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 14/14] [RFC] ARM: forbid ftrace with clang and thumb2_kernel Date: Tue, 28 Sep 2021 17:41:43 +0200 [thread overview] Message-ID: <20210928154143.2106903-15-arnd@kernel.org> (raw) In-Reply-To: <20210928154143.2106903-1-arnd@kernel.org> From: Arnd Bergmann <arnd@arndb.de> clang fails to build kernels with THUMB2 and FUNCTION_TRACER enabled when there is any inline asm statement containing the frame pointer register r7: arch/arm/mach-versatile/dcscb.c:95:2: error: inline asm clobber list contains reserved registers: R7 [-Werror,-Winline-asm] arch/arm/mach-exynos/mcpm-exynos.c:154:2: error: inline asm clobber list contains reserved registers: R7 [-Werror,-Winline-asm] arch/arm/probes/kprobes/actions-thumb.c:449:3: error: inline asm clobber list contains reserved registers: R7 [-Werror,-Winline-asm] Apparently gcc should also have warned about this, and the configuration is actually invalid, though there is some disagreement on the bug trackers about this. Link: https://bugs.llvm.org/show_bug.cgi?id=45826 Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94986 Signed-off-by: Arnd Bergmann <arnd@arndb.de> --- arch/arm/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 0d4f3e2d50ad..7ea95bb40004 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -91,7 +91,7 @@ config ARM select HAVE_FAST_GUP if ARM_LPAE select HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL select HAVE_FUNCTION_GRAPH_TRACER if !THUMB2_KERNEL && !CC_IS_CLANG - select HAVE_FUNCTION_TRACER if !XIP_KERNEL + select HAVE_FUNCTION_TRACER if !XIP_KERNEL && !(THUMB2_KERNEL && CC_IS_CLANG) select HAVE_GCC_PLUGINS select HAVE_HW_BREAKPOINT if PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7) select HAVE_IRQ_TIME_ACCOUNTING -- 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 14/14] [RFC] ARM: forbid ftrace with clang and thumb2_kernel Date: Tue, 28 Sep 2021 17:41:43 +0200 [thread overview] Message-ID: <20210928154143.2106903-15-arnd@kernel.org> (raw) In-Reply-To: <20210928154143.2106903-1-arnd@kernel.org> From: Arnd Bergmann <arnd@arndb.de> clang fails to build kernels with THUMB2 and FUNCTION_TRACER enabled when there is any inline asm statement containing the frame pointer register r7: arch/arm/mach-versatile/dcscb.c:95:2: error: inline asm clobber list contains reserved registers: R7 [-Werror,-Winline-asm] arch/arm/mach-exynos/mcpm-exynos.c:154:2: error: inline asm clobber list contains reserved registers: R7 [-Werror,-Winline-asm] arch/arm/probes/kprobes/actions-thumb.c:449:3: error: inline asm clobber list contains reserved registers: R7 [-Werror,-Winline-asm] Apparently gcc should also have warned about this, and the configuration is actually invalid, though there is some disagreement on the bug trackers about this. Link: https://bugs.llvm.org/show_bug.cgi?id=45826 Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94986 Signed-off-by: Arnd Bergmann <arnd@arndb.de> --- arch/arm/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 0d4f3e2d50ad..7ea95bb40004 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -91,7 +91,7 @@ config ARM select HAVE_FAST_GUP if ARM_LPAE select HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL select HAVE_FUNCTION_GRAPH_TRACER if !THUMB2_KERNEL && !CC_IS_CLANG - select HAVE_FUNCTION_TRACER if !XIP_KERNEL + select HAVE_FUNCTION_TRACER if !XIP_KERNEL && !(THUMB2_KERNEL && CC_IS_CLANG) select HAVE_GCC_PLUGINS select HAVE_HW_BREAKPOINT if PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7) select HAVE_IRQ_TIME_ACCOUNTING -- 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 ` [PATCH 02/14] ARM: patch: fix BE32 compilation Arnd Bergmann 2021-09-28 15:41 ` 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 ` Arnd Bergmann [this message] 2021-09-28 15:41 ` [PATCH 14/14] [RFC] ARM: forbid ftrace with clang and thumb2_kernel 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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