linux-kernel - Re: [PATCH] arm64/mm: fix variable 'pud' set but not used

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Date:   Thu, 1 Aug 2019 13:04:06 +0100
From:   Will Deacon <will@...nel.org>
To:     Qian Cai <cai@....pw>
Cc:     catalin.marinas@....com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64/mm: fix variable 'pud' set but not used

On Wed, Jul 31, 2019 at 04:05:45PM -0400, Qian Cai wrote:
> GCC throws a warning,
> 
> arch/arm64/mm/mmu.c: In function 'pud_free_pmd_page':
> arch/arm64/mm/mmu.c:1033:8: warning: variable 'pud' set but not used
> [-Wunused-but-set-variable]
>   pud_t pud;
>         ^~~
> 
> because pud_table() is a macro and compiled away. Fix it by making it a
> static inline function and for pud_sect() as well.
> 
> Signed-off-by: Qian Cai <cai@....pw>
> ---
>  arch/arm64/include/asm/pgtable.h | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
> index 3f5461f7b560..541cb4a15341 100644
> --- a/arch/arm64/include/asm/pgtable.h
> +++ b/arch/arm64/include/asm/pgtable.h
> @@ -447,8 +447,15 @@ extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
>  				 PMD_TYPE_SECT)
>  
>  #if defined(CONFIG_ARM64_64K_PAGES) || CONFIG_PGTABLE_LEVELS < 3
> -#define pud_sect(pud)		(0)
> -#define pud_table(pud)		(1)
> +static inline bool pud_sect(pud_t pud)
> +{
> +	return false;
> +}
> +
> +static inline bool pud_table(pud_t pud)
> +{
> +	return true;
> +}

Applied for 5.3.

Will