linux-kernel - Re: [PATCH 1/2] arm64: Improve error reporting on set_pte

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Date:	Wed, 16 Dec 2015 11:15:25 +0000
From:	James Morse <james.morse@....com>
To:	Andrew Pinski <pinskia@...il.com>
CC:	Catalin Marinas <catalin.marinas@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Andrew Pinski <apinski@...ium.com>,
	Ming Lei <tom.leiming@...il.com>,
	Will Deacon <will.deacon@....com>,
	David Daney <ddaney@...iumnetworks.com>
Subject: Re: [PATCH 1/2] arm64: Improve error reporting on set_pte_at() checks

Hi Andrew,

On 16/12/15 03:01, Andrew Pinski wrote:
> On Tue, Dec 9, 2015 at 17:26:56, Catalin Marinas
> <catalin.marinas@....com> wrote:
>>
>> Currently the BUG_ON() checks do not give enough information about the PTEs being set. This patch changes BUG_ON to WARN_ONCE and dumps the values of the old and new PTEs.
> 
> 
> This change broke building the mantis driver:
> 
> In file included from ./arch/arm64/include/asm/io.h:30:0,
>                  from drivers/media/pci/mantis/mantis_i2c.c:21:
> ./arch/arm64/include/asm/pgtable.h: In function ‘set_pte_at’:
> ./arch/arm64/include/asm/pgtable.h:281:3: error: implicit declaration
> of function ‘BUILD_BUG_ON_INVALID’
> [-Werror=implicit-function-declaration]
>    VM_WARN_ONCE(!pte_young(pte),
>    ^

This is due to a missing include in include/linux/mmdebug.h, which
Julien Grall saw with CONFIG_XEN & !CONFIG_DEBUG_VM. There was some
discussion at [0], and a patch at [1].

The quick-and-dirty workaround is to toggle CONFIG_DEBUG_VM. It should
be fixed in the next rc.


Thanks,

James

[0] https://lkml.org/lkml/2015/12/14/489
[1] http://www.spinics.net/lists/linux-mm/msg98868.html
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