[tip:x86/mm2] x86, mm: use pfn_range_is_mapped() with CPA

[tip-bot for Yinghai Lu]

Commit-ID:  8eb5779f6b9c7e390c92f451edaafc039e06e743
Gitweb:     http://git.kernel.org/tip/8eb5779f6b9c7e390c92f451edaafc039e06e743
Author:     Yinghai Lu <yinghai@xxxxxxxxxx>
AuthorDate: Fri, 16 Nov 2012 19:38:49 -0800
Committer:  H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
CommitDate: Sat, 17 Nov 2012 11:59:09 -0800

x86, mm: use pfn_range_is_mapped() with CPA

We are going to map ram only, so under max_low_pfn_mapped,
between 4g and max_pfn_mapped does not mean mapped at all.

Use pfn_range_is_mapped() directly.

Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/1353123563-3103-13-git-send-email-yinghai@xxxxxxxxxx
Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
---
 arch/x86/mm/pageattr.c | 16 +++-------------
 1 file changed, 3 insertions(+), 13 deletions(-)

diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index a718e0d..44acfcd 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -551,16 +551,10 @@ static int split_large_page(pte_t *kpte, unsigned long address)
 	for (i = 0; i < PTRS_PER_PTE; i++, pfn += pfninc)
 		set_pte(&pbase[i], pfn_pte(pfn, ref_prot));
 
-	if (address >= (unsigned long)__va(0) &&
-		address < (unsigned long)__va(max_low_pfn_mapped << PAGE_SHIFT))
+	if (pfn_range_is_mapped(PFN_DOWN(__pa(address)),
+				PFN_DOWN(__pa(address)) + 1))
 		split_page_count(level);
 
-#ifdef CONFIG_X86_64
-	if (address >= (unsigned long)__va(1UL<<32) &&
-		address < (unsigned long)__va(max_pfn_mapped << PAGE_SHIFT))
-		split_page_count(level);
-#endif
-
 	/*
 	 * Install the new, split up pagetable.
 	 *
@@ -729,13 +723,9 @@ static int cpa_process_alias(struct cpa_data *cpa)
 	unsigned long vaddr;
 	int ret;
 
-	if (cpa->pfn >= max_pfn_mapped)
+	if (!pfn_range_is_mapped(cpa->pfn, cpa->pfn + 1))
 		return 0;
 
-#ifdef CONFIG_X86_64
-	if (cpa->pfn >= max_low_pfn_mapped && cpa->pfn < (1UL<<(32-PAGE_SHIFT)))
-		return 0;
-#endif
 	/*
 	 * No need to redo, when the primary call touched the direct
 	 * mapping already:
--
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