linux-kernel - Re: [PATCH] treewide: replace RETPOLINE with CONFIG

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Date:   Wed, 12 Dec 2018 16:14:05 +0800
From:   Zhenzhong Duan <zhenzhong.duan@...cle.com>
To:     WANG Chao <chao.wang@...oud.cn>, linux-kernel@...r.kernel.org
Cc:     stable@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Borislav Petkov <bp@...e.de>,
        Daniel Borkmann <daniel@...earbox.net>,
        "H . Peter Anvin" <hpa@...or.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        srinivas.eeda@...cle.com
Subject: Re: [PATCH] treewide: replace RETPOLINE with CONFIG_RETPOLINE


On 2018/12/11 0:37, WANG Chao wrote:
> Since commit 4cd24de3a098 ("x86/retpoline: Make CONFIG_RETPOLINE depend
> on compiler support"), RETPOLINE has been replaced by CONFIG_RETPOLINE.
>
> Fixes: 4cd24de3a098 ("x86/retpoline: Make CONFIG_RETPOLINE depend on compiler support")
> Signed-off-by: WANG Chao <chao.wang@...oud.cn>
> ---
>   arch/x86/kernel/cpu/bugs.c   | 2 +-
>   include/linux/compiler-gcc.h | 2 +-
>   include/linux/module.h       | 2 +-
>   scripts/mod/modpost.c        | 2 +-
>   4 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
> index 500278f5308e..e8abe3f6c10e 100644
> --- a/arch/x86/kernel/cpu/bugs.c
> +++ b/arch/x86/kernel/cpu/bugs.c
> @@ -213,7 +213,7 @@ 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)
> diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
> index 0d998c54564d..5a5b3780456f 100644
> --- a/scripts/mod/modpost.c
> +++ b/scripts/mod/modpost.c
> @@ -2157,7 +2157,7 @@ static void add_intree_flag(struct buffer *b, int is_intree)
>   /* Cannot check for assembler */
>   static void add_retpoline(struct buffer *b)
>   {
> -	buf_printf(b, "\n#ifdef RETPOLINE\n");
> +	buf_printf(b, "\n#ifdef CONFIG_RETPOLINE\n");
>   	buf_printf(b, "MODULE_INFO(retpoline, \"Y\");\n");
>   	buf_printf(b, "#endif\n");
>   }

I have no idea why I have missed these chunks. Thank you for fixing.

Reviewed-by: Zhenzhong Duan <zhenzhong.duan@...cle.com>