Re: [PATCH] slab: deal with NULL pointers passed to kmem_cache_free

[Christoph Lameter <clameter@sgi.com>]

On Mon, 19 Mar 2007, Matt Mackall wrote:

> I think this sort of thing should work:
> 
> a = kmalloc(...)
> b = kmem_cache_alloc(..)
> c = allocate_some_id(...)
> if (!a || !b || !c) {
>    free_some_id(c)
>    kmem_cache_free(c)

^^^^ this requires the specification of a kmem_cache structure and the 
object must be allocated by that cache.

>    kfree(a);

Here we dynamically determine the slab cache and do not verify even which 
slab it came from.

So you can always use kfree if you do not care. kmem_cache_free verifies
correctness.