linux-kernel - Re: [PATCH v2] fix ___SYNC () build error when PROFILE_ALL

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Message-ID: <CAOd03yTc3+Sa4zsPQCu3dHiJfuUf-kOMxeUH6rm4u4Z6Hv2BQQ@mail.gmail.com>
Date:   Fri, 28 Apr 2023 15:13:32 +0800
From:   genjian zhang <zhanggenjian123@...il.com>
To:     tsbogend@...ha.franken.de, rdunlap@...radead.org
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        Genjian Zhang <zhanggenjian@...inos.cn>,
        k2ci <kernel-bot@...inos.cn>
Subject: Re: [PATCH v2] fix ___SYNC () build error when PROFILE_ALL_BRANCHES
 is enabled

On Thu, Apr 27, 2023 at 11:05 PM Genjian <zhanggenjian123@...il.com> wrote:
>
> From: Genjian Zhang <zhanggenjian@...inos.cn>
>
> compiler error (mips-linux-gnu-gcc (Debian 10.2.1-6) 10.2.1 20210110):
>
> {standard input}: Assembler messages:
> {standard input}:171: Error: found '(', expected: ')'
> {standard input}:171: Error: found '(', expected: ')'
> {standard input}:171: Error: non-constant expression in ".if" statement
> {standard input}:171: Error: junk at end of line, first unrecognized
> character is `('
>
> Expands ___SYNC() macros. However, 'if' statement will be wrong
> assembly.This Compilers report a lot of errors like the above.
> this problem is caused by the #define of if() in
> include/linux/compiler.h when CONFIG_PROFILE_ALL_BRANCHES
> is set. Move '.if' into quoted strings to fix it.
>
> Reported-by: k2ci <kernel-bot@...inos.cn>
> Signed-off-by: Genjian Zhang <zhanggenjian@...inos.cn>
> ---
>  arch/mips/include/asm/sync.h | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/arch/mips/include/asm/sync.h b/arch/mips/include/asm/sync.h
> index aabd097933fe..56a4f6f6cdef 100644
> --- a/arch/mips/include/asm/sync.h
> +++ b/arch/mips/include/asm/sync.h
> @@ -175,7 +175,7 @@
>   */
>  #ifdef CONFIG_CPU_HAS_SYNC
>  # define ____SYNC(_type, _reason, _else)                       \
> -       .if     (( _type ) != -1) && ( _reason );               \
> +       ((_type) != -1) && (_reason);                           \
>         .set    push;                                           \
>         .set    MIPS_ISA_LEVEL_RAW;                             \
>         .rept   __SYNC_rpt(_type);                              \
> @@ -192,13 +192,14 @@
>  /*
>   * Preprocessor magic to expand macros used as arguments before we insert them
>   * into assembly code.
> + * In addition,'if' cannot be enabled.
>   */
>  #ifdef __ASSEMBLY__
>  # define ___SYNC(type, reason, else)                           \
> -       ____SYNC(type, reason, else)
> +       .if     ____SYNC(type, reason, else)
>  #else
>  # define ___SYNC(type, reason, else)                           \
> -       __stringify(____SYNC(type, reason, else))
> +       ".if"   __stringify(____SYNC(type, reason, else))
>  #endif
>
>  #define __SYNC(type, reason)                                   \
> --
> 2.25.1
>

This patch does not take into account the situation that CPU_HAS_SYNC
is not set. I will revise it later.

Thanks.
-- 
Genjian