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 <sha...@linux.vnet.ibm.com>
Cc: Paul Mackerras <pau...@samba.org>
Cc: Benjamin Herrenschmidt <b...@kernel.crashing.org>
diff --git a/arch/powerpc/mm/slice.c b/arch/powerpc/mm/slice.c
index db44e02..ba51948 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",
--
David Kleikamp
IBM Linux Technology Center
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