* [PATCH v2] arm64: use SOFTIRQ_ON_OWN_STACK for enabling softirq stack
@ 2025-11-05 7:42 Ryo Takakura
2025-11-07 20:53 ` Catalin Marinas
0 siblings, 1 reply; 2+ messages in thread
From: Ryo Takakura @ 2025-11-05 7:42 UTC (permalink / raw)
To: will, ardb, bigeasy, catalin.marinas, clrkwllms, leitao,
mark.rutland, rostedt
Cc: linux-arm-kernel, linux-kernel, linux-rt-devel, ryotkkr98
For those architectures with HAVE_SOFTIRQ_ON_OWN_STACK use
their dedicated softirq stack when !PREEMPT_RT. This condition
is ensured by SOFTIRQ_ON_OWN_STACK.
Let arm64 use SOFTIRQ_ON_OWN_STACK as well to select its
usage of the stack.
Signed-off-by: Ryo Takakura <ryotkkr98@gmail.com>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Will Deacon <will@kernel.org>
---
Changes since v1:
[1] https://lore.kernel.org/linux-rt-devel/20251013013508.74677-1-ryotkkr98@gmail.com/
- Add <Reviewed-by> by Sebastian.
- Add <Acked-by> by Will.
---
arch/arm64/kernel/irq.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/kernel/irq.c b/arch/arm64/kernel/irq.c
index c0065a1d7..15dedb385 100644
--- a/arch/arm64/kernel/irq.c
+++ b/arch/arm64/kernel/irq.c
@@ -62,7 +62,7 @@ static void __init init_irq_stacks(void)
}
}
-#ifndef CONFIG_PREEMPT_RT
+#ifdef CONFIG_SOFTIRQ_ON_OWN_STACK
static void ____do_softirq(struct pt_regs *regs)
{
__do_softirq();
--
2.34.1
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH v2] arm64: use SOFTIRQ_ON_OWN_STACK for enabling softirq stack
2025-11-05 7:42 [PATCH v2] arm64: use SOFTIRQ_ON_OWN_STACK for enabling softirq stack Ryo Takakura
@ 2025-11-07 20:53 ` Catalin Marinas
0 siblings, 0 replies; 2+ messages in thread
From: Catalin Marinas @ 2025-11-07 20:53 UTC (permalink / raw)
To: will, ardb, bigeasy, clrkwllms, leitao, mark.rutland, rostedt,
Ryo Takakura
Cc: linux-arm-kernel, linux-kernel, linux-rt-devel
On Wed, 05 Nov 2025 16:42:59 +0900, Ryo Takakura wrote:
> For those architectures with HAVE_SOFTIRQ_ON_OWN_STACK use
> their dedicated softirq stack when !PREEMPT_RT. This condition
> is ensured by SOFTIRQ_ON_OWN_STACK.
>
> Let arm64 use SOFTIRQ_ON_OWN_STACK as well to select its
> usage of the stack.
>
> [...]
Applied to arm64 (for-next/misc), thanks!
[1/1] arm64: use SOFTIRQ_ON_OWN_STACK for enabling softirq stack
https://git.kernel.org/arm64/c/d3b570eba7bf
--
Catalin
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2025-11-05 7:42 [PATCH v2] arm64: use SOFTIRQ_ON_OWN_STACK for enabling softirq stack Ryo Takakura
2025-11-07 20:53 ` Catalin Marinas
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