linux-kernel - Re: "mm: introduce dump

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Message-ID: <540DBD62.5040605@oracle.com>
Date:	Mon, 08 Sep 2014 10:29:54 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
CC:	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-arm-kernel@...ts.infradead.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: "mm: introduce dump_vma fix 2" still broken

On 09/08/2014 07:02 AM, Arnd Bergmann wrote:
> 
> I saw this commit today in linux-next, which fixes a build error, but introduces
> a new warning:
> 
> commit a60224c708f880dd937b352b7461cbf14e93012d
> Author: Stephen Rothwell <sfr@...b.auug.org.au>
> Date:   Mon Sep 8 19:41:54 2014 +1000
> 
>     mm: introduce dump_vma fix 2
>     
>     Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index cb510c08073b..0de60769bcf6 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -6739,7 +6739,7 @@ void dump_vma(const struct vm_area_struct *vma)
>                 "prot %lx anon_vma %p vm_ops %p\n"
>                 "pgoff %lx file %p private_data %p\n",
>                 vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next,
> -               vma->vm_prev, vma->vm_mm, vma->vm_page_prot.pgprot,
> +               vma->vm_prev, vma->vm_mm, pgprot_val(vma->vm_page_prot),
>                 vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
>                 vma->vm_file, vma->vm_private_data);
>         dump_flags(vma->vm_flags, vmaflags_names, ARRAY_SIZE(vmaflags_names));
> 
> 
> /git/arm-soc/mm/page_alloc.c: In function 'dump_vma':
> /git/arm-soc/mm/page_alloc.c:6744:3: warning: format '%lx' expects argument of type 'long unsigned int', but argument 8 has type 'pgprot_t' [-Wformat=]
>    vma->vm_file, vma->vm_private_data);
>    ^
> 
> This happens on machines that use ARM LPAE, where pgprot_t is in fact
> a 64-bit integer. The simplest fix I see would be add a cast to u64
> and always print this as a 64bit value.

Hi Arnd,

The fix for the original issue would be:

	http://ozlabs.org/~akpm/mmots/broken-out/introduce-dump_vma-fix-2.patch

Which includes the casting that Stephen's patch didn't have.

Stephen, in the future, is there a way to get build fixes faster to you? From
what I understand -mm syncs up only once in a couple of days. It might make
everyone’s life much easier if build errors wouldn't drag over a week.


Thanks,
Sasha
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