linux-kernel - [PATCH] powerpc: Allow scheduling of IRQ with PREEMPT

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Message-ID: <20241226191238.2559880-1-robert_joslyn@selinc.com>
Date: Thu, 26 Dec 2024 11:12:38 -0800
From: Robert Joslyn <robert_joslyn@...inc.com>
To: <linux-kernel@...r.kernel.org>
CC: <linux-rt-users@...r.kernel.org>, <bigeasy@...utronix.de>,
        <tglx@...utronix.de>, <rostedt@...dmis.org>,
        Robert Joslyn
	<robert_joslyn@...inc.com>
Subject: [PATCH] powerpc: Allow scheduling of IRQ with PREEMPT_RT

This branch is needed to allow preemptible IRQs to be scheduled,
otherwise the kernel hangs during boot on my e300 based platforms.
This branch is needed for both CONFIG_PREEMPT and CONFIG_PREEMPT_RT,
so broaden the check to CONFIG_PREEMPTION, which is selected by both.

This was previously set to CONFIG_PREEMPTION, but was reverted as part
of removing LAZY_PREEMPT support.

Fixes: b33022a48c79
Signed-off-by: Robert Joslyn <robert_joslyn@...inc.com>
---
 arch/powerpc/kernel/interrupt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/interrupt.c b/arch/powerpc/kernel/interrupt.c
index af62ec974b97..970039af8e92 100644
--- a/arch/powerpc/kernel/interrupt.c
+++ b/arch/powerpc/kernel/interrupt.c
@@ -396,7 +396,7 @@ notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs)
 		/* Returning to a kernel context with local irqs enabled. */
 		WARN_ON_ONCE(!(regs->msr & MSR_EE));
 again:
-		if (IS_ENABLED(CONFIG_PREEMPT)) {
+		if (IS_ENABLED(CONFIG_PREEMPTION)) {
 			/* Return to preemptible kernel context */
 			if (unlikely(read_thread_flags() & _TIF_NEED_RESCHED)) {
 				if (preempt_count() == 0)
-- 
2.45.2