On Fri, 1 Jun 2007, Christoph Lameter wrote:
>
> Instead of returning the smallest available object return ZERO_SIZE_PTR.
Ok, I just noticed that this still has a bug: not just kfree(), but
krealloc() needs to treat ZERO_SIZE_PTR properly.
Your patch introduces two bugs in mm/slub.c:krealloc():
- The
if (unlikely(!p))
return kmalloc(new_size, flags);
test needs to be for NULL or ZERO_SIZE_PTR. Otherwise it will oops in
ksize(p), I think.
- And the
if (unlikely(!new_size)) {
kfree(p);
return NULL;
}
thing should logically return ZERO_SIZE_PTR instead of NULL.
So basically
krealloc(kmalloc(0), n, flags);
must work, and
krealloc(old, 0, flags)
should return a zero-sized allocation.
I'd forgotten about krealloc(), because that whole concept is fairly new.
Linus
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