linux-kernel - Re: [PATCH] mm: create a separate slab for page->ptl allocation

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Date:	Wed, 6 Nov 2013 12:02:00 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Will Deacon <will.deacon@....com>
Cc:	"Kirill A. Shutemov" <kirill@...temov.name>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Ingo Molnar <mingo@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>
Subject: Re: [PATCH] mm: create a separate slab for page->ptl allocation

On Wed, Nov 06, 2013 at 10:34:03AM +0000, Will Deacon wrote:
> FWIW: if the architecture selects ARCH_USE_CMPXCHG_LOCKREF, then a spinlock_t
> is 32-bit (assuming that unsigned int is also 32-bit).

Egads, talk about fragile. That thing relies on someone actually keeping
lib/Kconfig up-to-date.
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