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

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Date:	Thu, 12 Jul 2012 13:52:38 +0900
From:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
CC:	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
	<linuxppc-dev@...ts.ozlabs.org>, <linux-acpi@...r.kernel.org>,
	<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: Re: [RFC PATCH v3 3/13] memory-hotplug : unify argument of firmware_map_add_early/hotplug

Hi Dave,

2012/07/12 0:30, Dave Hansen wrote:
> On 07/09/2012 03:25 AM, Yasuaki Ishimatsu wrote:
>> @@ -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");
> 
> I know the firmware_map_*() calls use inclusive end addresses
> internally, but do we really need to expose them?  Both of the callers
> you mentioned do:
> 
> 	firmware_map_add_hotplug(start, start + size - 1, "System RAM");
> 
> or
> 
>                  firmware_map_add_early(entry->addr,
>                          entry->addr + entry->size - 1,
>                          e820_type_to_string(entry->type));
> 
> So it seems a _bit_ silly to keep all of the callers doing this size-1
> thing.  I also noted that the new caller that you added does the same
> thing.  Could we just change the external calling convention to be
> exclusive?

Thank you for your comment.

Does the following patch include your comment? If O.K., I will separate
the patch from the series and send it for bug fix.

---
 arch/x86/kernel/e820.c    |    2 +-
 drivers/firmware/memmap.c |    8 ++++----
 2 files changed, 5 insertions(+), 5 deletions(-)

Index: linux-next/arch/x86/kernel/e820.c
===================================================================
--- linux-next.orig/arch/x86/kernel/e820.c	2012-07-02 09:50:23.000000000 +0900
+++ linux-next/arch/x86/kernel/e820.c	2012-07-12 13:30:45.942318179 +0900
@@ -944,7 +944,7 @@
 	for (i = 0; i < e820_saved.nr_map; i++) {
 		struct e820entry *entry = &e820_saved.map[i];
 		firmware_map_add_early(entry->addr,
-			entry->addr + entry->size - 1,
+			entry->addr + entry->size,
 			e820_type_to_string(entry->type));
 	}
 }
Index: linux-next/drivers/firmware/memmap.c
===================================================================
--- linux-next.orig/drivers/firmware/memmap.c	2012-07-02 09:50:26.000000000 +0900
+++ linux-next/drivers/firmware/memmap.c	2012-07-12 13:40:53.823318481 +0900
@@ -98,7 +98,7 @@
 /**
  * firmware_map_add_entry() - Does the real work to add a firmware memmap entry.
  * @start: Start of the memory range.
- * @end:   End of the memory range (inclusive).
+ * @end:   End of the memory range.
  * @type:  Type of the memory range.
  * @entry: Pre-allocated (either kmalloc() or bootmem allocator), uninitialised
  *         entry.
@@ -113,7 +113,7 @@
 	BUG_ON(start > end);

 	entry->start = start;
-	entry->end = end;
+	entry->end = end - 1;
 	entry->type = type;
 	INIT_LIST_HEAD(&entry->list);
 	kobject_init(&entry->kobj, &memmap_ktype);
@@ -148,7 +148,7 @@
  * firmware_map_add_hotplug() - Adds a firmware mapping entry when we do
  * memory hotplug.
  * @start: Start of the memory range.
- * @end:   End of the memory range (inclusive).
+ * @end:   End of the memory range.
  * @type:  Type of the memory range.
  *
  * Adds a firmware mapping entry. This function is for memory hotplug, it is
@@ -175,7 +175,7 @@
 /**
  * firmware_map_add_early() - Adds a firmware mapping entry.
  * @start: Start of the memory range.
- * @end:   End of the memory range (inclusive).
+ * @end:   End of the memory range.
  * @type:  Type of the memory range.
  *
  * Adds a firmware mapping entry. This function uses the bootmem allocator

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