[PATCH] use pfn_to_page in show_mem

[Wang Nan]

If a bank spans into different sections, the page structures of the bank
may not continous.

This patch uses pfn_to_page to recompute the address of struct page in show_mem
from pfn, makes it to collect correct information even if a bank spans into
different sections.

Signed-off-by: Wang Nan <wangnan0@xxxxxxxxxx>
---
 arch/arm/mm/init.c | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 1f7b19a..3078e5a 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -97,16 +97,14 @@ void show_mem(unsigned int filter)

 	for_each_bank (i, mi) {
 		struct membank *bank = &mi->bank[i];
-		unsigned int pfn1, pfn2;
-		struct page *page, *end;
+		unsigned int pfn, pfn_end;
+		struct page *page;

-		pfn1 = bank_pfn_start(bank);
-		pfn2 = bank_pfn_end(bank);
-
-		page = pfn_to_page(pfn1);
-		end  = pfn_to_page(pfn2 - 1) + 1;
+		pfn = bank_pfn_start(bank);
+		pfn_end = bank_pfn_end(bank);

 		do {
+			page = pfn_to_page(pfn);
 			total++;
 			if (PageReserved(page))
 				reserved++;
@@ -118,8 +116,8 @@ void show_mem(unsigned int filter)
 				free++;
 			else
 				shared += page_count(page) - 1;
-			page++;
-		} while (page < end);
+			pfn++;
+		} while (pfn < pfn_end);
 	}

 	printk("%d pages of RAM\n", total);
-- 
1.8.4





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