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kmalloc question

I have a question about how to determine if something has been kmalloced
or not.  I thought this was the case:

char *temp;

if(!temp)
	/* temp has not been kmalloced yet */
else
	/* temp has been kmalloced */

This doesnt seem to be the case for my kernel code.  Does anyone have any
ideas of how I can do this?  If more information would be useful, Ill post
more.  Thank you in advance!

Dan

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