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authorDave Kleikamp <shaggy@linux.vnet.ibm.com>2009-01-14 09:09:34 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-01-16 16:15:16 +1100
commit9ba0fdbfaed2e74005d87fab948c5522b86ff733 (patch)
tree723f6080b37a16e7b0a75e017c0886898c58b7d7
parent5d9ee3ff3dbf815cd9ee18c166bb9b538e8057d2 (diff)
powerpc: is_hugepage_only_range() must account for both 4kB and 64kB slices
powerpc: is_hugepage_only_range() must account for both 4kB and 64kB slices The subpage_prot syscall fails on second and subsequent calls for a given region, because is_hugepage_only_range() is mis-identifying the 4 kB slices when the process has a 64 kB page size. Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
-rw-r--r--arch/powerpc/mm/slice.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/powerpc/mm/slice.c b/arch/powerpc/mm/slice.c
index db44e02e045b..ba5194817f8a 100644
--- a/arch/powerpc/mm/slice.c
+++ b/arch/powerpc/mm/slice.c
@@ -710,9 +710,18 @@ int is_hugepage_only_range(struct mm_struct *mm, unsigned long addr,
unsigned long len)
{
struct slice_mask mask, available;
+ unsigned int psize = mm->context.user_psize;
mask = slice_range_to_mask(addr, len);
- available = slice_mask_for_size(mm, mm->context.user_psize);
+ available = slice_mask_for_size(mm, psize);
+#ifdef CONFIG_PPC_64K_PAGES
+ /* We need to account for 4k slices too */
+ if (psize == MMU_PAGE_64K) {
+ struct slice_mask compat_mask;
+ compat_mask = slice_mask_for_size(mm, MMU_PAGE_4K);
+ or_mask(available, compat_mask);
+ }
+#endif
#if 0 /* too verbose */
slice_dbg("is_hugepage_only_range(mm=%p, addr=%lx, len=%lx)\n",