linux-kernel - Re: [PATCH v2] platform: x86: Support Turbo Boost Max 3.0 for non HWP systems

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <1484855022.2833.36.camel@linux.intel.com>
Date:   Thu, 19 Jan 2017 11:43:42 -0800
From:   Tim Chen <tim.c.chen@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        dvhart@...radead.org
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] platform: x86: Support Turbo Boost Max 3.0 for non
 HWP systems

On Thu, 2017-01-19 at 12:38 +0200, Andy Shevchenko wrote:
> On Wed, 2017-01-18 at 14:40 -0800, Tim Chen wrote:
> > 
> > On Wed, 2017-01-18 at 10:29 -0800, Srinivas Pandruvada wrote:
> > > 
> > >  
> > > +
> > > +static int itmt_legacy_cpu_online(unsigned int cpu)
> > > +{
> > > +	static u32 max_highest_perf = 0, min_highest_perf =
> > > U32_MAX;
> > Should the max_highest_perf and min_highest_perf be defined and
> > initialized
> > outside this function?  Otherwise the max and min value will be lost
> > and reset
> > each time a new cpu comes online.
> > 
> > We will always find max_highest_perf == min_highest_perf.
> Perhaps you missed static keyword there. Their behaviour is the same as
> for global variables, i.e. the initial value assigned only at the
> beginning.
> 

Yes I did miss the static modifier. Sorry for the noise.

Tim