linux-kernel - [PATCH 2/2] powerpc/irq64: Remove get_irq

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Message-Id: <af511b53e4eb51f8fbc51eda7f5597175e68dce6.1652859593.git.christophe.leroy@csgroup.eu>
Date:   Wed, 18 May 2022 09:40:16 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH 2/2] powerpc/irq64: Remove get_irq_happened()

No need to open code the read of local_paca->irq_happened in
assembly, we have READ_ONCE() for doing the same.

Replace get_irq_happened() by READ_ONCE(local_paca->irq_happened).

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/powerpc/kernel/irq_64.c | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/arch/powerpc/kernel/irq_64.c b/arch/powerpc/kernel/irq_64.c
index 488f6eb4553d..0f0e8bcb368c 100644
--- a/arch/powerpc/kernel/irq_64.c
+++ b/arch/powerpc/kernel/irq_64.c
@@ -67,16 +67,6 @@
 
 int distribute_irqs = 1;
 
-static inline notrace unsigned long get_irq_happened(void)
-{
-	unsigned long happened;
-
-	__asm__ __volatile__("lbz %0,%1(13)"
-	: "=r" (happened) : "i" (offsetof(struct paca_struct, irq_happened)));
-
-	return happened;
-}
-
 void replay_soft_interrupts(void)
 {
 	struct pt_regs regs;
@@ -233,7 +223,7 @@ notrace void arch_local_irq_restore(unsigned long mask)
 	return;
 
 happened:
-	irq_happened = get_irq_happened();
+	irq_happened = READ_ONCE(local_paca->irq_happened);
 	if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG))
 		WARN_ON_ONCE(!irq_happened);
 
@@ -256,7 +246,7 @@ notrace void arch_local_irq_restore(unsigned long mask)
 				 * IRQ_HARD_DIS again and warn if it is still
 				 * clear.
 				 */
-				irq_happened = get_irq_happened();
+				irq_happened = READ_ONCE(local_paca->irq_happened);
 				WARN_ON_ONCE(!(irq_happened & PACA_IRQ_HARD_DIS));
 			}
 		}
-- 
2.35.3