linux-kernel - Re: [RFC] perf: fix building for ARCv1

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Date:	Thu, 4 Feb 2016 09:43:38 +0530
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
	Noam Camus <noamc@...hip.com>
CC:	"linux-perf-users@...r.kernel.org" <linux-perf-users@...r.kernel.org>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"dvhart@...ux.intel.com" <dvhart@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"acme@...hat.com" <acme@...hat.com>,
	"andi@...stfloor.org" <andi@...stfloor.org>,
	"noamc@...hip.com" <noamc@...hip.com>,
	"dsahern@...il.com" <dsahern@...il.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"linux-snps-arc@...ts.infradead.org" 
	<linux-snps-arc@...ts.infradead.org>,
	"giladb@...hip.com" <giladb@...hip.com>
Subject: Re: [RFC] perf: fix building for ARCv1

+CC Noam

On Wednesday 03 February 2016 09:50 PM, Alexey Brodkin wrote:
>> I agree with the current solution to add -atomic to for arc700 builds.
>> > Although making that default for arc700 tools will be better but that will not fix
>> > things before next release of tools etc.
>> > 
>> > But we *do* need to improve generic solution
>> > 1. Add atomics detection in perf to add fall back arch stubs
>> > 2. ARC needs to add syscall for facilitating atomic r-m-w !
> So the most recent ARC GNU tools (2015.12) were just released yesterday
> and still atomics are disabled by default for ARCv1.
> That means perf will continue to fail on building for now.
> 
> Do you think we may apply my initial fix to 4.5 while it is in development and
> then to stable trees as well?

Noam, what's the atomic story for EZChip. Do you support such things for user
space in GNU tools. If -atomic is added to perf user space builds are you guys OK!

-Vineet