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

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Message-ID: <20210324075852.4ed75c39@canb.auug.org.au>
Date:   Wed, 24 Mar 2021 07:58:52 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Nicholas Piggin <npiggin@...il.com>,
        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 akpm-current tree

Hi all,

On Thu, 18 Mar 2021 20:56:07 +1100 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> 
> After merging the akpm-current tree, today's linux-next build (sparc
> defconfig) failed like this:
> 
> In file included from arch/sparc/include/asm/pgtable_32.h:25:0,
>                  from arch/sparc/include/asm/pgtable.h:7,
>                  from include/linux/pgtable.h:6,
>                  from include/linux/mm.h:33,
>                  from mm/vmalloc.c:12:
> mm/vmalloc.c: In function 'vmalloc_to_page':
> include/asm-generic/pgtable-nopud.h:51:27: error: implicit declaration of function 'pud_page'; did you mean 'put_page'? [-Werror=implicit-function-declaration]
>  #define p4d_page(p4d)    (pud_page((pud_t){ p4d }))
>                            ^
> mm/vmalloc.c:643:10: note: in expansion of macro 'p4d_page'
>    return p4d_page(*p4d) + ((addr & ~P4D_MASK) >> PAGE_SHIFT);
>           ^~~~~~~~
> mm/vmalloc.c:643:25: warning: return makes pointer from integer without a cast [-Wint-conversion]
>    return p4d_page(*p4d) + ((addr & ~P4D_MASK) >> PAGE_SHIFT);
> mm/vmalloc.c:651:25: warning: return makes pointer from integer without a cast [-Wint-conversion]
>    return pud_page(*pud) + ((addr & ~PUD_MASK) >> PAGE_SHIFT);
>           ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> Caused by commit
> 
>   70d18d470920 ("mm/vmalloc: fix HUGE_VMAP regression by enabling huge pages in vmalloc_to_page")
> 
> I have applied the following hack path for today (hopefully someone can
> come up with something better):
> 
> From: Stephen Rothwell <sfr@...b.auug.org.au>
> Date: Thu, 18 Mar 2021 18:32:58 +1100
> Subject: [PATCH] hack to make SPARC32 build
> 
> Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
> ---
>  mm/vmalloc.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> index 57b7f62d25a7..96444d64129a 100644
> --- a/mm/vmalloc.c
> +++ b/mm/vmalloc.c
> @@ -640,7 +640,11 @@ struct page *vmalloc_to_page(const void *vmalloc_addr)
>  	if (p4d_none(*p4d))
>  		return NULL;
>  	if (p4d_leaf(*p4d))
> +#ifdef CONFIG_SPARC32
> +		return NULL;
> +#else
>  		return p4d_page(*p4d) + ((addr & ~P4D_MASK) >> PAGE_SHIFT);
> +#endif
>  	if (WARN_ON_ONCE(p4d_bad(*p4d)))
>  		return NULL;
>  
> @@ -648,7 +652,11 @@ struct page *vmalloc_to_page(const void *vmalloc_addr)
>  	if (pud_none(*pud))
>  		return NULL;
>  	if (pud_leaf(*pud))
> +#ifdef CONFIG_SPARC32
> +		return NULL;
> +#else
>  		return pud_page(*pud) + ((addr & ~PUD_MASK) >> PAGE_SHIFT);
> +#endif
>  	if (WARN_ON_ONCE(pud_bad(*pud)))
>  		return NULL;
>  
> -- 
> 2.30.0

I am still applying this hack.
-- 
Cheers,
Stephen Rothwell

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