Re: [PATCH 3/3] riscv: add PREEMPT_LAZY support

From: Palmer Dabbelt
Date: Thu Oct 17 2024 - 17:50:07 EST


On Wed, 09 Oct 2024 06:05:30 PDT (-0700), bigeasy@xxxxxxxxxxxxx wrote:
On 2024-10-09 15:03:07 [+0200], Peter Zijlstra wrote:
> diff --git a/arch/riscv/include/asm/thread_info.h b/arch/riscv/include/asm/thread_info.h
> index 9c10fb180f438..8b5a5ddea4293 100644
> --- a/arch/riscv/include/asm/thread_info.h
> +++ b/arch/riscv/include/asm/thread_info.h
> @@ -107,6 +107,7 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
> * - pending work-to-be-done flags are in lowest half-word
> * - other flags in upper half-word(s)
> */
> +#define TIF_NEED_RESCHED_LAZY 0 /* Lazy rescheduling needed */
> #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
> #define TIF_SIGPENDING 2 /* signal pending */
> #define TIF_NEED_RESCHED 3 /* rescheduling necessary */

So for x86 I shuffled the flags around to have the two NEED_RESCHED ones
side-by-side. Not strictly required ofcourse, but...

I can shuffle them. I don't think the riscv camp will complain (saying
this for them to actual complain if so).

Acked-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx>