Re: x86: A fast way to check capabilities of the current cpu

[H. Peter Anvin]

On 12/15/2010 01:30 PM, Miguel Ojeda wrote:
> 
> In this case it this_cpu_*_test_bit() return an int, but they act as a
> bool and are used in if()s; where is the catch?
> 

If they aren't, and are stored in a variable for whatever reason, then
the || form will generate additional instructions to booleanize the
value for no good reason.

	-hpa
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/