Re: [PATCH RT 0/3] riscv: add PREEMPT_RT support

Jisheng Zhang
2023-10-23T16:52:36Z

On Mon, Oct 23, 2023 at 04:33:13PM +0000, Schaffner, Tobias wrote:
> On 10.05.23 18:24, Jisheng Zhang wrote:
> > This series is to add PREEMPT_RT support to riscv. Compared with last
> > try[1], there are two major changes:
> >
> > 1. riscv has been converted to Generic Entry. And riscv uses
> > asm-generic/preeempt.h, so we need to patch asm-generic's preeempt to
> > enable lazy preempt support for riscv. This is what patch1 does.
> > However, it duplicates the preempt_lazy_count() defintion, I'm sure
> > there must be an elegant solution. Neverless, it doesn't impact the
> > riscv PREEMPT_RT support itself.
> >
> > 2. three preparation patches(patch1/2/3 in [1]) has been merged in
> > mainline.
> >
> > I back-ported the lastest linux-6.3.y-rt patches to the lastest Linus tree,
> > then cook this series.
> >
> > Link: https://lore.kernel.org/linux-riscv/20220831175920.2806-1-jszhang@kernel.org/
>
> Any news on this series? Are there any open tasks blocking this?
> I am willing to help, but do not see what's missing to get this merged.

Hi Thomas, Sebastian

could you please review? Any comments are appreciated. or do you want a
rebase on linux-6.5.y-rt?

Thanks

>
> > Jisheng Zhang (3):
> > asm-generic/preempt: also check preempt_lazy_count for
> > should_resched() etc.
> > riscv: add lazy preempt support
> > riscv: Allow to enable RT
> >
> > arch/riscv/Kconfig | 2 ++
> > arch/riscv/include/asm/thread_info.h | 5 ++++-
> > arch/riscv/kernel/asm-offsets.c | 1 +
> > include/asm-generic/preempt.h | 8 +++++++-
> > 4 files changed, 14 insertions(+), 2 deletions(-)
> >
>