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authorAndrea Arcangeli <aarcange@redhat.com>2011-01-13 15:46:40 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2011-01-13 17:32:40 -0800
commit5f6e8da70a289d403975907371ce5738c726ad3f (patch)
treec44705a17d4133a8d4a8d02dae9bb5487c3bc2a6 /include
parent4c76d9d1fb9b21fa10c9e4c1fab2875018a88aa1 (diff)
thp: special pmd_trans_* functions
These returns 0 at compile time when the config option is disabled, to allow gcc to eliminate the transparent hugepage function calls at compile time without additional #ifdefs (only the export of those functions have to be visible to gcc but they won't be required at link time and huge_memory.o can be not built at all). _PAGE_BIT_UNUSED1 is never used for pmd, only on pte. Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Acked-by: Rik van Riel <riel@redhat.com> Acked-by: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/asm-generic/pgtable.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index 6f3c6ae4fe0..0ab2cd27c60 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -348,6 +348,17 @@ extern void untrack_pfn_vma(struct vm_area_struct *vma, unsigned long pfn,
unsigned long size);
#endif
+#ifndef CONFIG_TRANSPARENT_HUGEPAGE
+static inline int pmd_trans_huge(pmd_t pmd)
+{
+ return 0;
+}
+static inline int pmd_trans_splitting(pmd_t pmd)
+{
+ return 0;
+}
+#endif
+
#endif /* !__ASSEMBLY__ */
#endif /* _ASM_GENERIC_PGTABLE_H */