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The include/asm-generic/hugetlb.h stubs that just vector huge_pte_*() calls to the pte_*() implementations won't work in certain situations. x86 and sparc, for example, return "unsigned long" from the bit checks, and just go "return pte_val(pte) & PTE_BIT_FOO;" But since huge_pte_*() returns 'int', if any high bits on 64-bit are relevant, they get chopped off. The net effect is that we can loop forever trying to COW a huge page, because the huge_pte_write() check signals false all the time. Reported-by: Gurudas Pai <gurudas.pai@oracle.com> Tested-by: Gurudas Pai <gurudas.pai@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net> Acked-by: David Rientjes <rientjes@google.com>
40 lines
758 B
C
40 lines
758 B
C
#ifndef _ASM_GENERIC_HUGETLB_H
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#define _ASM_GENERIC_HUGETLB_H
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static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
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{
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return mk_pte(page, pgprot);
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}
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static inline unsigned long huge_pte_write(pte_t pte)
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{
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return pte_write(pte);
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}
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static inline unsigned long huge_pte_dirty(pte_t pte)
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{
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return pte_dirty(pte);
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}
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static inline pte_t huge_pte_mkwrite(pte_t pte)
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{
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return pte_mkwrite(pte);
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}
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static inline pte_t huge_pte_mkdirty(pte_t pte)
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{
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return pte_mkdirty(pte);
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}
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static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot)
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{
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return pte_modify(pte, newprot);
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}
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static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep)
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{
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pte_clear(mm, addr, ptep);
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}
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#endif /* _ASM_GENERIC_HUGETLB_H */
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