Messages in this thread Patch in this message | | | From | Nadav Amit <> | Subject | [PATCH] x86/retpoline: change RETPOLINE into CONFIG_RETPOLINE | Date | Mon, 31 Dec 2018 15:42:53 -0800 |
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A recent enhancement intentionally fails the kernel build if the compiler does not support retpolines and CONFIG_RETPOLINE is set.
However, the patch that introduced it did not change RETPOLINE macro references into CONFIG_RETPOLINE ones. As a result, indirect branches that are used by init functions are not kept (i.e., they use retpolines), and modules that do not use retpolines are marked as retpoline-safe.
Fix it be changing RETPOLINE into CONFIG_RETPOLINE.
Fixes: 4cd24de3a098 ("x86/retpoline: Make CONFIG_RETPOLINE depend on compiler support") Cc: Peter Zijlstra <peterz@infradead.org> Cc: Zhenzhong Duan <zhenzhong.duan@oracle.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: David Woodhouse <dwmw@amazon.co.uk> Cc: Andy Lutomirski <luto@kernel.org> Cc: Masahiro Yamada <yamada.masahiro@socionext.com> Cc: stable@vger.kernel.org Signed-off-by: Nadav Amit <namit@vmware.com> --- arch/x86/kernel/cpu/bugs.c | 2 +- include/linux/compiler-gcc.h | 2 +- include/linux/module.h | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index 8654b8b0c848..1de0f4170178 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -215,7 +215,7 @@ static enum spectre_v2_mitigation spectre_v2_enabled __ro_after_init = static enum spectre_v2_user_mitigation spectre_v2_user __ro_after_init = SPECTRE_V2_USER_NONE; -#ifdef RETPOLINE +#ifdef CONFIG_RETPOLINE static bool spectre_v2_bad_module; bool retpoline_module_ok(bool has_retpoline) diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h index 2010493e1040..977ddf2774f9 100644 --- a/include/linux/compiler-gcc.h +++ b/include/linux/compiler-gcc.h @@ -68,7 +68,7 @@ */ #define uninitialized_var(x) x = x -#ifdef RETPOLINE +#ifdef CONFIG_RETPOLINE #define __noretpoline __attribute__((__indirect_branch__("keep"))) #endif diff --git a/include/linux/module.h b/include/linux/module.h index fce6b4335e36..0c575f51fe57 100644 --- a/include/linux/module.h +++ b/include/linux/module.h @@ -817,7 +817,7 @@ static inline void module_bug_finalize(const Elf_Ehdr *hdr, static inline void module_bug_cleanup(struct module *mod) {} #endif /* CONFIG_GENERIC_BUG */ -#ifdef RETPOLINE +#ifdef CONFIG_RETPOLINE extern bool retpoline_module_ok(bool has_retpoline); #else static inline bool retpoline_module_ok(bool has_retpoline) -- 2.17.1
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