Re: SLUB: Return ZERO_SIZE_PTR for kmalloc(0)
From: Pekka Enberg
Date: Mon Jun 04 2007 - 18:30:59 EST
Christoph Lameter wrote:
That is another patchset. See
http://marc.info/?l=linux-kernel&w=2&r=1&s=DEVELKERNEL&q=b
Oh my, I am totally confused now.
First you fix kmalloc(0) to be legal and safe. And then you want to
DEVEL_WARN_ON_ONCE when size is zero so people can fix their code?
I don't get it.
I thought we wanted to support kmalloc(0) so that as long as you don't
dereference the pointer, it's all legal and good. Right? So we obviously
should shut up the WARN_ON because if you do oops, you can clearly see
that it happened at ZERO_SIZE_PTR and have a nice stack trace anyway...
Btw, if I am again missing something totally obvious, could you please
be so kind to send me a batch of the same pills that the smart people
take. I am all out.
Pekka
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