From: Thomas Gleixner <tglx@linutronix.de>
To: "Yang, Bin" <bin.yang@intel.com>
Cc: "mingo@kernel.org" <mingo@kernel.org>,
"hpa@zytor.com" <hpa@zytor.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"peterz@infradead.org" <peterz@infradead.org>,
"Gross, Mark" <mark.gross@intel.com>,
"x86@kernel.org" <x86@kernel.org>,
"Hansen, Dave" <dave.hansen@intel.com>
Subject: Re: [PATCH v3 4/5] x86/mm: optimize static_protection() by using overlap()
Date: Fri, 7 Sep 2018 10:21:56 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.21.1809071019020.1402@nanos.tec.linutronix.de> (raw)
In-Reply-To: <cd73f43a15f06c720bb4907d2c424dfb3f0c8683.camel@intel.com>
On Fri, 7 Sep 2018, Yang, Bin wrote:
> On Fri, 2018-09-07 at 09:49 +0200, Thomas Gleixner wrote:
> > On Fri, 7 Sep 2018, Yang, Bin wrote:
> > > On Tue, 2018-09-04 at 14:22 +0200, Thomas Gleixner wrote:
> > >
> > > I just write a test.c to compare the result between overlap() and
> > > original within().
> >
> > You are right. Your version of doing the overlap exclusive works. I misread
> > the conditions. I still prefer doing inclusive checks because they are way
> > more obvious.
>
> I am sorry for my poor english. What is "inclusive checks"?
Exlusive: val >= start && val < end
Inclusive: val >= start && val <= end
So the difference is that you feed exclusive with:
end = start + size
and inclusive with
end = start + size - 1
Thanks,
tglx
next prev parent reply other threads:[~2018-09-07 8:22 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-21 1:16 [PATCH v3 0/5] x86/mm: fix cpu stuck issue in __change_page_attr_set_clr Bin Yang
2018-08-21 1:16 ` [PATCH v3 1/5] x86/mm: avoid redundant checking if pgprot has no change Bin Yang
2018-09-03 21:57 ` Thomas Gleixner
2018-09-04 7:01 ` Yang, Bin
2018-09-04 7:49 ` Thomas Gleixner
2018-09-04 9:12 ` Yang, Bin
2018-09-04 9:22 ` Yang, Bin
2018-08-21 1:16 ` [PATCH v3 2/5] x86/mm: avoid static_protection() checking if not whole large page attr change Bin Yang
2018-08-21 1:16 ` [PATCH v3 3/5] x86/mm: add help function to check specific protection flags in range Bin Yang
2018-09-03 22:10 ` Thomas Gleixner
2018-09-04 6:22 ` Yang, Bin
2018-08-21 1:16 ` [PATCH v3 4/5] x86/mm: optimize static_protection() by using overlap() Bin Yang
2018-09-04 12:22 ` Thomas Gleixner
2018-09-07 1:14 ` Yang, Bin
2018-09-07 7:49 ` Thomas Gleixner
2018-09-07 8:04 ` Yang, Bin
2018-09-07 8:21 ` Thomas Gleixner [this message]
2018-09-07 8:26 ` Yang, Bin
2018-08-21 1:16 ` [PATCH v3 5/5] x86/mm: add WARN_ON_ONCE() for wrong large page mapping Bin Yang
2018-09-03 22:27 ` Thomas Gleixner
2018-09-04 6:32 ` Yang, Bin
2018-09-04 7:41 ` Thomas Gleixner
2018-09-04 16:52 ` Thomas Gleixner
2018-09-07 2:12 ` Yang, Bin
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