Re: [PATCH] mm: Add additional consistency check

[Christoph Lameter]

On Tue, 18 Apr 2017, Michal Hocko wrote:

> Are you even reading those emails? First of all we are talking about
> slab here. Secondly I've already pointed out that the BUG_ON(!PageSlab)
> in kmem_freepages is already too late because we do operate on a
> potential garbage from invalid page...

Before I forget:

1. The patch affects both slab and slub since it patches mm/slab.h and is
called by both allocators.

2. The check in the patch we are discussing here when calling
kmem_cache_free() will be executing before kmem_freepages() is called
in slab.