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| author | David Miller <davem@davemloft.net> | 2013-10-02 14:25:09 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-10-13 19:08:33 -0400 |
| commit | 4dc59be5037f059421e302890165d5ccf6a386ac (patch) | |
| tree | 7033ec9842b1deec415f7b4d0fb2ed617f8bc12b /mm | |
| parent | 04e7d3c0bcd0905d6977b926fd378280c0645e09 (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 'mm')
0 files changed, 0 insertions, 0 deletions