45 lines
1.8 KiB
Diff
45 lines
1.8 KiB
Diff
|
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/6.11/older/patches-6.11-rt7.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
|
||
|
|
@@ -170,6 +170,7 @@ 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
|
||
|
|
@@ -95,6 +95,7 @@ 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 */
|
||
|
|
@@ -105,6 +106,7 @@ 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)
|