On Fri, Oct 02, 2015 at 05:37:51PM +0100, Marc Zyngier wrote:
> +static inline bool gic_enable_sre(void)
> +{
> + u64 val;
> +
> + asm volatile("mrs_s %0, " __stringify(ICC_SRE_EL1) : "=r" (val));
> + if (val & ICC_SRE_EL1_SRE)
> + return true;
> +
> + val |= ICC_SRE_EL1_SRE;
> + asm volatile("msr_s " __stringify(ICC_SRE_EL1) ", %0" : : "r" (val));
> + isb();
> + asm volatile("mrs_s %0, " __stringify(ICC_SRE_EL1) : "=r" (val));
> +
> + return !!(val & ICC_SRE_EL1_SRE);
> +}
I don't think !! is needed ;). Apparently, from ISO C99: "When any
scalar value is converted to _Bool, the result is 0 if the value
compares equal to 0; otherwise, the result is 1."
--
Catalin
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