linux-kernel - [PATCH 08/17] x86: unify kernel_physical_mapping_init() call in init_memory

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Message-Id: <1236257708-27269-8-git-send-email-penberg@cs.helsinki.fi>
Date:	Thu,  5 Mar 2009 14:54:59 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	mingo@...e.hu
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH 08/17] x86: unify kernel_physical_mapping_init() call in init_memory_mapping()

Impact: cleanup

The 64-bit version of init_memory_mapping() uses the last mapped address
returned from kernel_physical_mapping_init() whereas the 32-bit version
doesn't. This patch adds relevant ifdefs to both versions of the function to
reduce the diff between them.

Cc: Yinghai Lu <yinghai@...nel.org>
Signed-off-by: Pekka Enberg <penberg@...helsinki.fi>
---
 arch/x86/mm/init_32.c |   10 +++++++++-
 arch/x86/mm/init_64.c |   21 +++++++++++++--------
 2 files changed, 22 insertions(+), 9 deletions(-)

diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index cc5c399..00c1d85 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -929,6 +929,7 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
 	unsigned long page_size_mask = 0;
 	unsigned long start_pfn, end_pfn;
 	unsigned long pos;
+	unsigned long ret;
 
 	struct map_range mr[NR_RANGE_MR];
 	int nr_range, i;
@@ -1040,11 +1041,18 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
 	if (!after_bootmem)
 		find_early_table_space(end, use_pse, use_gbpages);
 
+#ifdef CONFIG_X86_32
 	for (i = 0; i < nr_range; i++)
 		kernel_physical_mapping_init(
 				mr[i].start >> PAGE_SHIFT,
 				mr[i].end >> PAGE_SHIFT,
 				mr[i].page_size_mask == (1<<PG_LEVEL_2M));
+	ret = end;
+#else /* CONFIG_X86_64 */
+	for (i = 0; i < nr_range; i++)
+		ret = kernel_physical_mapping_init(mr[i].start, mr[i].end,
+						   mr[i].page_size_mask);
+#endif
 
 	early_ioremap_page_table_range_init();
 
@@ -1059,7 +1067,7 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
 	if (!after_bootmem)
 		early_memtest(start, end);
 
-	return end >> PAGE_SHIFT;
+	return ret >> PAGE_SHIFT;
 }
 
 
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index c3c0be5..e4fadea 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -686,10 +686,10 @@ static int save_mr(struct map_range *mr, int nr_range,
 unsigned long __init_refok init_memory_mapping(unsigned long start,
 					       unsigned long end)
 {
-	unsigned long last_map_addr = 0;
 	unsigned long page_size_mask = 0;
 	unsigned long start_pfn, end_pfn;
 	unsigned long pos;
+	unsigned long ret;
 
 	struct map_range mr[NR_RANGE_MR];
 	int nr_range, i;
@@ -819,10 +819,18 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
 	if (!after_bootmem)
 		find_early_table_space(end, use_pse, use_gbpages);
 
+#ifdef CONFIG_X86_32
+	for (i = 0; i < nr_range; i++)
+		kernel_physical_mapping_init(
+				mr[i].start >> PAGE_SHIFT,
+				mr[i].end >> PAGE_SHIFT,
+				mr[i].page_size_mask == (1<<PG_LEVEL_2M));
+	ret = end;
+#else /* CONFIG_X86_64 */
 	for (i = 0; i < nr_range; i++)
-		last_map_addr = kernel_physical_mapping_init(
-					mr[i].start, mr[i].end,
-					mr[i].page_size_mask);
+		ret = kernel_physical_mapping_init(mr[i].start, mr[i].end,
+						   mr[i].page_size_mask);
+#endif
 
 	if (!after_bootmem)
 		mmu_cr4_features = read_cr4();
@@ -832,13 +840,10 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
 		reserve_early(table_start << PAGE_SHIFT,
 				 table_end << PAGE_SHIFT, "PGTABLE");
 
-	printk(KERN_INFO "last_map_addr: %lx end: %lx\n",
-			 last_map_addr, end);
-
 	if (!after_bootmem)
 		early_memtest(start, end);
 
-	return last_map_addr >> PAGE_SHIFT;
+	return ret >> PAGE_SHIFT;
 }
 
 #ifndef CONFIG_NUMA
-- 
1.5.4.3

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