Messages in this thread | | | Subject | Re: [PATCH v9 4/9] clocksource/drivers/arm_arch_timer: use readq to get 64-bit CNTVCT | From | Timur Tabi <> | Date | Mon, 25 Jul 2016 10:50:29 -0500 |
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Will Deacon wrote: >> > { >> >- u32 vct_lo, vct_hi, tmp_hi; >> >- >> >- do { >> >- vct_hi = readl_relaxed(arch_counter_base + CNTVCT_HI); >> >- vct_lo = readl_relaxed(arch_counter_base + CNTVCT_LO); >> >- tmp_hi = readl_relaxed(arch_counter_base + CNTVCT_HI); >> >- } while (vct_hi != tmp_hi); >> >- >> >- return ((u64) vct_hi << 32) | vct_lo; >> >+ return readq(arch_counter_base + CNTVCT_LO); > Please drop this patch. It doesn't work.
On systems where readq() does work, wouldn't it be more optimal than the above while-loop?
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