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LoongArch: Allow to enable PREEMPT_LAZY

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LoongArch has supported PREEMPT_RT now. It uses GENERIC_ENTRY, so just
add the TIF bit (TIF_NEED_RESCHED_LAZY) related definitions and select
the Kconfig symbol (ARCH_HAS_PREEMPT_LAZY) is enough to make it go.

Signed-off-by: Xi Ruoyao <xry111@xry111.site>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Huacai Chen 2024-11-22 15:47:53 +08:00
parent be2ea982bb
commit 704f06eeff
2 changed files with 6 additions and 3 deletions
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1
arch/loongarch/Kconfig
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@ -23,6 +23,7 @@ config LOONGARCH
select ARCH_HAS_KERNEL_FPU_SUPPORT if CPU_HAS_FPU
select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
select ARCH_HAS_PREEMPT_LAZY
select ARCH_HAS_PTE_DEVMAP
select ARCH_HAS_PTE_SPECIAL
select ARCH_HAS_SET_MEMORY

8
arch/loongarch/include/asm/thread_info.h
View File

@ -66,8 +66,9 @@ register unsigned long current_stack_pointer __asm__("$sp");
* - pending work-to-be-done flags are in LSW
* - other flags in MSW
*/
#define TIF_SIGPENDING 1 /* signal pending */
#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
#define TIF_NEED_RESCHED 0 /* rescheduling necessary */
#define TIF_NEED_RESCHED_LAZY 1 /* lazy rescheduling necessary */
#define TIF_SIGPENDING 2 /* signal pending */
#define TIF_NOTIFY_RESUME 3 /* callback before returning to user */
#define TIF_NOTIFY_SIGNAL 4 /* signal notifications exist */
#define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */
@ -88,8 +89,9 @@ register unsigned long current_stack_pointer __asm__("$sp");
#define TIF_LBT_CTX_LIVE 20 /* LBT context must be preserved */
#define TIF_PATCH_PENDING 21 /* pending live patching update */
#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
#define _TIF_NEED_RESCHED_LAZY (1<<TIF_NEED_RESCHED_LAZY)
#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
#define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL)
#define _TIF_NOHZ (1<<TIF_NOHZ)