From: Dave Kleikamp Date: Wed, 14 Jan 2009 09:09:34 +0000 (+0000) Subject: powerpc: is_hugepage_only_range() must account for both 4kB and 64kB slices X-Git-Tag: v2.6.29-rc2~4^2~3 X-Git-Url: http://www.pilppa.org/gitweb/gitweb.cgi?p=linux-2.6-omap-h63xx.git;a=commitdiff_plain;h=9ba0fdbfaed2e74005d87fab948c5522b86ff733 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 Signed-off-by: Benjamin Herrenschmidt --- diff --git a/arch/powerpc/mm/slice.c b/arch/powerpc/mm/slice.c index db44e02e045..ba5194817f8 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",