[BUG] Revert 0b05e2d671c4 'powerpc/32: cacheable_memcpy becomes memcpy'

Thomas Gleixner tglx at linutronix.de
Thu Sep 17 20:13:15 AEST 2015

On Wed, 16 Sep 2015, Steven Rostedt wrote:
> On Wed, 16 Sep 2015 22:01:06 +0200 (CEST)
> Thomas Gleixner <tglx at linutronix.de> wrote:
> > So now I have to chase down that one:
> > 
> > [    0.230210] ftrace: allocating 16560 entries in 49 pages
> > [    0.273313] ------------[ cut here ]------------
> > [    0.278048] WARNING: at /home/tglx/work/kernel/tip/tip/kernel/trace/ftrace.c:1974
> OK, so this is where ftrace converts the mcount to nops.
> Just to be clear, there's nothing in the command line that enables any
> function tracing, is there?

Nothing on the command line.

> > Happens somewhere between the powerpc merge and rc1. System boots up
> > to userspace and then locks hard ....

Digging deeper. My assumption that it's a post powerpc merge failure
turned out to be wrong.

Some more data points. I see the above splat with


It goes away with 


But the box still does not get to the login prompt.


makes it work again.

It's not observable before the ppc merge, but I can't identify the
culprit by bisection. bisection led into lala land.



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