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

[Peter Zijlstra]

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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