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arm64: entry: Use preempt_count() and need_resched() helper

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The generic entry code uses preempt_count() and need_resched() helpers to
check if it should do preempt_schedule_irq(). Currently, arm64 use its own
check logic, that is "READ_ONCE(current_thread_info()->preempt_count == 0",
which is equivalent to "preempt_count() == 0 && need_resched()".

In preparation for moving arm64 over to the generic entry code, use
these helpers to replace arm64's own code and move it ahead.

No functional changes.

Reviewed-by: Ada Couprie Diaz <ada.coupriediaz@arm.com>
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Jinjie Ruan 2025-08-15 11:06:29 +08:00 committed by Will Deacon
parent 77c1953946
commit c74c44c6ae
1 changed files with 4 additions and 10 deletions
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14
arch/arm64/kernel/entry-common.c
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@ -299,14 +299,6 @@ static inline bool arm64_preempt_schedule_irq(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
@ -701,8 +693,10 @@ static __always_inline void __el1_irq(struct pt_regs *regs,
do_interrupt_handler(regs, handler);
irq_exit_rcu();
if (arm64_preempt_schedule_irq())
preempt_schedule_irq();
if (!preempt_count() && need_resched()) {
if (arm64_preempt_schedule_irq())
preempt_schedule_irq();
}
exit_to_kernel_mode(regs, state);
}