3.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: David Miller <davem@xxxxxxxxxxxxx>
[ 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@xxxxxxxxxx>
Tested-by: Gurudas Pai <gurudas.pai@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
include/asm-generic/hugetlb.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/include/asm-generic/hugetlb.h
+++ b/include/asm-generic/hugetlb.h
@@ -6,12 +6,12 @@ static inline pte_t mk_huge_pte(struct p
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);
}
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