lkml.org 
[lkml]   [2021]   [Oct]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Subject[PATCH v2 0/3] irqchip/gic-v3-its: Fix LPI pending table handling vs PREEMPT_RT
Date
Hi folks,

This is my take at fixing [1]. Reading about the LPI tables situation was
entertaining.

Tested against kexec on an Ampere eMAG. Seems to be working fine atop
5.15-rc6. On the other hand, I can only issue one kexec from
5.15-rc6-rt12 - if I then issue another one on the new kernel, I get tasks
hanging. That is true even without my patches and without
CONFIG_PREEMPT_RT.

[1]: http://lore.kernel.org/r/20210810134127.1394269-3-valentin.schneider@arm.com

Revisions
=========

v1 -> v2
++++++++

o Ditched RDIST_FLAGS renaming; moved to "RD_LOCAL" prefix for new flags
(Marc)
o Simplified cpuhp callback logic: body now runs at most once per CPU
o Changed cpuhp callback installation to happen *after* the BP has invoked
its_cpu_init(); the BP cpuhp state is immediately set to CPUHP_ONLINE, so
cpuhp state alone doesn't guarantee its_cpu_init() has been run.

Cheers,
Valentin

Valentin Schneider (3):
irqchip/gic-v3-its: Give the percpu rdist struct its own flags field
irqchip/gic-v3-its: Postpone LPI pending table freeing and memreserve
irqchip/gic-v3-its: Limit memreserve cpuhp state lifetime

drivers/irqchip/irq-gic-v3-its.c | 82 +++++++++++++++++++++++++++---
drivers/irqchip/irq-gic-v3.c | 1 +
include/linux/irqchip/arm-gic-v3.h | 4 +-
3 files changed, 79 insertions(+), 8 deletions(-)

--
2.25.1

\
 
 \ /
  Last update: 2021-10-27 17:16    [W:0.158 / U:3.612 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site