Re: [PATCH] staging: lustre: replace kzalloc with copy_from_user with memdup_user

[Julia Lawall <julia.lawall@lip6.fr>]

On Fri, 3 Apr 2015, Drokin, Oleg wrote:

> Hello!
> 
> On Apr 2, 2015, at 6:18 AM, Julia Lawall wrote:
> 
> >> Julia, I wonder if you happen to have a bunch of other patches to get rid of the rest of OBD_ALLOC and OBD_FREE stuff by any chance?
> > I can generate them again, but I wasn't clear on what was wanted.  I would
> > really prefer something where it is explicit at the call site that an
> > assignment is taking place.  If we can have x = obd_alloc(...) and
> > obd_free(x,...) (I don't have time to look up the exact arguments at the
> > moment), then I can take care of that).  I still think it is too bad that
> > this code won't benefit from rules written for more generic memory
> > allocation functions, but if the extra debugging facility provided by
> > these functions is useful, then I guess it is reasonable to keep it.
> 
> Like I mentioned sometime last year - it's now pretty easy to replace the memleak
> detection with other in-kernel mechanisms some of which are in fact even better
> than what we have. And considering our mechanisms are totally broken now by the mixup of
> wrapped vs nonwrapped allocation/freeing - there's no point in holding to it remaining at all.
> The only last bit of useful functionality left, I imagine, is the ability to redirect allocation
> to regular kmalloc or to vmalloc based on the allocation size (there's kvfree already for the
> freeing part of it).
> Other than that the wrappers could go away at any time now, I think.

OK, thanks.

julia