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@xxxxxxxxxx/ 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(-) -- 2.40.1
