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authorDavid Miller <davem@davemloft.net>2013-10-02 14:25:09 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-10-13 16:08:33 -0700
commit4dc59be5037f059421e302890165d5ccf6a386ac (patch)
tree7033ec9842b1deec415f7b4d0fb2ed617f8bc12b /include
parent04e7d3c0bcd0905d6977b926fd378280c0645e09 (diff)
mm: Fix generic hugetlb pte check return type.
[ Upstream commit 26794942461f438a6bc725ec7294b08a6bd782c4 ] 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/asm-generic/hugetlb.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/asm-generic/hugetlb.h b/include/asm-generic/hugetlb.h
index d06079c774a..99b490b4d05 100644
--- a/include/asm-generic/hugetlb.h
+++ b/include/asm-generic/hugetlb.h
@@ -6,12 +6,12 @@ static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
return mk_pte(page, pgprot);
}
-static inline int huge_pte_write(pte_t pte)
+static inline unsigned long huge_pte_write(pte_t pte)
{
return pte_write(pte);
}
-static inline int huge_pte_dirty(pte_t pte)
+static inline unsigned long huge_pte_dirty(pte_t pte)
{
return pte_dirty(pte);
}