[PATCH 09/10] x86, mm: Hide pgt_buf_* into internal to xen

[Yinghai Lu]

only should be used by init.c and init_64.c and init_32.c

Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
---
 arch/x86/include/asm/init.h |    2 ++
 arch/x86/mm/init.c          |    5 +++++
 arch/x86/xen/mmu.c          |    2 +-
 3 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/arch/x86/include/asm/init.h b/arch/x86/include/asm/init.h
index 4f13998..b69e537 100644
--- a/arch/x86/include/asm/init.h
+++ b/arch/x86/include/asm/init.h
@@ -16,4 +16,6 @@ extern unsigned long __initdata pgt_buf_start;
 extern unsigned long __meminitdata pgt_buf_end;
 extern unsigned long __meminitdata pgt_buf_top;
 
+bool is_pfn_in_early_pgt_buf(unsigned long pfn);
+
 #endif /* _ASM_X86_INIT_32_H */
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index 6622d35..1becfbd 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -21,6 +21,11 @@ unsigned long __initdata pgt_buf_start;
 unsigned long __meminitdata pgt_buf_end;
 unsigned long __meminitdata pgt_buf_top;
 
+bool __init is_pfn_in_early_pgt_buf(unsigned long pfn)
+{
+	return pfn >= pgt_buf_start && pfn < pgt_buf_top;
+}
+
 int after_bootmem;
 
 int direct_gbpages
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 7607a33..25f68bc 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -1410,7 +1410,7 @@ static pte_t __init mask_rw_pte(pte_t *ptep, pte_t pte)
 	 * If the new pfn is within the range of the newly allocated
 	 * kernel pagetable, make sure it is RO.
 	 */
-	if (pfn >= pgt_buf_start && pfn < pgt_buf_top)
+	if (is_pfn_in_early_pgt_buf(pfn))
 		pte = pte_wrprotect(pte);
 
 	return pte;
-- 
1.7.7

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