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From: Jisheng Zhang <jszhang@kernel.org>
Date: Tue, 31 Oct 2023 22:35:20 +0800
Subject: [PATCH] riscv: add PREEMPT_AUTO support
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.8/older/patches-6.8.2-rt11.tar.xz
riscv has switched to GENERIC_ENTRY, so adding PREEMPT_AUTO is as simple
as adding TIF_ARCH_RESCHED_LAZY related definitions and enabling
HAVE_PREEMPT_AUTO.
Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
arch/riscv/Kconfig | 1 +
arch/riscv/include/asm/thread_info.h | 2 ++
2 files changed, 3 insertions(+)
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -142,6 +142,7 @@ config RISCV
select HAVE_PERF_USER_STACK_DUMP
select HAVE_POSIX_CPU_TIMERS_TASK_WORK
select HAVE_PREEMPT_DYNAMIC_KEY if !XIP_KERNEL
+ select HAVE_PREEMPT_AUTO
select HAVE_REGS_AND_STACK_ACCESS_API
select HAVE_RETHOOK if !XIP_KERNEL
select HAVE_RSEQ
--- a/arch/riscv/include/asm/thread_info.h
+++ b/arch/riscv/include/asm/thread_info.h
@@ -94,6 +94,7 @@ int arch_dup_task_struct(struct task_str
* - pending work-to-be-done flags are in lowest half-word
* - other flags in upper half-word(s)
*/
+#define TIF_ARCH_RESCHED_LAZY 0 /* Lazy rescheduling */
#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
#define TIF_SIGPENDING 2 /* signal pending */
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
@@ -104,6 +105,7 @@ int arch_dup_task_struct(struct task_str
#define TIF_32BIT 11 /* compat-mode 32bit process */
#define TIF_RISCV_V_DEFER_RESTORE 12 /* restore Vector before returing to user */
+#define _TIF_ARCH_RESCHED_LAZY (1 << TIF_ARCH_RESCHED_LAZY)
#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
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