Re: [v3, 3/3] MIPS: VDSO: Add implementations of gettimeofday() and clock_gettime()

[Leonid Yegoshin]

On 10/28/2015 12:04 PM, Alex Smith wrote:
> On 28 October 2015 at 18:57, Leonid Yegoshin <Leonid.Yegoshin@xxxxxxxxxx> wrote:
> >
> As I've explained the VDSO will only use the CP0 counter in the same
> situations that the kernel would when it is the active clocksource.
> Any issue that makes the counter unreliable affects the kernel as well
> and is unrelated to the VDSO, so a fix does not belong in this patch.

What would you do if some SoC with different type of cores will define 
CPU1 etc CP0_COUNT as a DIFFERENT clocksource from CPU0 (because of 
frequency etc)? Timekeeping can select CPU0 clocksource but code still 
uses a local CPU1 CP0_COUNT for gettimeofday().

And this kind of solution is the first in line to have an accurate 
timing in systems without GIC and with different clock frequencies.

- Leonid

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