| Date | Wed, 22 May 2013 12:19:16 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH v2 00/10] uaccess: better might_sleep/might_fault behavior |
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On Wed, May 22, 2013 at 11:25:36AM +0200, Arnd Bergmann wrote: > Calling might_fault() for every __get_user/__put_user is rather expensive > because it turns what should be a single instruction (plus fixup) into an > external function call.
We could hide it all behind CONFIG_DEBUG_ATOMIC_SLEEP just like might_sleep() is. I'm not sure there's a point to might_fault() when might_sleep() is a NOP.
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