Messages in this thread Patch in this message | | | Date | Thu, 18 Nov 2021 19:54:21 +0100 | From | Peter Zijlstra <> | Subject | [PATCH] x86: Use -mindirect-branch-cs-prefix for RETPOLINE builds |
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In order to further enable commit:
bbe2df3f6b6d ("x86/alternative: Try inline spectre_v2=retpoline,amd")
add the new GCC flag -mindirect-branch-cs-prefix:
https://gcc.gnu.org/g:2196a681d7810ad8b227bf983f38ba716620545e
to RETPOLINE=y builds. This should allow fully inlining retpoline,amd for GCC builds.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> --- Makefile | 1 + 1 file changed, 1 insertion(+)
diff --git a/Makefile b/Makefile index 9e12c14ea0fb..5fd5b5f091ae 100644 --- a/Makefile +++ b/Makefile @@ -690,6 +690,7 @@ endif ifdef CONFIG_CC_IS_GCC RETPOLINE_CFLAGS := $(call cc-option,-mindirect-branch=thunk-extern -mindirect-branch-register) +RETPOLINE_CFLAGS += $(call cc-option,-mindirect-branch-cs-prefix) RETPOLINE_VDSO_CFLAGS := $(call cc-option,-mindirect-branch=thunk-inline -mindirect-branch-register) endif ifdef CONFIG_CC_IS_CLANG
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