linux-kernel - Re: [PATCH] arm64: Add missing linux/bug.h include in asm/pgtable.h

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Date:	Mon, 14 Dec 2015 16:22:42 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Julien Grall <julien.grall@...rix.com>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Will Deacon <will.deacon@....com>,
	linux-kernel@...r.kernel.org, stefano.stabellini@...citrix.com
Subject: Re: [PATCH] arm64: Add missing linux/bug.h include in asm/pgtable.h

On Mon, Dec 14, 2015 at 04:07:24PM +0000, Julien Grall wrote:
> Linux 4.4-rc5 doesn't build for arm64 with CONFIG_XEN=y enabled:
> 
> In file included from linux/arch/arm64/include/asm/pgtable.h:60:0,
>                  from linux/arch/arm64/include/../../arm/include/asm/xen/page.h:5,
>                  from linux/arch/arm64/include/asm/xen/page.h:1,
>                  from linux/include/xen/page.h:28,
>                  from linux/arch/arm64/xen/../../arm/xen/grant-table.c:33:
> linux/arch/arm64/include/asm/pgtable.h: In function 'set_pte_at':
> linux/include/linux/mmdebug.h:49:39: error: implicit declaration of function 'BUILD_BUG_ON_INVALID' [-Werror=implicit-function-declaration]
>  #define VM_WARN_ONCE(cond, format...) BUILD_BUG_ON_INVALID(cond)
>                                        ^
> linux/arch/arm64/include/asm/pgtable.h:281:3: note: in expansion of macro 'VM_WARN_ONCE'
>    VM_WARN_ONCE(!pte_young(pte),
>    ^
> 
> This has been introduced by commit 82d340081b6f71237373d1452e3573a5a122794c
> "arm64: Improve error reporting on set_pte_at() checks". This is because
> mmdebug.h relies on the includer to properly include the dependencies.
> 
> Signed-off-by: Julien Grall <julien.grall@...rix.com>
> 
> ---
> Cc: Stefano Stabellini <stefano.stabellini@...citrix.com>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will.deacon@....com>
> 
>     I was tempted to add the missing include in linux/mmdebug.h but I'm
>     not sure about the policy for headers inclusion in Linux.

Normally, I would say that mmdebug.h should include whichever headers it
needs but for a quicker fix, I'm fine with including linux/bug.h (and
probably removing the asm/bug.h include in asm/pgtable.h).

-- 
Catalin
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