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| author | Dave Kleikamp <shaggy@linux.vnet.ibm.com> | 2009-01-14 09:09:34 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-01-16 16:15:16 +1100 |
| commit | 9ba0fdbfaed2e74005d87fab948c5522b86ff733 (patch) | |
| tree | 723f6080b37a16e7b0a75e017c0886898c58b7d7 | |
| parent | 5d9ee3ff3dbf815cd9ee18c166bb9b538e8057d2 (diff) | |
| download | linux-9ba0fdbfaed2e74005d87fab948c5522b86ff733.tar.gz linux-9ba0fdbfaed2e74005d87fab948c5522b86ff733.tar.bz2 linux-9ba0fdbfaed2e74005d87fab948c5522b86ff733.zip | |
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.c | 11 |
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", |