[0/3] genirq: oneshot-safe threaded EOIs

Message

Samuel Holland Nov. 26, 2022, 11:41 p.m. UTC

This is the optimization that I promised back in
https://lore.kernel.org/lkml/[e-mail]/
and got back around to cleaning up. To quote that cover letter:

"A further optimization is to take advantage of the fact that multiple
IRQs can be claimed at once. This allows removing the mask operations
for oneshot IRQs -- i.e. the combination of IRQCHIP_ONESHOT_SAFE and
IRQCHIP_EOI_THREADED, which is not currently supported."

Or in other words, we reuse the oneshot infrastructure for EOIs instead
of masking.

There a a few functions/variables that probably should be renamed now
that I have muddied what "oneshot" means. I elected not to do that in
this version to avoid distracting from the functional changes.


Samuel Holland (3):
  genirq: Simplify cond_unmask_eoi_irq()
  genirq: Add support for oneshot-safe threaded EOIs
  irqchip/sifive-plic: Enable oneshot-safe threaded EOIs

 drivers/irqchip/irq-sifive-plic.c |  2 ++
 kernel/irq/chip.c                 | 21 ++++++++++++---------
 kernel/irq/manage.c               | 15 ++++++++++-----
 3 files changed, 24 insertions(+), 14 deletions(-)