> The vast majority of people never run with slab poisoning enabled
> judging by the number of bugs it constantly turns up.
>
Agreed, maybe we could insist that developers enable these options and
test their patch with debugging enabled before posting them, but I
have a feeling that it would meet a lot of resistance :-). Doesn't
hurt to document it in Documentation/HOWTO or somewhere more
appropriate.
> > kfree() will ignore NULL
> > pointer, from the comments in kfree
>
> *nod*, poisoning the ptr would be a better idea.
>
Yes, I think this is a better idea.
> > May we could have such a variant under CONFIG_DEBUG_SLAB if we needed
> > and also change the variant kfree to BUG_ON() a NULL pointer.
>
> given the cost is just a ptr assignment in a slow path, I'd prefer
> it was non-optional, otherwise it'll be as underused as the other
> debugging options.
>
Yes, agreed.
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