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SubjectRe: [PATCH 04/16] page-flags: define PG_locked behavior on compound pages
On Thu, 19 Mar 2015, Kirill A. Shutemov wrote:

> SLUB uses PG_locked as a bit spin locked. IIUC, tail pages should never
> appear there. VM_BUG_ON() is added to make sure that this assumption is
> correct.

Its really not worth checking that AFAICT. Tail page pointers are not
used.


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