Hi John,
On Mon, 17 Dec 2007, John Reiser wrote:
> idr_pre_get calls kmem_cache_alloc, which constructs 'struct idr_layer'
> via the cachep->ctor() call from cache_alloc_debugcheck_after to
> idr_cache_ctor, and not via cache_init_objs. So if DEBUG is off,
> then idr_cache_ctor does not get its chance to call memset,
> which could leave the struct idr_layer potentially undefined.
No, init_cache_objs() will call the constructor, if the cache has one when
DEBUG is not set so the struct idr_layer can never be undefined. However,
struct idr_layer can contain non-zero elements if someone does a
kmem_cache_free() on an object that hasn't been zeroed. If that matters
here, idr_pre_get should call kmem_cache_zalloc() and drop the
constructor.
Pekka
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