linux-kernel - Re: [RFC PATCH v2 05/14] x86/hpet: Relocate flag definitions to a header file

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Date:   Mon, 8 Apr 2019 19:04:32 -0700
From:   Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...e.de>,
        Ashok Raj <ashok.raj@...el.com>,
        Andi Kleen <andi.kleen@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        Ricardo Neri <ricardo.neri@...el.com>,
        "H. Peter Anvin" <hpa@...or.com>, Tony Luck <tony.luck@...el.com>,
        Clemens Ladisch <clemens@...isch.de>,
        Arnd Bergmann <arnd@...db.de>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [RFC PATCH v2 05/14] x86/hpet: Relocate flag definitions to a
 header file

On Tue, Mar 26, 2019 at 10:11:16PM +0100, Thomas Gleixner wrote:
> On Wed, 27 Feb 2019, Ricardo Neri wrote:
> 
> > Users of HPET timers (such as the hardlockup detector) need the definitions
> > of these flags to interpret the configuration of a timer as passed by
> > platform code.
> 
> Which platform code?

Sorry, it is not platform code. Shall I call it the HPET-enabling code?
> 
> > +#define HPET_DEV_USED_BIT		2
> > +#define HPET_DEV_USED			(1 << HPET_DEV_USED_BIT)
> > +#define HPET_DEV_VALID			0x8
> > +#define HPET_DEV_FSB_CAP		0x1000
> > +#define HPET_DEV_PERI_CAP		0x2000
> 
> I'm not seing why you would need any of those in the watchdog code.
> 
> The only function related to the watchdog which needs these is
> hpet_hardlockup_detector_assign_timer() and that is located in hpet.c
> itself.

Yes, I see now that it is not needed. This patch can be removed.

Thanks and BR,
Ricardo