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 <[email protected]>
CC: Jiang Liu <[email protected]>
CC: Len Brown <[email protected]>
CC: Benjamin Herrenschmidt <[email protected]>
CC: Paul Mackerras <[email protected]>
CC: Christoph Lameter <[email protected]>
Cc: Minchan Kim <[email protected]>
CC: Andrew Morton <[email protected]>
CC: KOSAKI Motohiro <[email protected]>
CC: Wen Congyang <[email protected]>
Signed-off-by: Yasuaki Ishimatsu <[email protected]>
---
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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