Commit 704f06ee authored by Huacai Chen's avatar Huacai Chen
Browse files

LoongArch: Allow to enable PREEMPT_LAZY 



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: default avatarXi Ruoyao <xry111@xry111.site>
Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent be2ea982

arch/loongarch/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -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

arch/loongarch/include/asm/thread_info.h

+5 −3
Original line number Diff line number Diff line
@@ -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)