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memory-hotplug: create /sys/firmware/memmap entry for new memory

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A memmap is a directory in sysfs which includes 3 text files: start, end
and type.  For example:

start: 	0x100000
end:	0x7e7b1cff
type:	System RAM

Interface firmware_map_add was not called explicitly.  Remove it and add
function firmware_map_add_hotplug as hotplug interface of memmap.

Each memory entry has a memmap in sysfs, When we hot-add new memory, sysfs
does not export memmap entry for it.  We add a call in function add_memory
to function firmware_map_add_hotplug.

Add a new function add_sysfs_fw_map_entry() to create memmap entry, it
will be called when initialize memmap and hot-add memory.

[[email protected]: un-kernedoc a no longer kerneldoc comment]
Signed-off-by: Shaohui Zheng <[email protected]>
Acked-by: Andi Kleen <[email protected]>
Acked-by: Yasunori Goto <[email protected]>
Reviewed-by: Wu Fengguang <[email protected]>
Cc: Dave Hansen <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
[email protected] 2010-03-05 13:41:58 -08:00 • committed by Linus Torvalds
commit d96ae53091
3 changed files with 43 additions and 24 deletions
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4
mm/memory_hotplug.c
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@ -28,6 +28,7 @@
#include <linux/pfn.h>
#include <linux/suspend.h>
#include <linux/mm_inline.h>
#include <linux/firmware-map.h>
#include <asm/tlbflush.h>
@ -523,6 +524,9 @@ int __ref add_memory(int nid, u64 start, u64 size)
BUG_ON(ret);
}
/* create new memmap entry */
firmware_map_add_hotplug(start, start + size, "System RAM");
goto out;
error: