 ` Arnd Bergmann 2021-09-28 17:10 ` Nick Desaulniers 2021-09-28 17:10 ` Nick Desaulniers 2021-09-28 17:10 ` Nick Desaulniers 2021-09-28 18:32 ` Arnd Bergmann 2021-09-28 18:32 ` Arnd Bergmann 2021-09-28 18:32 ` Arnd Bergmann 2021-09-29 18:11 ` Nick Desaulniers 2021-09-29 18:11 ` Nick Desaulniers 2021-09-29 18:11 ` Nick Desaulniers 2022-01-21 22:17 ` Nathan Chancellor 2022-01-21 22:17 ` Nathan Chancellor 2021-09-28 15:41 ` [PATCH 14/14] [RFC] ARM: forbid ftrace with clang and thumb2_kernel Arnd Bergmann 2021-09-28 15:41 ` Arnd Bergmann 2021-09-28 17:20 ` Nick Desaulniers 2021-09-28 17:20 ` Nick Desaulniers 2021-09-28 17:20 ` Nick Desaulniers
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