linux-kernel - Re: [PATCH] sparse: use the _Generic() version of __unqual_scalar

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Message-ID: <20200619082342.GB6500@willie-the-truck>
Date:   Fri, 19 Jun 2020 09:23:43 +0100
From:   Will Deacon <will@...nel.org>
To:     Luc Van Oostenryck <luc.vanoostenryck@...il.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, Marco Elver <elver@...gle.com>,
        Borislav Petkov <bp@...e.de>
Subject: Re: [PATCH] sparse: use the _Generic() version of
 __unqual_scalar_typeof()

On Fri, Jun 19, 2020 at 12:26:20AM +0200, Luc Van Oostenryck wrote:
> If the file is being checked with sparse, use the version of
> __unqual_scalar_typeof() using _Generic(), leaving the unoptimized
> version only for the oldest versions of GCC.
> 
> This reverts commit
>   b398ace5d2ea ("compiler_types.h: Use unoptimized __unqual_scalar_typeof for sparse")
> 
> Note: a recent version of sparse will be needed (minimum v0.6.2-rc2
>        or later than 2020-05-28).
> 
> Cc: Marco Elver <elver@...gle.com>
> Cc: Borislav Petkov <bp@...e.de>
> Cc: Will Deacon <will@...nel.org>
> Link: https://marc.info/?l=linux-sparse&m=159233481816454
> Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@...il.com>
> ---
>  include/linux/compiler_types.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h
> index e368384445b6..e34a1080f36b 100644
> --- a/include/linux/compiler_types.h
> +++ b/include/linux/compiler_types.h
> @@ -254,7 +254,7 @@ struct ftrace_likely_data {
>   * __unqual_scalar_typeof(x) - Declare an unqualified scalar type, leaving
>   *			       non-scalar types unchanged.
>   */
> -#if (defined(CONFIG_CC_IS_GCC) && CONFIG_GCC_VERSION < 40900) || defined(__CHECKER__)
> +#if defined(CONFIG_CC_IS_GCC) && CONFIG_GCC_VERSION < 40900
>  /*
>   * We build this out of a couple of helper macros in a vain attempt to
>   * help you keep your lunch down while reading it.

If you don't mind forcing people to update sparse, then:

Acked-by: Will Deacon <will@...nel.org>

Will