hugetlbfs: fix bug in pgoff overflow checking

This is a fix for a regression in 32 bit kernels caused by an invalid
check for pgoff overflow in hugetlbfs mmap setup.  The check incorrectly
specified that the size of a loff_t was the same as the size of a long.
The regression prevents mapping hugetlbfs files at offsets greater than
4GB on 32 bit kernels.

On 32 bit kernels conversion from a page based unsigned long can not
overflow a loff_t byte offset.  Therefore, skip this check if
sizeof(unsigned long) != sizeof(loff_t).

Link: http://lkml.kernel.org/r/[email protected]
Fixes: 63489f8e8211 ("hugetlbfs: check for pgoff value overflow")
Reported-by: Dan Rue <[email protected]>
Signed-off-by: Mike Kravetz <[email protected]>
Tested-by: Anders Roxell <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Yisheng Xie <[email protected]>
Cc: "Kirill A . Shutemov" <[email protected]>
Cc: Nic Losby <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions