linux-kernel - Re: linux-next: build failure after merge of the mm tree

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Date:   Wed, 11 May 2022 16:27:09 +0800
From:   Baolin Wang <baolin.wang@...ux.alibaba.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the mm tree

Hi Stephen,

On 5/11/2022 4:15 PM, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the mm tree, today's linux-next build (sparc64 defconfig)
> failed like this:
> 
> In file included from include/linux/hugetlb.h:757,
>                   from arch/sparc/mm/hugetlbpage.c:11:
> arch/sparc/include/asm/hugetlb.h: In function 'huge_ptep_clear_flush':
> arch/sparc/include/asm/hugetlb.h:27:1: error: no return statement in function returning non-void [-Werror=return-type]
>     27 | }
>        | ^
> 
> (and many more)
> 
> Caused by commit
> 
>    083af99303b9 ("mm: change huge_ptep_clear_flush() to return the original pte")
> 
> I applied the following hack to make it build.
> 
> From: Stephen Rothwell <sfr@...b.auug.org.au>
> Date: Wed, 11 May 2022 18:10:56 +1000
> Subject: [PATCH] fix up for "mm: change huge_ptep_clear_flush() to return the original pte"
> 
> Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>

Sorry for my mistake. LGTM.
Reviewed-by: Baolin Wang <baolin.wang@...ux.alibaba.com>

> ---
>   arch/sparc/include/asm/hugetlb.h | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/arch/sparc/include/asm/hugetlb.h b/arch/sparc/include/asm/hugetlb.h
> index b50aa6f8f9ab..0a26cca24232 100644
> --- a/arch/sparc/include/asm/hugetlb.h
> +++ b/arch/sparc/include/asm/hugetlb.h
> @@ -24,6 +24,7 @@ pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
>   static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
>   					  unsigned long addr, pte_t *ptep)
>   {
> +	return *ptep;
>   }
>   
>   #define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT