Re: [PATCH v2 1/7] timekeeping: introduce __current_kernel_time64

From: Stefano Stabellini
Date: Tue Nov 10 2015 - 09:37:57 EST

On Tue, 10 Nov 2015, Peter Zijlstra wrote:
> On Tue, Nov 10, 2015 at 11:57:49AM +0000, Stefano Stabellini wrote:
> > __current_kernel_time64 returns a struct timespec64, without taking the
> > xtime lock. Mirrors __current_kernel_time/current_kernel_time.
> It always helps if you include a reason why you want a patch.

You are right, sorry.

I need to get the current_kernel_time from a pvclock_gtod callback
function, which cannot take the lock again.

On x86 we are just calling __current_kernel_time() (see
arch/x86/xen/time.c:xen_pvclock_gtod_notify). I was introducing the same
functionality on ARM, when the maintainers pointed out that it might be
better to use struct timespec64 and related functions for
future-proofness. To do that I need a version of __current_kernel_time
which returns a struct timespec64.
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