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 <[email protected]> --- 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
