44 lines
1.8 KiB
Diff
44 lines
1.8 KiB
Diff
From: Jisheng Zhang <jszhang@kernel.org>
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Date: Tue, 31 Oct 2023 22:35:20 +0800
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Subject: [PATCH] riscv: add PREEMPT_AUTO support
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.6/older/patches-6.6.7-rt18.tar.xz
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riscv has switched to GENERIC_ENTRY, so adding PREEMPT_AUTO is as simple
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as adding TIF_ARCH_RESCHED_LAZY related definitions and enabling
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HAVE_PREEMPT_AUTO.
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Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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arch/riscv/Kconfig | 1 +
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arch/riscv/include/asm/thread_info.h | 2 ++
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2 files changed, 3 insertions(+)
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--- a/arch/riscv/Kconfig
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+++ b/arch/riscv/Kconfig
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@@ -135,6 +135,7 @@ config RISCV
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select HAVE_PERF_USER_STACK_DUMP
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select HAVE_POSIX_CPU_TIMERS_TASK_WORK
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select HAVE_PREEMPT_DYNAMIC_KEY if !XIP_KERNEL
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+ select HAVE_PREEMPT_AUTO
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select HAVE_REGS_AND_STACK_ACCESS_API
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select HAVE_RETHOOK if !XIP_KERNEL
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select HAVE_RSEQ
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--- a/arch/riscv/include/asm/thread_info.h
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+++ b/arch/riscv/include/asm/thread_info.h
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@@ -82,6 +82,7 @@ int arch_dup_task_struct(struct task_str
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* - pending work-to-be-done flags are in lowest half-word
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* - other flags in upper half-word(s)
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*/
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+#define TIF_ARCH_RESCHED_LAZY 0 /* Lazy rescheduling */
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#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
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#define TIF_SIGPENDING 2 /* signal pending */
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#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
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@@ -96,6 +97,7 @@ int arch_dup_task_struct(struct task_str
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#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
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#define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL)
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#define _TIF_UPROBE (1 << TIF_UPROBE)
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+#define _TIF_ARCH_RESCHED_LAZY (1 << TIF_ARCH_RESCHED_LAZY)
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#define _TIF_WORK_MASK \
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(_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | _TIF_NEED_RESCHED | \
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