On Tue, 7 Nov 2023 13:56:54 -0800
Ankur Arora <ankur.a.arora@xxxxxxxxxx> wrote:
> This reverts commit 1b2d3451ee50a0968cb9933f726e50b368ba5073.
>
I just realized that the maintainers of these patches are not being Cc'd.
If you want comments, you may want to Cc them. (I didn't do that for this
patch).
-- Steve
> Signed-off-by: Ankur Arora <ankur.a.arora@xxxxxxxxxx>
> ---
> arch/arm64/Kconfig | 1 -
> arch/arm64/include/asm/preempt.h | 19 ++-----------------
> arch/arm64/kernel/entry-common.c | 10 +---------
> 3 files changed, 3 insertions(+), 27 deletions(-)
>
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 78f20e632712..856d7be2ee45 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -221,7 +221,6 @@ config ARM64
> select HAVE_PERF_EVENTS_NMI if ARM64_PSEUDO_NMI
> select HAVE_PERF_REGS
> select HAVE_PERF_USER_STACK_DUMP
> - select HAVE_PREEMPT_DYNAMIC_KEY
> select HAVE_REGS_AND_STACK_ACCESS_API
> select HAVE_POSIX_CPU_TIMERS_TASK_WORK
> select HAVE_FUNCTION_ARG_ACCESS_API
> diff --git a/arch/arm64/include/asm/preempt.h b/arch/arm64/include/asm/preempt.h
> index 0159b625cc7f..e83f0982b99c 100644
> --- a/arch/arm64/include/asm/preempt.h
> +++ b/arch/arm64/include/asm/preempt.h
> @@ -2,7 +2,6 @@
> #ifndef __ASM_PREEMPT_H
> #define __ASM_PREEMPT_H
>
> -#include <linux/jump_label.h>
> #include <linux/thread_info.h>
>
> #define PREEMPT_NEED_RESCHED BIT(32)
> @@ -81,24 +80,10 @@ static inline bool should_resched(int preempt_offset)
> }
>
> #ifdef CONFIG_PREEMPTION
> -
> void preempt_schedule(void);
> +#define __preempt_schedule() preempt_schedule()
> void preempt_schedule_notrace(void);
> -
> -#ifdef CONFIG_PREEMPT_DYNAMIC
> -
> -DECLARE_STATIC_KEY_TRUE(sk_dynamic_irqentry_exit_cond_resched);
> -void dynamic_preempt_schedule(void);
> -#define __preempt_schedule() dynamic_preempt_schedule()
> -void dynamic_preempt_schedule_notrace(void);
> -#define __preempt_schedule_notrace() dynamic_preempt_schedule_notrace()
> -
> -#else /* CONFIG_PREEMPT_DYNAMIC */
> -
> -#define __preempt_schedule() preempt_schedule()
> -#define __preempt_schedule_notrace() preempt_schedule_notrace()
> -
> -#endif /* CONFIG_PREEMPT_DYNAMIC */
> +#define __preempt_schedule_notrace() preempt_schedule_notrace()
> #endif /* CONFIG_PREEMPTION */
>
> #endif /* __ASM_PREEMPT_H */
> diff --git a/arch/arm64/kernel/entry-common.c b/arch/arm64/kernel/entry-common.c
> index 0fc94207e69a..5d9c9951562b 100644
> --- a/arch/arm64/kernel/entry-common.c
> +++ b/arch/arm64/kernel/entry-common.c
> @@ -225,17 +225,9 @@ static void noinstr arm64_exit_el1_dbg(struct pt_regs *regs)
> lockdep_hardirqs_on(CALLER_ADDR0);
> }
>
> -#ifdef CONFIG_PREEMPT_DYNAMIC
> -DEFINE_STATIC_KEY_TRUE(sk_dynamic_irqentry_exit_cond_resched);
> -#define need_irq_preemption() \
> - (static_branch_unlikely(&sk_dynamic_irqentry_exit_cond_resched))
> -#else
> -#define need_irq_preemption() (IS_ENABLED(CONFIG_PREEMPTION))
> -#endif
> -
> static void __sched arm64_preempt_schedule_irq(void)
> {
> - if (!need_irq_preemption())
> + if (!IS_ENABLED(CONFIG_PREEMPTION))
> return;
>
> /*
