From: Nathan Chancellor <nathan@kernel.org> To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org> Cc: Nick Desaulniers <ndesaulniers@google.com>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com, Nathan Chancellor <nathan@kernel.org> Subject: [PATCH] arm64: Restrict ARM64_BTI_KERNEL to clang 12.0.0 and newer Date: Thu, 8 Jul 2021 17:06:27 -0700 [thread overview] Message-ID: <20210709000627.3183718-1-nathan@kernel.org> (raw) Commit 97fed779f2a6 ("arm64: bti: Provide Kconfig for kernel mode BTI") disabled CONFIG_ARM64_BTI_KERNEL when CONFIG_GCOV_KERNEL was enabled and compilign with clang because of warnings that occur because LLVM was not emitting PAC/BTI instructions for compiler generated functions. This was an adequate fix to avoid the warnings with allmodconfig until commit 51c2ee6d121c ("Kconfig: Introduce ARCH_WANTS_NO_INSTR and CC_HAS_NO_PROFILE_FN_ATTR"), which prevented CONFIG_GCOV_KERNEL from being selected with clang 12.0.0 and older because it does not support the no_profile_instrument_function attribute. As a result, CONFIG_ARM64_BTI_KERNEL gets enabled and there are more warnings of this nature. Rather than play whack-a-mole with the config options, just update this condition to require clang 12.0.0, which should have all of the issues ironed out. Link: https://github.com/ClangBuiltLinux/linux/issues/1428 Link: https://github.com/ClangBuiltLinux/continuous-integration2/runs/3010034706?check_suite_focus=true Link: https://github.com/ClangBuiltLinux/continuous-integration2/runs/3010035725?check_suite_focus=true Signed-off-by: Nathan Chancellor <nathan@kernel.org> --- arch/arm64/Kconfig | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index e07e7de9ac49..c2127595980f 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -1605,7 +1605,8 @@ config ARM64_BTI_KERNEL depends on CC_HAS_BRANCH_PROT_PAC_RET_BTI # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94697 depends on !CC_IS_GCC || GCC_VERSION >= 100100 - depends on !(CC_IS_CLANG && GCOV_KERNEL) + # https://reviews.llvm.org/D85649 + depends on !CC_IS_CLANG || CLANG_VERSION >= 120000 depends on (!FUNCTION_GRAPH_TRACER || DYNAMIC_FTRACE_WITH_REGS) help Build the kernel with Branch Target Identification annotations base-commit: f55966571d5eb2876a11e48e798b4592fa1ffbb7 -- 2.32.0.93.g670b81a890
WARNING: multiple messages have this Message-ID (diff)
From: Nathan Chancellor <nathan@kernel.org> To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org> Cc: Nick Desaulniers <ndesaulniers@google.com>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com, Nathan Chancellor <nathan@kernel.org> Subject: [PATCH] arm64: Restrict ARM64_BTI_KERNEL to clang 12.0.0 and newer Date: Thu, 8 Jul 2021 17:06:27 -0700 [thread overview] Message-ID: <20210709000627.3183718-1-nathan@kernel.org> (raw) Commit 97fed779f2a6 ("arm64: bti: Provide Kconfig for kernel mode BTI") disabled CONFIG_ARM64_BTI_KERNEL when CONFIG_GCOV_KERNEL was enabled and compilign with clang because of warnings that occur because LLVM was not emitting PAC/BTI instructions for compiler generated functions. This was an adequate fix to avoid the warnings with allmodconfig until commit 51c2ee6d121c ("Kconfig: Introduce ARCH_WANTS_NO_INSTR and CC_HAS_NO_PROFILE_FN_ATTR"), which prevented CONFIG_GCOV_KERNEL from being selected with clang 12.0.0 and older because it does not support the no_profile_instrument_function attribute. As a result, CONFIG_ARM64_BTI_KERNEL gets enabled and there are more warnings of this nature. Rather than play whack-a-mole with the config options, just update this condition to require clang 12.0.0, which should have all of the issues ironed out. Link: https://github.com/ClangBuiltLinux/linux/issues/1428 Link: https://github.com/ClangBuiltLinux/continuous-integration2/runs/3010034706?check_suite_focus=true Link: https://github.com/ClangBuiltLinux/continuous-integration2/runs/3010035725?check_suite_focus=true Signed-off-by: Nathan Chancellor <nathan@kernel.org> --- arch/arm64/Kconfig | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index e07e7de9ac49..c2127595980f 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -1605,7 +1605,8 @@ config ARM64_BTI_KERNEL depends on CC_HAS_BRANCH_PROT_PAC_RET_BTI # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94697 depends on !CC_IS_GCC || GCC_VERSION >= 100100 - depends on !(CC_IS_CLANG && GCOV_KERNEL) + # https://reviews.llvm.org/D85649 + depends on !CC_IS_CLANG || CLANG_VERSION >= 120000 depends on (!FUNCTION_GRAPH_TRACER || DYNAMIC_FTRACE_WITH_REGS) help Build the kernel with Branch Target Identification annotations base-commit: f55966571d5eb2876a11e48e798b4592fa1ffbb7 -- 2.32.0.93.g670b81a890 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2021-07-09 0:09 UTC|newest] Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-07-09 0:06 Nathan Chancellor [this message] 2021-07-09 0:06 ` [PATCH] arm64: Restrict ARM64_BTI_KERNEL to clang 12.0.0 and newer Nathan Chancellor 2021-07-12 12:24 ` Will Deacon 2021-07-12 12:24 ` Will Deacon 2021-07-12 17:04 ` Nick Desaulniers 2021-07-12 17:04 ` Nick Desaulniers 2021-07-12 21:46 ` [PATCH v2] " Nathan Chancellor 2021-07-12 21:46 ` Nathan Chancellor 2021-07-12 23:15 ` Nick Desaulniers 2021-07-12 23:15 ` Nick Desaulniers 2021-07-13 18:08 ` Will Deacon 2021-07-13 18:08 ` Will Deacon
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