Re: [linux-usb-devel] Re: [PATCH 00/10] usb-serial: Switches from spin lock to atomic_t.

[Arjan van de Ven <arjan@infradead.org>]

On Wed, 2005-12-07 at 10:30 -0200, Luiz Fernando Capitulino wrote:
> On Wed, 07 Dec 2005 13:27:13 +0100
> Arjan van de Ven <arjan@infradead.org> wrote:
> 
> | 
> | >  Isn't it right? Is the URB write so fast that switching to atomic_t
> | > doesn't pay-off?
> | 
> | an atomic_t access and a spinlock are basically the same price... so
> | what's the payoff ?
> 
>  One lock less,

where? spin_unlock in principle runs unlocked on x86 at least
(except for ppro workarounds but those are/should be optional)


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