On Wed, Oct 09, 2024 at 12:50:57PM +0200, Sebastian Andrzej Siewior wrote: > From: Jisheng Zhang <[email protected]> > > 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 ] > > Cc: Paul Walmsley <[email protected]> > Cc: Palmer Dabbelt <[email protected]> > Cc: Albert Ou <[email protected]> > Cc: [email protected] > Signed-off-by: Jisheng Zhang <[email protected]> > Signed-off-by: Sebastian Andrzej Siewior <[email protected]> > --- > arch/riscv/Kconfig | 1 + > arch/riscv/include/asm/thread_info.h | 2 ++ > 2 files changed, 3 insertions(+) > > diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig > index 62545946ecf43..3516c58480612 100644 > --- a/arch/riscv/Kconfig > +++ b/arch/riscv/Kconfig > @@ -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 > diff --git a/arch/riscv/include/asm/thread_info.h > b/arch/riscv/include/asm/thread_info.h > index 9c10fb180f438..8b5a5ddea4293 100644 > --- a/arch/riscv/include/asm/thread_info.h > +++ b/arch/riscv/include/asm/thread_info.h > @@ -107,6 +107,7 @@ 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_NEED_RESCHED_LAZY 0 /* Lazy rescheduling needed */ > #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ > #define TIF_SIGPENDING 2 /* signal pending */ > #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
So for x86 I shuffled the flags around to have the two NEED_RESCHED ones side-by-side. Not strictly required ofcourse, but...
