linux-kernel - Re: [PATCH 1/3] mm: generalize VM_BUG

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Date:	Wed, 01 Oct 2014 07:39:33 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	Dave Hansen <dave.hansen@...el.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] mm: generalize VM_BUG_ON() macros

On 10/01/2014 07:31 AM, Kirill A. Shutemov wrote:
> +#define _VM_DUMP(arg, cond) do {					\
> +	if (__builtin_types_compatible_p(typeof(*arg), struct page))	\
> +		dump_page((struct page *) arg,				\
> +				"VM_BUG_ON(" __stringify(cond)")");	\
> +	else if (__builtin_types_compatible_p(typeof(*arg),		\
> +				struct vm_area_struct))			\
> +		dump_vma((struct vm_area_struct *) arg);		\
> +	else if (__builtin_types_compatible_p(typeof(*arg),		\
> +				struct mm_struct))			\
> +		dump_mm((struct mm_struct *) arg);			\
> +	else								\
> +		BUILD_BUG();						\
> +} while(0)

__same_type() instead of __builtin_types_compatible_p() would look nicer,
but I don't think that all compilers support that:

	include/linux/compiler-intel.h:/* Intel ECC compiler doesn't support __builtin_types_compatible_p() */

So it would effectively disable VM_BUG_ONs on Intel's compiler.


Thanks,
Sasha
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