On 10/9/21 20:24, Sven Schnelle wrote: > Out of curiosity i enabled CONFIG_PREEMPT on my c8000. The kernel didn't > even compile. After fixing compilation i noticed a lot of segmentation > faults - usually a few processes crashed already at boot, with sshd the > most notable one. Most of the time the processes where crashing with a > DTLB or ITLB miss. > > With these fixes, i was able to compile a linux kernel on the c8000 > with preemption enabled without crashes. Thank you Sven. I've merged this series into my for-next-v5.15 branch: https://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux.git/log/?h=for-next-v5.15 Helge > Changes in v2: > - also fix flush_cache_range(), also extend the preemption-disabled > region to the end of the function, as there's also a tlb flush in > the last for loop > - add patch to deduplicate code a bit > > Sven Schnelle (5): > parisc: disable preemption during local tlb flush > parisc: deduplicate code in flush_cache_mm() and flush_cache_range() > parisc: fix preempt_count() check in entry.S > parisc: disable preemption in send_IPI_allbutself() > parisc: fix warning in flush_tlb_all > > arch/parisc/kernel/cache.c | 87 ++++++++++++++++---------------------- > arch/parisc/kernel/entry.S | 4 +- > arch/parisc/kernel/smp.c | 4 +- > arch/parisc/mm/init.c | 4 +- > 4 files changed, 43 insertions(+), 56 deletions(-) >
