Re: [PATCH 6/8] Direct Migration V2: Avoid writeback / page_migrate() method

[Christoph Lameter <clameter@engr.sgi.com>]

On Wed, 9 Nov 2005, Nikita Danilov wrote:

>  > +#ifdef CONFIG_MIGRATION
>  > +extern int buffer_migrate_page(struct page *, struct page *);
>  > +#else
>  > +#define buffer_migrate_page(a,b) NULL
>  > +#endif
> 
> Depending on the CONFIG_MIGRATION, the type of buffer_migrate_page(a,b)
> expansion is either int or void *, which doesn't look right.

But its right. You need to think about buffer_migrate_page as a pointer to 
a function.

> Moreover below you have initializations
> 
>         .migrate_page		= buffer_migrate_page,
> 
> that wouldn't compile when CONFIG_MIGRATION is not defined (as macro
> requires two arguments).

NULL is a void * pointer which should work.

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