linux-kernel - Re: [PATCH] powerpc/cacheflush: fix variable set but not used

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Date:   Thu, 27 Jun 2019 15:54:08 -0400
From:   Qian Cai <cai@....pw>
To:     mpe@...erman.id.au
Cc:     benh@...nel.crashing.org, paulus@...ba.org,
        akpm@...ux-foundation.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/cacheflush: fix variable set but not used

Ping.

On Thu, 2019-06-06 at 09:58 -0400, Qian Cai wrote:
> The powerpc's flush_cache_vmap() is defined as a macro and never use
> both of its arguments, so it will generate a compilation warning,
> 
> lib/ioremap.c: In function 'ioremap_page_range':
> lib/ioremap.c:203:16: warning: variable 'start' set but not used
> [-Wunused-but-set-variable]
> 
> Fix it by making it an inline function.
> 
> Signed-off-by: Qian Cai <cai@....pw>
> ---
>  arch/powerpc/include/asm/cacheflush.h | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/powerpc/include/asm/cacheflush.h
> b/arch/powerpc/include/asm/cacheflush.h
> index 74d60cfe8ce5..fd318f7c3eed 100644
> --- a/arch/powerpc/include/asm/cacheflush.h
> +++ b/arch/powerpc/include/asm/cacheflush.h
> @@ -29,9 +29,12 @@
>   * not expect this type of fault. flush_cache_vmap is not exactly the right
>   * place to put this, but it seems to work well enough.
>   */
> -#define flush_cache_vmap(start, end)		do { asm
> volatile("ptesync" ::: "memory"); } while (0)
> +static inline void flush_cache_vmap(unsigned long start, unsigned long end)
> +{
> +	asm volatile("ptesync" ::: "memory");
> +}
>  #else
> -#define flush_cache_vmap(start, end)		do { } while (0)
> +static inline void flush_cache_vmap(unsigned long start, unsigned long end) {
> }
>  #endif
>  
>  #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1