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