linux-kernel - [PATCH] powerpc/32: Restore clearing of MSR[RI] in interrupt_exit_kernel

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Message-ID: <e6166d2568386517de96a89e6cb3c7bd67e71eec.1756723048.git.christophe.leroy@csgroup.eu>
Date: Mon,  1 Sep 2025 12:37:42 +0200
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Michael Ellerman <mpe@...erman.id.au>,
	Nicholas Piggin <npiggin@...il.com>,
	Madhavan Srinivasan <maddy@...ux.ibm.com>
Cc: Christophe Leroy <christophe.leroy@...roup.eu>,
	linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH] powerpc/32: Restore clearing of MSR[RI] in interrupt_exit_kernel_prepare()

Commit 13799748b957 ("powerpc/64: use interrupt restart table to speed
up return from interrupt") removed the inconditional clearing of MSR[RI]
when returning from interrupt into kernel. But powerpc/32 doesn't
implement interrupt restart table hence still need MSR[RI] to be
cleared.

Fixes: 13799748b957 ("powerpc/64: use interrupt restart table to speed up return from interrupt")
Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/powerpc/kernel/interrupt.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/powerpc/kernel/interrupt.c b/arch/powerpc/kernel/interrupt.c
index e0c681d0b076..e63bfde13e03 100644
--- a/arch/powerpc/kernel/interrupt.c
+++ b/arch/powerpc/kernel/interrupt.c
@@ -443,6 +443,9 @@ notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs)
 
 		if (unlikely(stack_store))
 			__hard_EE_RI_disable();
+#else
+	} else {
+		__hard_EE_RI_disable();
 #endif /* CONFIG_PPC64 */
 	}
 
-- 
2.49.0