[v5, 01/10] powerpc64/ftrace: Add a field in paca to disable ftrace in unsafe code paths

[Michael Ellerman]

On Thu, 2018-04-19 at 07:04:00 UTC, "Naveen N. Rao" wrote:
> We have some C code that we call into from real mode where we cannot
> take any exceptions. Though the C functions themselves are mostly safe,
> if these functions are traced, there is a possibility that we may take
> an exception. For instance, in certain conditions, the ftrace code uses
> WARN(), which uses a 'trap' to do its job.
> 
> For such scenarios, introduce a new field in paca 'ftrace_enabled',
> which is checked on ftrace entry before continuing. This field can then
> be set to zero to disable/pause ftrace, and set to a non-zero value to
> resume ftrace.
> 
> Signed-off-by: Naveen N. Rao <naveen.n.rao at linux.vnet.ibm.com>

Series applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/ea678ac627e01daf5b4f1da24bf1d0

cheers