linux-kernel - Re: [PATCH] firmware_map : unify argument of firmware_map_add

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Date:	Tue, 24 Jul 2012 13:59:13 +0900
From:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To:	<linux-kernel@...r.kernel.org>
CC:	<tglx@...utronix.de>, <mingo@...nel.org>, <hpa@...or.com>,
	<tj@...nel.org>, <akpm@...ux-foundation.org>,
	<dave@...ux.vnet.ibm.com>
Subject: Re: [PATCH] firmware_map : unify argument of firmware_map_add_early/hotplug

The patch is bugfix. So I want you to review it and merge into linux-3.6.

2012/07/17 11:17, Yasuaki Ishimatsu wrote:
> 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". Even if applying the patch,
> /sys/firmware/memmap/X/end file content does not change.
> 
> CC: Thomas Gleixner <tglx@...utronix.de>
> CC: Ingo Molnar <mingo@...nel.org>
> CC: H. Peter Anvin <hpa@...or.com>
> CC: Tejun Heo <tj@...nel.org>
> CC: Andrew Morton <akpm@...ux-foundation.org>
> Reviewed-by: Dave Hansen <dave@...ux.vnet.ibm.com>
> Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
> 
> ---
>   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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