[PATCH 3.16 069/305] powerpc/mm/hash64: Factor out hash preload psize check
From: Ben Hutchings <hidden>
Date: 2016-08-14 10:59:12
Also in:
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3.16.37-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Michael Ellerman <mpe@ellerman.id.au> commit 8bbc9b7b001eaab8abf7e9e24edf1bb285c8d825 upstream. Currently we have a check in hash_preload() against the psize, which is only included when CONFIG_PPC_MM_SLICES is enabled. We want to expand this check in a subsequent patch, so factor it out to allow that. As a bonus it removes the #ifdef in the C code. Unfortunately we can't put this in the existing CONFIG_PPC_MM_SLICES block because it would require a forward declaration. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Ben Hutchings <redacted> --- arch/powerpc/mm/hash_utils_64.c | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-)
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c@@ -1196,6 +1196,22 @@ bail: } EXPORT_SYMBOL_GPL(hash_page); +#ifdef CONFIG_PPC_MM_SLICES +static bool should_hash_preload(struct mm_struct *mm, unsigned long ea) +{ + /* We only prefault standard pages for now */ + if (unlikely(get_slice_psize(mm, ea) != mm->context.user_psize)) + return false; + + return true; +} +#else +static bool should_hash_preload(struct mm_struct *mm, unsigned long ea) +{ + return true; +} +#endif + void hash_preload(struct mm_struct *mm, unsigned long ea, unsigned long access, unsigned long trap) {
@@ -1208,11 +1224,8 @@ void hash_preload(struct mm_struct *mm, BUG_ON(REGION_ID(ea) != USER_REGION_ID); -#ifdef CONFIG_PPC_MM_SLICES - /* We only prefault standard pages for now */ - if (unlikely(get_slice_psize(mm, ea) != mm->context.user_psize)) + if (!should_hash_preload(mm, ea)) return; -#endif DBG_LOW("hash_preload(mm=%p, mm->pgdir=%p, ea=%016lx, access=%lx," " trap=%lx\n", mm, mm->pgd, ea, access, trap);