Setting kernelcore_max_pfn means all memory which is bigger than
the boot parameter is allocated as ZONE_MOVABLE. So memory which
is allocated by memblock also should be limited by the parameter.
The patch limits memory from memblock.
---
include/linux/memblock.h | 1 +
mm/memblock.c | 5 ++++-
mm/page_alloc.c | 6 +++++-
3 files changed, 10 insertions(+), 2 deletions(-)
Index: linux-3.4-rc6/include/linux/memblock.h
===================================================================
--- linux-3.4-rc6.orig/include/linux/memblock.h 2012-05-15 03:17:33.180555589 +0900
+++ linux-3.4-rc6/include/linux/memblock.h 2012-05-15 03:51:25.102153084 +0900
@@ -42,6 +42,7 @@ struct memblock {
extern struct memblock memblock;
extern int memblock_debug;
+extern phys_addr_t memblock_limit;
#define memblock_dbg(fmt, ...) \
if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
Index: linux-3.4-rc6/mm/memblock.c
===================================================================
--- linux-3.4-rc6.orig/mm/memblock.c 2012-05-15 03:17:33.180555589 +0900
+++ linux-3.4-rc6/mm/memblock.c 2012-05-15 03:51:25.104153055 +0900
@@ -876,7 +876,10 @@ int __init_memblock memblock_is_region_r
void __init_memblock memblock_set_current_limit(phys_addr_t limit)
{
- memblock.current_limit = limit;
+ if (!memblock_limit || (memblock_limit > limit))
+ memblock.current_limit = limit;
+ else
+ memblock.current_limit = memblock_limit;
}
static void __init_memblock memblock_dump(struct memblock_type *type, char *name)
Index: linux-3.4-rc6/mm/page_alloc.c
===================================================================
--- linux-3.4-rc6.orig/mm/page_alloc.c 2012-05-15 03:17:33.179555602 +0900
+++ linux-3.4-rc6/mm/page_alloc.c 2012-05-15 03:51:25.107153013 +0900
@@ -205,6 +205,8 @@ static unsigned long __initdata required
static unsigned long __initdata required_movablecore;
static unsigned long __meminitdata zone_movable_pfn[MAX_NUMNODES];
+phys_addr_t memblock_limit;
+
/* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */
int movable_zone;
EXPORT_SYMBOL(movable_zone);
@@ -4836,7 +4838,9 @@ static int __init cmdline_parse_core(cha
*/
static int __init cmdline_parse_kernelcore_max_addr(char *p)
{
- return cmdline_parse_core(p, &required_kernelcore_max_pfn);
+ cmdline_parse_core(p, &required_kernelcore_max_pfn);
+ memblock_limit = required_kernelcore_max_pfn << PAGE_SHIFT;
+ return 0;
}
/*
--
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