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

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Date:   Wed, 24 Mar 2021 09:44:54 +1000
From:   Nicholas Piggin <npiggin@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>
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 akpm-current tree

Excerpts from Stephen Rothwell's message of March 24, 2021 6:58 am:
> 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.

Oh I missed your first mail, thanks for the ping. I'll have a look 
today.

Thanks,
Nick