There are two ways to create /sys/firmware/memmap/X sysfs:
- firmware_map_add_early
When the system starts, it is calledd from e820_reserve_resources()
- firmware_map_add_hotplug
When the memory is hot plugged, it is called from add_memory()
But these functions are called without unifying value of end argument as below:
- end argument of firmware_map_add_early() : start + size - 1
- end argument of firmware_map_add_hogplug() : start + size
The patch unifies them to "start + size - 1".
CC: David Rientjes <rient...@google.com>
CC: Jiang Liu <liu...@gmail.com>
CC: Len Brown <len.br...@intel.com>
CC: Benjamin Herrenschmidt <b...@kernel.crashing.org>
CC: Paul Mackerras <pau...@samba.org>
CC: Christoph Lameter <c...@linux.com>
Cc: Minchan Kim <minchan....@gmail.com>
CC: Andrew Morton <a...@linux-foundation.org>
CC: KOSAKI Motohiro <kosaki.motoh...@jp.fujitsu.com>
CC: Wen Congyang <we...@cn.fujitsu.com>
Signed-off-by: Yasuaki Ishimatsu <isimatu.yasu...@jp.fujitsu.com>
---
mm/memory_hotplug.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Index: linux-3.5-rc6/mm/memory_hotplug.c
===================================================================
--- linux-3.5-rc6.orig/mm/memory_hotplug.c 2012-07-09 18:08:43.476719455
+0900
+++ linux-3.5-rc6/mm/memory_hotplug.c 2012-07-09 18:13:57.664791810 +0900
@@ -642,7 +642,7 @@ int __ref add_memory(int nid, u64 start,
}
/* create new memmap entry */
- firmware_map_add_hotplug(start, start + size, "System RAM");
+ firmware_map_add_hotplug(start, start + size - 1, "System RAM");
goto out;
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