linux-kernel - [PATCH 2/3] x86,mm: Introduce init_memory_mapping

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Date:	Fri, 25 Feb 2011 19:07:06 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Tejun Heo <tj@...nel.org>, Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] x86,mm: Introduce init_memory_mapping_ext()


Add extra input tbl_end. it could be smaller than end.

Prepare for init_memory_mapping_high() to align boundary to 1G.
aka end could round up to 1g bound, and will be bigger then original
node end.

init_memory_mapping will call init_memory_mapping_ext with tbl=end.

-v2: updated after page_size_mask change

Signed-off-by: Yinghai Lu <yinghai@...nel.org>

---
 arch/x86/include/asm/page_types.h |    7 +++++--
 arch/x86/mm/init.c                |   21 ++++++++++++++-------
 2 files changed, 19 insertions(+), 9 deletions(-)

Index: linux-2.6/arch/x86/include/asm/page_types.h
===================================================================
--- linux-2.6.orig/arch/x86/include/asm/page_types.h
+++ linux-2.6/arch/x86/include/asm/page_types.h
@@ -51,8 +51,11 @@ static inline phys_addr_t get_max_mapped
 	return (phys_addr_t)max_pfn_mapped << PAGE_SHIFT;
 }
 
-extern unsigned long init_memory_mapping(unsigned long start,
-					 unsigned long end);
+unsigned long init_memory_mapping_ext(unsigned long start,
+				      unsigned long end,
+				      unsigned long tbl_end);
+
+unsigned long init_memory_mapping(unsigned long start, unsigned long end);
 
 void init_memory_mapping_high(void);
 
Index: linux-2.6/arch/x86/mm/init.c
===================================================================
--- linux-2.6.orig/arch/x86/mm/init.c
+++ linux-2.6/arch/x86/mm/init.c
@@ -32,9 +32,10 @@ int direct_gbpages
 
 int page_size_mask = -1;
 
-static void __init find_early_table_space(unsigned long end)
+static void __init find_early_table_space(unsigned long end,
+					  unsigned long tbl_end)
 {
-	unsigned long puds, pmds, ptes, tables, start = 0, good_end = end;
+	unsigned long puds, pmds, ptes, tables, start = 0;
 	phys_addr_t base;
 
 	puds = (end + PUD_SIZE - 1) >> PUD_SHIFT;
@@ -67,10 +68,10 @@ static void __init find_early_table_spac
 	/* for fixmap */
 	tables += roundup(__end_of_fixed_addresses * sizeof(pte_t), PAGE_SIZE);
 
-	good_end = max_pfn_mapped << PAGE_SHIFT;
+	tbl_end = max_pfn_mapped << PAGE_SHIFT;
 #endif
 
-	base = memblock_find_in_range(start, good_end, tables, PAGE_SIZE);
+	base = memblock_find_in_range(start, tbl_end, tables, PAGE_SIZE);
 	if (base == MEMBLOCK_ERROR)
 		panic("Cannot find space for the kernel page tables");
 
@@ -144,8 +145,9 @@ static int __meminit save_mr(struct map_
  * This runs before bootmem is initialized and gets pages directly from
  * the physical memory. To access them they are temporarily mapped.
  */
-unsigned long __init_refok init_memory_mapping(unsigned long start,
-					       unsigned long end)
+unsigned long __init_refok init_memory_mapping_ext(unsigned long start,
+					       unsigned long end,
+					       unsigned long tbl_end)
 {
 	unsigned long start_pfn, end_pfn;
 	unsigned long ret = 0;
@@ -260,7 +262,7 @@ unsigned long __init_refok init_memory_m
 	 * nodes are discovered.
 	 */
 	if (!after_bootmem)
-		find_early_table_space(end);
+		find_early_table_space(end, tbl_end);
 
 	for (i = 0; i < nr_range; i++)
 		ret = kernel_physical_mapping_init(mr[i].start, mr[i].end,
@@ -284,6 +286,11 @@ unsigned long __init_refok init_memory_m
 	return ret >> PAGE_SHIFT;
 }
 
+unsigned long __init_refok init_memory_mapping(unsigned long start,
+					       unsigned long end)
+{
+	return init_memory_mapping_ext(start, end, end);
+}
 
 /*
  * devmem_is_allowed() checks to see if /dev/mem access to a certain address
--
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