[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH -next v4 09/19] arm64: entry: Use preempt_count() and need_resched() helper
The "READ_ONCE(current_thread_info()->preempt_count = 0" is equivalent to "preempt_count() == 0 && need_resched()", so use these helpers to replace it, which will make it more clear when switch to generic entry. No functional changes. Signed-off-by: Jinjie Ruan <ruanjinjie@xxxxxxxxxx> --- arch/arm64/kernel/entry-common.c | 14 ++++---------- 1 file changed, 4 insertions(+), 10 deletions(-) diff --git a/arch/arm64/kernel/entry-common.c b/arch/arm64/kernel/entry-common.c index a3414fb599fa..3ea3ab32d232 100644 --- a/arch/arm64/kernel/entry-common.c +++ b/arch/arm64/kernel/entry-common.c @@ -74,14 +74,6 @@ static inline bool arm64_irqentry_exit_need_resched(void) if (!need_irq_preemption()) return false; - /* - * Note: thread_info::preempt_count includes both thread_info::count - * and thread_info::need_resched, and is not equivalent to - * preempt_count(). - */ - if (READ_ONCE(current_thread_info()->preempt_count) != 0) - return false; - /* * DAIF.DA are cleared at the start of IRQ/FIQ handling, and when GIC * priority masking is used the GIC irqchip driver will clear DAIF.IF @@ -129,8 +121,10 @@ static void noinstr exit_to_kernel_mode(struct pt_regs *regs, return; } - if (arm64_irqentry_exit_need_resched()) - preempt_schedule_irq(); + if (!preempt_count()) { + if (need_resched() && arm64_irqentry_exit_need_resched()) + preempt_schedule_irq(); + } trace_hardirqs_on(); } else { -- 2.34.1
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