Subject: + x86-mm-factor-out-of-top-down-direct-mapping-setup.patch added to -mm tree
To: tangchen@xxxxxxxxxxxxxx,hannes@xxxxxxxxxxx,hpa@xxxxxxxxx,isimatu.yasuaki@xxxxxxxxxxxxxx,izumi.taku@xxxxxxxxxxxxxx,jiang.liu@xxxxxxxxxx,kamezawa.hiroyu@xxxxxxxxxxxxxx,laijs@xxxxxxxxxxxxxx,liwanp@xxxxxxxxxxxxxxxxxx,mgorman@xxxxxxx,mina86@xxxxxxxxxx,minchan@xxxxxxxxxx,mingo@xxxxxxx,riel@xxxxxxxxxx,tglx@xxxxxxxxxxxxx,tj@xxxxxxxxxx,toshi.kani@xxxxxx,trenn@xxxxxxx,wency@xxxxxxxxxxxxxx,yinghai@xxxxxxxxxx,zhangyanfei@xxxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Fri, 11 Oct 2013 13:39:10 -0700
The patch titled
Subject: x86/mm: factor out of top-down direct mapping setup
has been added to the -mm tree. Its filename is
x86-mm-factor-out-of-top-down-direct-mapping-setup.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/x86-mm-factor-out-of-top-down-direct-mapping-setup.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/x86-mm-factor-out-of-top-down-direct-mapping-setup.patch
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------------------------------------------------------
From: Tang Chen <tangchen@xxxxxxxxxxxxxx>
Subject: x86/mm: factor out of top-down direct mapping setup
Create a new function memory_map_top_down to factor out of the top-down
direct memory mapping pagetable setup. This is also a preparation for the
following patch, which will introduce the bottom-up memory mapping. That
said, we will put the two ways of pagetable setup into separate functions,
and choose to use which way in init_mem_mapping, which makes the code more
clear.
Signed-off-by: Tang Chen <tangchen@xxxxxxxxxxxxxx>
Signed-off-by: Zhang Yanfei <zhangyanfei@xxxxxxxxxxxxxx>
Acked-by: Tejun Heo <tj@xxxxxxxxxx>
Acked-by: Toshi Kani <toshi.kani@xxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx>
Cc: Thomas Renninger <trenn@xxxxxxx>
Cc: Yinghai Lu <yinghai@xxxxxxxxxx>
Cc: Jiang Liu <jiang.liu@xxxxxxxxxx>
Cc: Wen Congyang <wency@xxxxxxxxxxxxxx>
Cc: Lai Jiangshan <laijs@xxxxxxxxxxxxxx>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx>
Cc: Taku Izumi <izumi.taku@xxxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Michal Nazarewicz <mina86@xxxxxxxxxx
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/mm/init.c | 60 ++++++++++++++++++++++++++++---------------
1 file changed, 40 insertions(+), 20 deletions(-)
diff -puN arch/x86/mm/init.c~x86-mm-factor-out-of-top-down-direct-mapping-setup arch/x86/mm/init.c
--- a/arch/x86/mm/init.c~x86-mm-factor-out-of-top-down-direct-mapping-setup
+++ a/arch/x86/mm/init.c
@@ -401,27 +401,28 @@ static unsigned long __init init_range_m
/* (PUD_SHIFT-PMD_SHIFT)/2 */
#define STEP_SIZE_SHIFT 5
-void __init init_mem_mapping(void)
+
+/**
+ * memory_map_top_down - Map [map_start, map_end) top down
+ * @map_start: start address of the target memory range
+ * @map_end: end address of the target memory range
+ *
+ * This function will setup direct mapping for memory range
+ * [map_start, map_end) in top-down. That said, the page tables
+ * will be allocated at the end of the memory, and we map the
+ * memory in top-down.
+ */
+static void __init memory_map_top_down(unsigned long map_start,
+ unsigned long map_end)
{
- unsigned long end, real_end, start, last_start;
+ unsigned long real_end, start, last_start;
unsigned long step_size;
unsigned long addr;
unsigned long mapped_ram_size = 0;
unsigned long new_mapped_ram_size;
- probe_page_size_mask();
-
-#ifdef CONFIG_X86_64
- end = max_pfn << PAGE_SHIFT;
-#else
- end = max_low_pfn << PAGE_SHIFT;
-#endif
-
- /* the ISA range is always mapped regardless of memory holes */
- init_memory_mapping(0, ISA_END_ADDRESS);
-
/* xen has big range in reserved near end of ram, skip it at first.*/
- addr = memblock_find_in_range(ISA_END_ADDRESS, end, PMD_SIZE, PMD_SIZE);
+ addr = memblock_find_in_range(map_start, map_end, PMD_SIZE, PMD_SIZE);
real_end = addr + PMD_SIZE;
/* step_size need to be small so pgt_buf from BRK could cover it */
@@ -436,13 +437,13 @@ void __init init_mem_mapping(void)
* end of RAM in [min_pfn_mapped, max_pfn_mapped) used as new pages
* for page table.
*/
- while (last_start > ISA_END_ADDRESS) {
+ while (last_start > map_start) {
if (last_start > step_size) {
start = round_down(last_start - 1, step_size);
- if (start < ISA_END_ADDRESS)
- start = ISA_END_ADDRESS;
+ if (start < map_start)
+ start = map_start;
} else
- start = ISA_END_ADDRESS;
+ start = map_start;
new_mapped_ram_size = init_range_memory_mapping(start,
last_start);
last_start = start;
@@ -453,8 +454,27 @@ void __init init_mem_mapping(void)
mapped_ram_size += new_mapped_ram_size;
}
- if (real_end < end)
- init_range_memory_mapping(real_end, end);
+ if (real_end < map_end)
+ init_range_memory_mapping(real_end, map_end);
+}
+
+void __init init_mem_mapping(void)
+{
+ unsigned long end;
+
+ probe_page_size_mask();
+
+#ifdef CONFIG_X86_64
+ end = max_pfn << PAGE_SHIFT;
+#else
+ end = max_low_pfn << PAGE_SHIFT;
+#endif
+
+ /* the ISA range is always mapped regardless of memory holes */
+ init_memory_mapping(0, ISA_END_ADDRESS);
+
+ /* setup direct mapping for range [ISA_END_ADDRESS, end) in top-down*/
+ memory_map_top_down(ISA_END_ADDRESS, end);
#ifdef CONFIG_X86_64
if (max_pfn > max_low_pfn) {
_
Patches currently in -mm which might be from tangchen@xxxxxxxxxxxxxx are
mm-sparsemem-use-pages_per_section-to-remove-redundant-nr_pages-parameter.patch
mm-sparsemem-fix-a-bug-in-free_map_bootmem-when-config_sparsemem_vmemmap.patch
mm-sparsemem-fix-a-bug-in-free_map_bootmem-when-config_sparsemem_vmemmap-v2.patch
memblock-factor-out-of-top-down-allocation.patch
memblock-introduce-bottom-up-allocation-mode.patch
x86-mm-factor-out-of-top-down-direct-mapping-setup.patch
x86-mem-hotplug-support-initialize-page-tables-in-bottom-up.patch
x86-acpi-crash-kdump-do-reserve_crashkernel-after-srat-is-parsed.patch
mem-hotplug-introduce-movable_node-boot-option.patch
linux-next.patch
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