Re: kfree(0) - ok?

[Arjan van de Ven]

On Tue, 2007-08-14 at 15:59 -0700, Tim Bird wrote:
> Hi all,
> 
> I have a quick question.
> 
> I'm trying to resurrect a patch from the Linux-tiny patch suite,
> to do accounting of kmalloc memory allocations.  In testing it
> with Linux 2.6.22, I've found a large number of kfrees of
> NULL pointers.
> 
> Is this considered OK?  Or should I examine the offenders
> to see if something is coded badly?

kfree(NULL) is explicitly ok and it saves code size to not check
anywhere
(the idea is that kfree(kmalloc(...)); is a guaranteed safe nop)

NULL is not 0 though.


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