linux-kernel - [RFC PATCH v3 3/13] memory-hotplug : unify argument of firmware_map_add

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Message-ID: <4FFAB17F.2090209@jp.fujitsu.com>
Date:	Mon, 9 Jul 2012 19:25:03 +0900
From:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To:	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
	<linuxppc-dev@...ts.ozlabs.org>, <linux-acpi@...r.kernel.org>
CC:	<rientjes@...gle.com>, <liuj97@...il.com>, <len.brown@...el.com>,
	<benh@...nel.crashing.org>, <paulus@...ba.org>, <cl@...ux.com>,
	<minchan.kim@...il.com>, <akpm@...ux-foundation.org>,
	<kosaki.motohiro@...fujitsu.com>, <wency@...fujitsu.com>
Subject: [RFC PATCH v3 3/13] memory-hotplug : unify argument of firmware_map_add_early/hotplug

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 <rientjes@...gle.com>
CC: Jiang Liu <liuj97@...il.com>
CC: Len Brown <len.brown@...el.com>
CC: Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC: Paul Mackerras <paulus@...ba.org>
CC: Christoph Lameter <cl@...ux.com>
Cc: Minchan Kim <minchan.kim@...il.com>
CC: Andrew Morton <akpm@...ux-foundation.org>
CC: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
CC: Wen Congyang <wency@...fujitsu.com>
Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@...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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