[PATCH V2 1/2] x86: add arch_pfn_possible helper

[Frantisek Hrbata <fhrbata@redhat.com>]

Add helper to check maximum possible pfn on x86. Also make the current
phys_addr_valid helper using it internally.

Signed-off-by: Frantisek Hrbata <fhrbata@redhat.com>
---
 arch/x86/mm/physaddr.h | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/arch/x86/mm/physaddr.h b/arch/x86/mm/physaddr.h
index a3cd5a0..9df8e3a 100644
--- a/arch/x86/mm/physaddr.h
+++ b/arch/x86/mm/physaddr.h
@@ -1,10 +1,15 @@
 #include <asm/processor.h>
 
-static inline int phys_addr_valid(resource_size_t addr)
+static inline int arch_pfn_possible(unsigned long pfn)
 {
 #ifdef CONFIG_PHYS_ADDR_T_64BIT
-	return !(addr >> boot_cpu_data.x86_phys_bits);
+	return !(pfn >> (boot_cpu_data.x86_phys_bits - PAGE_SHIFT));
 #else
 	return 1;
 #endif
 }
+
+static inline int phys_addr_valid(resource_size_t addr)
+{
+	return arch_pfn_possible(addr >> PAGE_SHIFT);
+}
-- 
1.9.3

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