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[v3,0/2] powerpc: introduce CONFIG_CACHE_FLUSH_WATCHDOG_THRESHOLD

Message ID 20210421091603.1459154-1-rasmus.villemoes@prevas.dk
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Series powerpc: introduce CONFIG_CACHE_FLUSH_WATCHDOG_THRESHOLD | expand

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Rasmus Villemoes April 21, 2021, 9:16 a.m. UTC 
v3: Introduce a little helper function as suggested by Stefan. gcc
generates the same code before and after that refactoring - in
particular, the code is still the same as before these patches when
the config option is left at its default.

Include Stefan's Reviewed-bys.

v2 cover letter:

Back in June, I sent a patch [1] to reduce the number of WATCHDOG_RESET
calls in flush_cache() to one per 64K. Wolfgang rejected that, saying
that the threshold should be configurable.

So here's a new version which introduces a config knob. When left at
its default, the generated code is binary identical to what one gets
before these patches.

I stumbled on the CONFIG_5xx and thought I ought to make the config
knob depend on !CONFIG_5xx, but it turns out it's better to just
remove that piece of legacy, hence the first janitorial patch.

[1] https://lists.denx.de/pipermail/u-boot/2020-June/414852.html

Rasmus Villemoes (2):
  powerpc: lib: remove leftover CONFIG_5xx
  powerpc: introduce CONFIG_CACHE_FLUSH_WATCHDOG_THRESHOLD

 arch/powerpc/Kconfig     |  1 +
 arch/powerpc/lib/Kconfig |  9 +++++++++
 arch/powerpc/lib/cache.c | 17 +++++++++++++----
 3 files changed, 23 insertions(+), 4 deletions(-)
 create mode 100644 arch/powerpc/lib/Kconfig