linux-kernel - Re: [Bug fix PATCH v5] Reusing a resource structure allocated by bootmem

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Message-ID: <1366751135.6660.3.camel@misato.fc.hp.com>
Date:	Tue, 23 Apr 2013 15:05:35 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
Cc:	hannes@...xchg.org, akpm@...ux-foundation.org, linuxram@...ibm.com,
	rientjes@...gle.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [Bug fix PATCH v5] Reusing a resource structure allocated by
 bootmem

On Tue, 2013-04-23 at 10:37 +0900, Yasuaki Ishimatsu wrote:
 :
> The reason why the messages are shown is to release a resource structure,
> allocated by bootmem, by kfree(). So when we release a resource structure,
> we should check whether it is allocated by bootmem or not.
> 
> But even if we know a resource structure is allocated by bootmem, we cannot
> release it since SLxB cannot treat it. So for reusing a resource structure,
> this patch remembers it by using bootmem_resource as follows:
> 
> When releasing a resource structure by free_resource(), free_resource() checks
> whether the resource structure is allocated by bootmem or not. If it is
> allocated by bootmem, free_resource() adds it to bootmem_resource. If it is
> not allocated by bootmem, free_resource() release it by kfree().
> 
> And when getting a new resource structure by get_resource(), get_resource()
> checks whether bootmem_resource has released resource structures or not. If
> there is a released resource structure, get_resource() returns it. If there is
> not a releaed resource structure, get_resource() returns new resource structure
> allocated by kzalloc().
> ---
> v5:
> Define bootmem_resource_free as static and poiner for saving memory
> Fix slab check in free_resource()
> Move memset outside of spin lock in get_resource()

Please add your "Signed-off-by".  Otherwise the changes look good.

Reviewed-by: Toshi Kani <toshi.kani@...com>

Thanks,
-Toshi



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