Add a pmdp_huge_clear_flush() stub for configs that don't define
CONFIG_TRANSPARENT_HUGEPAGE.
We use a WARN_ON_ONCE() instead of a BUILD_BUG() because in the DAX code at
least we do want this compile successfully even for configs without
CONFIG_TRANSPARENT_HUGEPAGE. It'll be a runtime decision whether we call
this code gets called, based on whether we find DAX PMD entries in our
tree. We shouldn't ever find such PMD entries for
!CONFIG_TRANSPARENT_HUGEPAGE configs, so this function should never be
called.
Signed-off-by: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
---
include/asm-generic/pgtable.h | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index 18af2bc..65e9536 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -178,9 +178,19 @@ extern pte_t ptep_clear_flush(struct vm_area_struct *vma,
#endif
#ifndef __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
extern pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma,
unsigned long address,
pmd_t *pmdp);
+#else
+static inline pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma,
+ unsigned long address,
+ pmd_t *pmdp)
+{
+ WARN_ON_ONCE(1);
+ return *pmdp;
+}
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif
#ifndef __HAVE_ARCH_PTEP_SET_WRPROTECT
--
2.7.4
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