linux-kernel - [PATCH] powerpc/8xx: Remove specific code from fast_exception

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Message-ID: <39de3e0f0122b571474b1ba352a2dc3ad8cb71dd.1756304318.git.christophe.leroy@csgroup.eu>
Date: Wed, 27 Aug 2025 16:18:53 +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/8xx: Remove specific code from fast_exception_return

The label 2: in fast_exception_return is a leftover from
commit b96bae3ae2cb ("powerpc/32: Replace ASM exception exit by C
exception exit from ppc64"). Once removed, we see that
fast_exception_return is a standalone function that is called only
from pieces of assembly dedicated to book3s/32 or booke, never by
common code or 8xx code.

So remove the clear of MSR[RI] enclosed in #ifdef CONFIG_PPC_8xx.

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/powerpc/kernel/entry_32.S | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index f4a8c9877249..762df811433c 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -216,7 +216,7 @@ fast_exception_return:
 	beq	3f			/* if not, we've got problems */
 #endif
 
-2:	lwz	r10,_CCR(r11)
+	lwz	r10,_CCR(r11)
 	REST_GPRS(1, 6, r11)
 	mtcr	r10
 	lwz	r10,_LINK(r11)
@@ -225,9 +225,6 @@ fast_exception_return:
 	li	r10, 0
 	stw	r10, 8(r11)
 	REST_GPR(10, r11)
-#if defined(CONFIG_PPC_8xx) && defined(CONFIG_PERF_EVENTS)
-	mtspr	SPRN_NRI, r0
-#endif
 	mtspr	SPRN_SRR1,r9
 	mtspr	SPRN_SRR0,r12
 	REST_GPR(9, r11)
-- 
2.49.0