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[PATCH] mm: restore vm_normal_page check 

Hugh is rightly concerned that the CONFIG_DEBUG_VM coverage has gone too
far in vm_normal_page, considering that we expect production kernels to be
shipped with the option turned off, and that the code has been under some
large changes recently.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Nick Piggin 2006-03-25 16:20:22 +01:00 committed by Linus Torvalds
parent f081a529f8
commit 315ab19a6d
1 changed files with 6 additions and 2 deletions
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8
mm/memory.c
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@ -395,12 +395,16 @@ struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, pte_
return NULL;
}
#ifdef CONFIG_DEBUG_VM
/*
* Add some anal sanity checks for now. Eventually,
* we should just do "return pfn_to_page(pfn)", but
* in the meantime we check that we get a valid pfn,
* and that the resulting page looks ok.
*/
if (unlikely(!pfn_valid(pfn))) {
print_bad_pte(vma, pte, addr);
return NULL;
}
#endif
/*
* NOTE! We still have PageReserved() pages in the page