[PATCH] Fix infinite loop in ARM user perf_event backtrace code

[Jamie Iles]

Hi,

On Fri, Apr 15, 2011 at 08:27:25PM -0700, Sonny Rao wrote:
> The ARM user backtrace code can get into an infinite loop if it
> runs into an invalid stack frame which points back to itself.
> This situation has been observed in practice.  Fix it by capping
> the number of entries in the backtrace.  This is also what other
> architectures do in their backtrace code.

Tested on my v6k board and looks good.

> Signed-off-by: Sonny Rao <sonnyrao at chromium.org>

Acked-by: Jamie Iles <jamie at jamieiles.com>

Jamie