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

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Message-ID: <alpine.DEB.2.21.1910231037500.2308@nanos.tec.linutronix.de>
Date:   Wed, 23 Oct 2019 10:48:11 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Huacai Chen <chenhc@...ote.com>
cc:     Andy Lutomirski <luto@...nel.org>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>, Arnd Bergmann <arnd@...db.de>,
        Paul Burton <paul.burton@...s.com>,
        "open list:MIPS" <linux-mips@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 110/110] lib/vdso: Improve do_hres() and update vdso data
 unconditionally

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