powerpc/traps: Avoid rate limit messages from show unhandled signals

[Michael Ellerman]

On Fri, 2018-08-17 at 06:55:00 UTC, Michael Ellerman wrote:
> In the recent commit to add an explicit ratelimit state when showing
> unhandled signals, commit 35a52a10c3ac ("powerpc/traps: Use an
> explicit ratelimit state for show_signal_msg()"), I put the check of
> show_unhandled_signals and the ratelimit state before the call to
> unhandled_signal() so as to avoid unnecessarily calling the latter
> when show_unhandled_signals is false.
> 
> However that causes us to check the ratelimit state on every call, so
> if we take a lot of *handled* signals that has the effect of making
> the ratelimit code print warnings that callbacks have been suppressed
> when they haven't.
> 
> So rearrange the code so that we check show_unhandled_signals first,
> then call unhandled_signal() and finally check the ratelimit state.
> 
> Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
> Reviewed-by: Murilo Opsfelder Araujo <muriloo at linux.ibm.com>

Applied to powerpc next.

https://git.kernel.org/powerpc/c/997dd26cb3c8b7c9b8765751cc1491

cheers