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entry: Add arch_irqentry_exit_need_resched() for arm64

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Compared to the generic entry code, ARM64 does additional checks
when deciding to reschedule on return from interrupt. So introduce
arch_irqentry_exit_need_resched() in the need_resched()
condition of the generic raw_irqentry_exit_cond_resched(), with
a NOP default. This will allow ARM64 to implement the architecture
specific version for switching over to the generic entry code.

Suggested-by: Ada Couprie Diaz <ada.coupriediaz@arm.com>
Suggested-by: Mark Rutland <mark.rutland@arm.com>
Suggested-by: Kevin Brodsky <kevin.brodsky@arm.com>
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
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 11:06:30 +08:00 committed by Will Deacon
parent c74c44c6ae
commit 3c973c51bf
1 changed files with 15 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

16
kernel/entry/common.c
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@ -143,6 +143,20 @@ noinstr irqentry_state_t irqentry_enter(struct pt_regs *regs)
return ret;
}
/**
* arch_irqentry_exit_need_resched - Architecture specific need resched function
*
* Invoked from raw_irqentry_exit_cond_resched() to check if resched is needed.
* Defaults return true.
*
* The main purpose is to permit arch to avoid preemption of a task from an IRQ.
*/
static inline bool arch_irqentry_exit_need_resched(void);
#ifndef arch_irqentry_exit_need_resched
static inline bool arch_irqentry_exit_need_resched(void) { return true; }
#endif
void raw_irqentry_exit_cond_resched(void)
{
if (!preempt_count()) {
@ -150,7 +164,7 @@ void raw_irqentry_exit_cond_resched(void)
rcu_irq_exit_check_preempt();
if (IS_ENABLED(CONFIG_DEBUG_ENTRY))
WARN_ON_ONCE(!on_thread_stack());
if (need_resched())
if (need_resched() && arch_irqentry_exit_need_resched())
preempt_schedule_irq();
}
}