[RFC PATCH 26/34] x86: mm: define pudp_set_access_flags() when CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD is enabled only.

[Yeoreum Yun]

We want to rework how set_pXd() behaves for generic compile-time folded
page tables by disallowing its use and triggering a compile-time error
when it is used improperly, ensuring that the actual first-level
set_pXd() function is used instead.

For this, define pudp_set_access_flags() when
CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD is enabled only.

Signed-off-by: Yeoreum Yun <yeoreum.yun at arm.com>
---
 arch/x86/mm/pgtable.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index e4bf6a1d63618..a263625cdcd6b 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -418,6 +418,7 @@ int pmdp_set_access_flags(struct vm_area_struct *vma,
 	return changed;
 }
 
+#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
 int pudp_set_access_flags(struct vm_area_struct *vma, unsigned long address,
 			  pud_t *pudp, pud_t entry, int dirty)
 {
@@ -437,6 +438,7 @@ int pudp_set_access_flags(struct vm_area_struct *vma, unsigned long address,
 
 	return changed;
 }
+#endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
 #endif
 
 bool ptep_test_and_clear_young(struct vm_area_struct *vma,
-- 
LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}