From: mark gross <mgross@linux.intel.com>
To: speck@linutronix.de
Subject: [MODERATED] Re: [PATCH 1/2] more sampling fun 1
Date: Fri, 21 Feb 2020 14:10:51 -0800 [thread overview]
Message-ID: <20200221221051.GA87914@mtg-dev.jf.intel.com> (raw)
In-Reply-To: <2847e79bd70becdc174a4bd890c1be6b37247e43.camel@decadent.org.uk>
On Thu, Feb 20, 2020 at 07:08:45PM +0000, speck for Ben Hutchings wrote:
> On Thu, 2020-02-06 at 14:11 -0800, speck for mark gross wrote:
> > From: mark gross <mgross@linux.intel.com>
> > Subject: [PATCH 1/2] Add capability to specify a range of steppings in the
> [...]
> > --- a/arch/x86/include/asm/cpu_device_id.h
> > +++ b/arch/x86/include/asm/cpu_device_id.h
> > @@ -35,7 +35,19 @@ struct x86_cpu_desc {
> > .x86_microcode_rev = (revision), \
> > }
> >
> > +/*
> > + * Match a range of steppings
> > + */
> > +
> > +struct x86_cpu_id_ext {
> > + struct x86_cpu_id id;
> > + __u16 steppings; /* bit map of steppings to match against */
> > +};
> > +
> > +#define X86_STEPPING_ANY 0
> [...]
>
> Minor point, but wouldn't it make more sense to define X86_STEPPING_ANY
> as GENMASK(15, 0)? Then it's no longer a special case.
>
Right, I had initialy used basicaly the equivelent (-1 or 0xFFFF) for
X86_STEPPING_ANY but, it was pointed out that other similar usages use 0 as a
flag for "ANY" and was encuraged to mimic that logic. See X86_FAMILY_ANY,
X86_MODEL_ANY, X86_FEATURE_ANY.
I'm cool with either way.
Given this background do you still encurage using GENMASK(15,0)?
--mark
next prev parent reply other threads:[~2020-02-21 22:10 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <c79feecdb14c62e3dd8f2680bc68292f99882aeb.158215=?utf-8?q?2322?= .git.mgross@linux.intel.com>
2020-02-20 19:08 ` [MODERATED] Re: [PATCH 1/2] more sampling fun 1 Ben Hutchings
2020-02-21 22:10 ` mark gross [this message]
2020-02-20 10:07 Borislav Petkov
2020-02-20 10:10 ` Andrew Cooper
2020-02-20 10:13 ` [MODERATED] " Borislav Petkov
2020-02-20 11:00 ` [MODERATED] " Andrew Cooper
2020-02-20 12:39 ` Greg KH
2020-02-20 17:53 ` mark gross
2020-02-20 18:26 ` Borislav Petkov
2020-02-20 19:24 ` mark gross
2020-02-21 22:12 ` mark gross
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