netdev - Re: Run-time kfree check for correct cache [was Re: [NET]: Fix kfree(skb)]

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Message-Id: <200702281110.54619.dada1@cosmosbay.com>
Date:	Wed, 28 Feb 2007 11:10:54 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	David Miller <davem@...emloft.net>, paul.moore@...com,
	kaber@...sh.net, netdev@...r.kernel.org, acme@...stprotocols.net
Subject: Re: Run-time kfree check for correct cache [was Re: [NET]: Fix kfree(skb)]

On Wednesday 28 February 2007 10:02, Evgeniy Polyakov wrote:
> Attached patch detects in run-time things like:
> skb = alloc_skb();
> kfree(skb);
>
> where provided to kfree pointer does not belong to kmalloc caches.
> It is turned on when slab debug config option is enabled.
>
> When problem is detected, following warning is printed with hint to
> what cache/function should be used instead:

It would be less expensive to add a flag 
#define SLAB_KFREE_NOWARNING 0x00200000UL

And OR this flags into cs->flags of all standard caches created by 
kmem_cache_init() from malloc_sizes[]/cache_names[]

kfree() would then just test this flag.

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