Re: [PATCH 20/25] Do not check for compound pages during the page allocator sanity checks

[KOSAKI Motohiro]

>> inserting VM_BUG_ON(PageTail(page)) is better?
>>
>
> We already go one further with
>
> #define PAGE_FLAGS_CHECK_AT_PREP        ((1 << NR_PAGEFLAGS) - 1)
>
> ...
>
> if (.... | (page->flags & PAGE_FLAGS_CHECK_AT_PREP))
>        bad_page(page);
>
> PG_tail is in PAGE_FLAGS_CHECK_AT_PREP so we're already checking for it
> and calling bad_page() if set.

ok, good.
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