linux-kernel - [PATCH v2 2/2] powerpc: cleanup hw

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Message-Id: <97c95772ccf4a1fc5fc092c664996d08efca3d73.1566931178.git.christophe.leroy@c-s.fr>
Date:   Tue, 27 Aug 2019 18:39:50 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        segher@...nel.crashing.org, npiggin@...il.com
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v2 2/2] powerpc: cleanup hw_irq.h

SET_MSR_EE() is just use in this file and doesn't provide
any added value compared to mtmsr(). Drop it.

Add a wrtee() inline function to use wrtee/wrteei insn.

Replace #ifdefs by IS_ENABLED()

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>

---
v2: Changed wrtee()/wrteei() to a single wrtee() inline which uses wrtee
    or wrteei depending on the constness of the argument (Nick's idea).
---
 arch/powerpc/include/asm/hw_irq.h | 57 ++++++++++++++++++---------------------
 arch/powerpc/include/asm/reg.h    |  8 ++++++
 2 files changed, 34 insertions(+), 31 deletions(-)

diff --git a/arch/powerpc/include/asm/hw_irq.h b/arch/powerpc/include/asm/hw_irq.h
index 32a18f2f49bc..e3a905e3d573 100644
--- a/arch/powerpc/include/asm/hw_irq.h
+++ b/arch/powerpc/include/asm/hw_irq.h
@@ -226,8 +226,8 @@ static inline bool arch_irqs_disabled(void)
 #endif /* CONFIG_PPC_BOOK3S */
 
 #ifdef CONFIG_PPC_BOOK3E
-#define __hard_irq_enable()	asm volatile("wrteei 1" : : : "memory")
-#define __hard_irq_disable()	asm volatile("wrteei 0" : : : "memory")
+#define __hard_irq_enable()	wrtee(MSR_EE)
+#define __hard_irq_disable()	wrtee(0)
 #else
 #define __hard_irq_enable()	__mtmsrd(MSR_EE|MSR_RI, 1)
 #define __hard_irq_disable()	__mtmsrd(MSR_RI, 1)
@@ -280,8 +280,6 @@ extern void force_external_irq_replay(void);
 
 #else /* CONFIG_PPC64 */
 
-#define SET_MSR_EE(x)	mtmsr(x)
-
 static inline unsigned long arch_local_save_flags(void)
 {
 	return mfmsr();
@@ -289,47 +287,44 @@ static inline unsigned long arch_local_save_flags(void)
 
 static inline void arch_local_irq_restore(unsigned long flags)
 {
-#if defined(CONFIG_BOOKE)
-	asm volatile("wrtee %0" : : "r" (flags) : "memory");
-#else
-	mtmsr(flags);
-#endif
+	if (IS_ENABLED(CONFIG_BOOKE))
+		wrtee(flags);
+	else
+		mtmsr(flags);
 }
 
 static inline unsigned long arch_local_irq_save(void)
 {
 	unsigned long flags = arch_local_save_flags();
-#ifdef CONFIG_BOOKE
-	asm volatile("wrteei 0" : : : "memory");
-#elif defined(CONFIG_PPC_8xx)
-	wrtspr(SPRN_EID);
-#else
-	SET_MSR_EE(flags & ~MSR_EE);
-#endif
+
+	if (IS_ENABLED(CONFIG_BOOKE))
+		wrtee(0);
+	else if (IS_ENABLED(CONFIG_PPC_8xx))
+		wrtspr(SPRN_EID);
+	else
+		mtmsr(flags & ~MSR_EE);
+
 	return flags;
 }
 
 static inline void arch_local_irq_disable(void)
 {
-#ifdef CONFIG_BOOKE
-	asm volatile("wrteei 0" : : : "memory");
-#elif defined(CONFIG_PPC_8xx)
-	wrtspr(SPRN_EID);
-#else
-	arch_local_irq_save();
-#endif
+	if (IS_ENABLED(CONFIG_BOOKE))
+		wrtee(0);
+	else if (IS_ENABLED(CONFIG_PPC_8xx))
+		wrtspr(SPRN_EID);
+	else
+		mtmsr(mfmsr() & ~MSR_EE);
 }
 
 static inline void arch_local_irq_enable(void)
 {
-#ifdef CONFIG_BOOKE
-	asm volatile("wrteei 1" : : : "memory");
-#elif defined(CONFIG_PPC_8xx)
-	wrtspr(SPRN_EIE);
-#else
-	unsigned long msr = mfmsr();
-	SET_MSR_EE(msr | MSR_EE);
-#endif
+	if (IS_ENABLED(CONFIG_BOOKE))
+		wrtee(MSR_EE);
+	else if (IS_ENABLED(CONFIG_PPC_8xx))
+		wrtspr(SPRN_EIE);
+	else
+		mtmsr(mfmsr() | MSR_EE);
 }
 
 static inline bool arch_irqs_disabled_flags(unsigned long flags)
diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index b17ee25df226..a18e629d9951 100644
--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -1362,6 +1362,14 @@ static inline void mtmsr_isync(unsigned long val)
 #define wrtspr(rn)	asm volatile("mtspr " __stringify(rn) ",0" : \
 				     : : "memory")
 
+static inline void wrtee(unsigned long val)
+{
+	if (__builtin_constant_p(val))
+		asm volatile("wrteei %0" : : "i" ((val & MSR_EE) ? 1 : 0) : "memory");
+	else
+		asm volatile("wrtee %0" : : "r" (val) : "memory");
+}
+
 extern unsigned long msr_check_and_set(unsigned long bits);
 extern bool strict_msr_control;
 extern void __msr_check_and_clear(unsigned long bits);
-- 
2.13.3