linux-kernel - Re: [PATCH v2] powerpc: silence unused-but-set-variable warnings

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Message-ID: <a89e6a07-da3b-e352-018a-ccfd917eaf74@c-s.fr>
Date:   Fri, 8 Mar 2019 08:08:09 +0100
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Qian Cai <cai@....pw>, benh@...nel.crashing.org, paulus@...ba.org,
        mpe@...erman.id.au
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] powerpc: silence unused-but-set-variable warnings



Le 07/03/2019 à 15:40, Qian Cai a écrit :
> pte_unmap() compiles away on some powerpc platforms, so silence the
> warnings below by making it a static inline function.
> 
> mm/memory.c: In function 'copy_pte_range':
> mm/memory.c:820:24: warning: variable 'orig_dst_pte' set but not used
> [-Wunused-but-set-variable]
> mm/memory.c:820:9: warning: variable 'orig_src_pte' set but not used
> [-Wunused-but-set-variable]
> mm/madvise.c: In function 'madvise_free_pte_range':
> mm/madvise.c:318:9: warning: variable 'orig_pte' set but not used
> [-Wunused-but-set-variable]
> mm/swap_state.c: In function 'swap_ra_info':
> mm/swap_state.c:634:15: warning: variable 'orig_pte' set but not used
> [-Wunused-but-set-variable]
> 
> Suggested-by: Christophe Leroy <christophe.leroy@....fr>
> Signed-off-by: Qian Cai <cai@....pw>

Reviewed-by: Christophe Leroy <christophe.leroy@....fr>

> ---
> 
> v2: make it a static inline function.
> 
>   arch/powerpc/include/asm/book3s/64/pgtable.h | 3 ++-
>   arch/powerpc/include/asm/nohash/64/pgtable.h | 3 ++-
>   2 files changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
> index 868fcaf56f6b..d798e33a0c86 100644
> --- a/arch/powerpc/include/asm/book3s/64/pgtable.h
> +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
> @@ -1006,7 +1006,8 @@ extern struct page *pgd_page(pgd_t pgd);
>   	(((pte_t *) pmd_page_vaddr(*(dir))) + pte_index(addr))
>   
>   #define pte_offset_map(dir,addr)	pte_offset_kernel((dir), (addr))
> -#define pte_unmap(pte)			do { } while(0)
> +
> +static inline void pte_unmap(pte_t *pte) { }
>   
>   /* to find an entry in a kernel page-table-directory */
>   /* This now only contains the vmalloc pages */
> diff --git a/arch/powerpc/include/asm/nohash/64/pgtable.h b/arch/powerpc/include/asm/nohash/64/pgtable.h
> index e77ed9761632..0384a3302fb6 100644
> --- a/arch/powerpc/include/asm/nohash/64/pgtable.h
> +++ b/arch/powerpc/include/asm/nohash/64/pgtable.h
> @@ -205,7 +205,8 @@ static inline void pgd_set(pgd_t *pgdp, unsigned long val)
>     (((pte_t *) pmd_page_vaddr(*(dir))) + (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
>   
>   #define pte_offset_map(dir,addr)	pte_offset_kernel((dir), (addr))
> -#define pte_unmap(pte)			do { } while(0)
> +
> +static inline void pte_unmap(pte_t *pte) { }
>   
>   /* to find an entry in a kernel page-table-directory */
>   /* This now only contains the vmalloc pages */
>