[PATCH] x86: mm: accurate the comments for STEP_SIZE_SHIFT macro

[Lin Feng <linfeng@xxxxxxxxxxxxxx>]

For x86 PUD_SHIFT is 30 and PMD_SHIFT is 21, so the consequence of
(PUD_SHIFT-PMD_SHIFT)/2 is 4. Update the comments to the code.

Cc: Yinghai Lu <yinghai@xxxxxxxxxx>
Signed-off-by: Lin Feng <linfeng@xxxxxxxxxxxxxx>
---
 arch/x86/mm/init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index 59b7fc4..637a95b 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -389,7 +389,7 @@ static unsigned long __init init_range_memory_mapping(
 	return mapped_ram_size;
 }
 
-/* (PUD_SHIFT-PMD_SHIFT)/2 */
+/* (PUD_SHIFT-PMD_SHIFT)/2+1 */
 #define STEP_SIZE_SHIFT 5
 void __init init_mem_mapping(void)
 {
-- 
1.8.0.1

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