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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>
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@ -395,12 +395,16 @@ struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, pte_
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return NULL;
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}
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#ifdef CONFIG_DEBUG_VM
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/*
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* Add some anal sanity checks for now. Eventually,
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* we should just do "return pfn_to_page(pfn)", but
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* in the meantime we check that we get a valid pfn,
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* and that the resulting page looks ok.
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*/
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if (unlikely(!pfn_valid(pfn))) {
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print_bad_pte(vma, pte, addr);
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return NULL;
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}
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#endif
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/*
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* NOTE! We still have PageReserved() pages in the page
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