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riscv: add PREEMPT_LAZY support

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riscv has switched to GENERIC_ENTRY, so adding PREEMPT_LAZY is as simple
as adding TIF_NEED_RESCHED_LAZY related definitions and enabling
ARCH_HAS_PREEMPT_LAZY.

[bigeasy: Replace old PREEMPT_AUTO bits with new PREEMPT_LAZY ]

Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
Link: https://lkml.kernel.org/r/20241021151257.102296-4-bigeasy@linutronix.de
This commit is contained in:
Jisheng Zhang 2024-10-21 17:08:42 +02:00 committed by Peter Zijlstra
parent 476e8583ca
commit 22aaec357c
2 changed files with 7 additions and 4 deletions
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1
arch/riscv/Kconfig
View File

@ -39,6 +39,7 @@ config RISCV
select ARCH_HAS_MMIOWB
select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
select ARCH_HAS_PMEM_API
select ARCH_HAS_PREEMPT_LAZY
select ARCH_HAS_PREPARE_SYNC_CORE_CMD
select ARCH_HAS_PTE_DEVMAP if 64BIT && MMU
select ARCH_HAS_PTE_SPECIAL

10
arch/riscv/include/asm/thread_info.h
View File

@ -107,9 +107,10 @@ 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_NOTIFY_RESUME 1 /* callback before returning to user */
#define TIF_SIGPENDING 2 /* signal pending */
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
#define TIF_NEED_RESCHED 0 /* rescheduling necessary */
#define TIF_NEED_RESCHED_LAZY 1 /* Lazy rescheduling needed */
#define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
#define TIF_SIGPENDING 3 /* signal pending */
#define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */
#define TIF_MEMDIE 5 /* is terminating due to OOM killer */
#define TIF_NOTIFY_SIGNAL 9 /* signal notifications exist */
@ -117,9 +118,10 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
#define TIF_32BIT 11 /* compat-mode 32bit process */
#define TIF_RISCV_V_DEFER_RESTORE 12 /* restore Vector before returing to user */
#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
#define _TIF_NEED_RESCHED_LAZY (1 << TIF_NEED_RESCHED_LAZY)
#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
#define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL)
#define _TIF_UPROBE (1 << TIF_UPROBE)
#define _TIF_RISCV_V_DEFER_RESTORE (1 << TIF_RISCV_V_DEFER_RESTORE)