[RFC] perf: fix building for ARCv1

[Vineet Gupta]

+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