Re: [PATCH 110/110] lib/vdso: Improve do_hres() and update vdso data unconditionally

[Thomas Gleixner]

On Tue, 22 Oct 2019, Huacai Chen wrote:

  https://people.kernel.org/tglx/notes-about-netiquette

Look for Toppost
 
> If we use (s64)cycles < 0, then how to solve the problem that a 64bit
> counter become negative?

I doubt that you will be able to observe that. A 64bit value becomes
negative after 1<<63 cycles, i.e. at 1GHz thats 292 years of uptime.

What's your problem?

Thanks,

	tglx