[LTP] [PATCH] ftrace_stress_test: check if tracing_enabled is supported

[Steven Rostedt]

On Thu, 2016-02-04 at 15:28 +0100, Cyril Hrubis wrote:
> Hi!
> > When running the tests on RHEL7, got message as below:
> > ---------
> > /mnt/testarea/ltp/testcases/bin/ftrace_stress/ftrace_tracing_enabled.sh: line 25: /mnt/testarea/ltp/testcases/bin/debugfs/tracing/tracing_enabled: Permission denied
> > /mnt/testarea/ltp/testcases/bin/ftrace_stress/ftrace_tracing_enabled.sh: line 26: /mnt/testarea/ltp/testcases/bin/debugfs/tracing/tracing_enabled: Permission denied
> > ---------
> > 
> > The reason is that the tracing_enabled file has been removed
> > since kernel v3.8 by commits:
> > 
> > 02404ba tracing: Remove deprecated tracing_enabled file
> > 0fb9656 tracing: Make tracing_enabled be equal to tracing_on
> > 6752ab4 tracing: Deprecate tracing_enabled for tracing_on
> 
> Looking at the commits shouldn't we use tracing_on instead of
> tracing_enabled on newer kernels?
> 

Yes, and you should be using tracing_on even in older kernels.
tracing_enabled has been deprecated for a long time now.

-- Steve