linux-kernel - Re: [PATCH 1/3] arc: vdk: Disable halt on reset

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Message-ID: <1485971550.5515.34.camel@synopsys.com>
Date:   Wed, 1 Feb 2017 17:52:30 +0000
From:   Alexey Brodkin <Alexey.Brodkin@...opsys.com>
To:     Vineet Gupta <Vineet.Gupta1@...opsys.com>
CC:     Ruud Derwig <Ruud.Derwig@...opsys.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>
Subject: Re: [PATCH 1/3] arc: vdk: Disable halt on reset

Hi Vineet,

On Wed, 2017-02-01 at 09:37 -0800, Vineet Gupta wrote:
> On 02/01/2017 09:14 AM, Alexey Brodkin wrote:
> > 
> > > 
> > > > 
> > > > -# CONFIG_ARC_TIMERS_64BIT is not set
> > > 
> > > Are you sure abut this part. Ater the timers driver rework, this would enable GFRC
> > > for SMP builds and AFAIKR there were some issues with time with GFRC + nSIM etc..
> > 
> > Not anymore :)
> > 
> > Probably I missed something in discussions.
> 
> STAR 9000879565, 9000879563
> 
> > 
> > As a matter of fact I did run-test resulting vmlinux and it worked very nice.
> > More over ARC_TIMERS_64BIT is selected automatically by ISA_ARCV2, see
> > http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/arch/arc/Kconfig#n119
> > 
> > That said even if "# CONFIG_ARC_TIMERS_64BIT is not set" is left in place the option will be
> > effectively enabled, no?
> 
> The whole point of adding this to defconfig is to override the default from Kconfig ?

Not anymore :)

Since commit c4c9a040ecb7 ("clocksource: import ARC timer driver"),
see http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c4c9a040ecb7297e011e579f5a9cc280e42d725f
we have this:
---------------------->8----------------------
config ISA_ARCV2
	bool "ARC ISA v2"
	select ARC_TIMERS_64BIT
---------------------->8----------------------

which really means if one selects ISA_ARCV2 then ARC_TIMERS_64BIT gets selected automatically
and there's no way to override it from either menuconfig or defconfig.

Probably behavior that you meant was to keep a separate "config ARC_TIMERS_64BIT"
and have it "default y if ISA_ARCV2".

-Alexey