linux-kernel - Re: [PATCH] kcov: improve CONFIG_ARCH_HAS

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Message-ID: <CACT4Y+apUSRP2BwW7P-R4Mj0dZjHG++neM5wjH6RM4ae7VUVcg@mail.gmail.com>
Date:   Fri, 12 Apr 2019 12:31:10 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Mark Rutland <mark.rutland@....com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] kcov: improve CONFIG_ARCH_HAS_KCOV help text

On Fri, Apr 12, 2019 at 12:27 PM Mark Rutland <mark.rutland@....com> wrote:
>
> The help text for CONFIG_ARCH_HAS_KCOV is stale, and describes the
> feature as being enabled only for x86_64, when it is now enabled for
> several architectures, including arm, arm64, powerpc, and s390.
>
> Let's remove that stale help text, and update it along the lines of hat
> for ARCH_HAS_FORTIFY_SOURCE, better describing when an architecture
> should select CONFIG_ARCH_HAS_KCOV.
>
> Signed-off-by: Mark Rutland <mark.rutland@....com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Dmitry Vyukov <dvyukov@...gle.com>
> Cc: Kees Cook <keescook@...omium.org>
> ---
>  lib/Kconfig.debug | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index 0d9e81779e37..00dbcdbc9a0d 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -753,9 +753,9 @@ endmenu # "Memory Debugging"
>  config ARCH_HAS_KCOV
>         bool
>         help
> -         KCOV does not have any arch-specific code, but currently it is enabled
> -         only for x86_64. KCOV requires testing on other archs, and most likely
> -         disabling of instrumentation for some early boot code.
> +         An architecture should select this when it can successfully
> +         build and run with CONFIG_KCOV. This typically requires
> +         disabling instrumentation for some early boot code.
>
>  config CC_HAS_SANCOV_TRACE_PC
>         def_bool $(cc-option,-fsanitize-coverage=trace-pc)
> --
> 2.11.0


Acked-by: Dmitry Vyukov <dvyukov@...gle.com>