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| author | David Gibson <david@gibson.dropbear.id.au> | 2005-11-24 13:34:56 +1100 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2005-11-25 22:12:45 +1100 |
| commit | 9a94c5793a7b44720f19ebb71b636bc9c31b44d8 (patch) | |
| tree | df25ab16bb1e586d671160dd26d3117aa43d77cf /arch/powerpc | |
| parent | 26925c5910ab77fc95b4d8bb6d98780b50ab1e5a (diff) | |
| download | blackbird-op-linux-9a94c5793a7b44720f19ebb71b636bc9c31b44d8.tar.gz blackbird-op-linux-9a94c5793a7b44720f19ebb71b636bc9c31b44d8.zip | |
[PATCH] powerpc: More hugepage boundary case fixes
Blah. The patch [0] I recently sent fixing errors with
in_hugepage_area() and prepare_hugepage_range() for powerpc itself has
an off-by-one bug. Furthermore, the related functions
touches_hugepage_*_range() and within_hugepage_*_range() are also
buggy. Some of the bugs, like those addressed in [0] originated with
commit 7d24f0b8a53261709938ffabe3e00f88f6498df9 where we tweaked the
semantics of where hugepages are allowed. Other bugs have been there
essentially forever, and are due to the undefined behaviour of '<<'
with shift counts greater than the type width (LOW_ESID_MASK could
return non-zero for high ranges with the right congruences).
The good news is that I now have a testsuite which should pick up
things like this if they creep in again.
[0] "powerpc-fix-for-hugepage-areas-straddling-4gb-boundary"
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/mm/hugetlbpage.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c index f867bba893ca..6bc9dbad7dea 100644 --- a/arch/powerpc/mm/hugetlbpage.c +++ b/arch/powerpc/mm/hugetlbpage.c @@ -295,7 +295,7 @@ int prepare_hugepage_range(unsigned long addr, unsigned long len) if (addr < 0x100000000UL) err = open_low_hpage_areas(current->mm, LOW_ESID_MASK(addr, len)); - if ((addr + len) >= 0x100000000UL) + if ((addr + len) > 0x100000000UL) err = open_high_hpage_areas(current->mm, HTLB_AREA_MASK(addr, len)); if (err) { |
