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Date:   Tue, 14 Sep 2021 09:17:04 -0700
Message-Id: <20210914161712.2463458-1-ndesaulniers@google.com>
Mime-Version: 1.0
Subject: [PATCH] powerpc: clean up UPD_CONSTR
From:   Nick Desaulniers <ndesaulniers@google.com>
To:     Michael Ellerman <mpe@ellerman.id.au>
Cc:     Nick Desaulniers <ndesaulniers@google.com>,
        Nathan Chancellor <nathan@kernel.org>,
        Christophe Leroy <christophe.leroy@csgroup.eu>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        Will Deacon <will@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Boqun Feng <boqun.feng@gmail.com>,
        Segher Boessenkool <segher@kernel.crashing.org>,
        David Hildenbrand <david@redhat.com>,
        Michal Hocko <mhocko@suse.com>, Daniel Axtens <dja@axtens.net>,
        Dan Williams <dan.j.williams@intel.com>,
        "Christopher M. Riedl" <cmr@codefail.de>,
        linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
        kvm-ppc@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

UPD_CONSTR was previously a preprocessor define for an old GCC 4.9 inline
asm bug with m<> constraints.

Fixes: 6563139d90ad ("powerpc: remove GCC version check for UPD_CONSTR")
Suggested-by: Nathan Chancellor <nathan@kernel.org>
Suggested-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Suggested-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
---
 arch/powerpc/include/asm/asm-const.h | 2 --
 arch/powerpc/include/asm/atomic.h    | 8 ++++----
 arch/powerpc/include/asm/io.h        | 4 ++--
 arch/powerpc/include/asm/uaccess.h   | 6 +++---
 arch/powerpc/kvm/powerpc.c           | 4 ++--
 5 files changed, 11 insertions(+), 13 deletions(-)

diff --git a/arch/powerpc/include/asm/asm-const.h b/arch/powerpc/include/asm/asm-const.h
index dbfa5e1e3198..bfb3c3534877 100644
--- a/arch/powerpc/include/asm/asm-const.h
+++ b/arch/powerpc/include/asm/asm-const.h
@@ -12,6 +12,4 @@
 #  define ASM_CONST(x)		__ASM_CONST(x)
 #endif
 
-#define UPD_CONSTR "<>"
-
 #endif /* _ASM_POWERPC_ASM_CONST_H */
diff --git a/arch/powerpc/include/asm/atomic.h b/arch/powerpc/include/asm/atomic.h
index 6a53ef178bfd..fd594fdbd84d 100644
--- a/arch/powerpc/include/asm/atomic.h
+++ b/arch/powerpc/include/asm/atomic.h
@@ -27,14 +27,14 @@ static __inline__ int arch_atomic_read(const atomic_t *v)
 {
 	int t;
 
-	__asm__ __volatile__("lwz%U1%X1 %0,%1" : "=r"(t) : "m"UPD_CONSTR(v->counter));
+	__asm__ __volatile__("lwz%U1%X1 %0,%1" : "=r"(t) : "m<>"(v->counter));
 
 	return t;
 }
 
 static __inline__ void arch_atomic_set(atomic_t *v, int i)
 {
-	__asm__ __volatile__("stw%U0%X0 %1,%0" : "=m"UPD_CONSTR(v->counter) : "r"(i));
+	__asm__ __volatile__("stw%U0%X0 %1,%0" : "=m<>"(v->counter) : "r"(i));
 }
 
 #define ATOMIC_OP(op, asm_op)						\
@@ -320,14 +320,14 @@ static __inline__ s64 arch_atomic64_read(const atomic64_t *v)
 {
 	s64 t;
 
-	__asm__ __volatile__("ld%U1%X1 %0,%1" : "=r"(t) : "m"UPD_CONSTR(v->counter));
+	__asm__ __volatile__("ld%U1%X1 %0,%1" : "=r"(t) : "m<>"(v->counter));
 
 	return t;
 }
 
 static __inline__ void arch_atomic64_set(atomic64_t *v, s64 i)
 {
-	__asm__ __volatile__("std%U0%X0 %1,%0" : "=m"UPD_CONSTR(v->counter) : "r"(i));
+	__asm__ __volatile__("std%U0%X0 %1,%0" : "=m<>"(v->counter) : "r"(i));
 }
 
 #define ATOMIC64_OP(op, asm_op)						\
diff --git a/arch/powerpc/include/asm/io.h b/arch/powerpc/include/asm/io.h
index f130783c8301..beba4979bff9 100644
--- a/arch/powerpc/include/asm/io.h
+++ b/arch/powerpc/include/asm/io.h
@@ -122,7 +122,7 @@ static inline u##size name(const volatile u##size __iomem *addr)	\
 {									\
 	u##size ret;							\
 	__asm__ __volatile__("sync;"#insn"%U1%X1 %0,%1;twi 0,%0,0;isync"\
-		: "=r" (ret) : "m"UPD_CONSTR (*addr) : "memory");	\
+		: "=r" (ret) : "m<>" (*addr) : "memory");	\
 	return ret;							\
 }
 
@@ -130,7 +130,7 @@ static inline u##size name(const volatile u##size __iomem *addr)	\
 static inline void name(volatile u##size __iomem *addr, u##size val)	\
 {									\
 	__asm__ __volatile__("sync;"#insn"%U0%X0 %1,%0"			\
-		: "=m"UPD_CONSTR (*addr) : "r" (val) : "memory");	\
+		: "=m<>" (*addr) : "r" (val) : "memory");	\
 	mmiowb_set_pending();						\
 }
 
diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h
index 22c79ab40006..63316100080c 100644
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -86,7 +86,7 @@ __pu_failed:							\
 		"1:	" op "%U1%X1 %0,%1	# put_user\n"	\
 		EX_TABLE(1b, %l2)				\
 		:						\
-		: "r" (x), "m"UPD_CONSTR (*addr)		\
+		: "r" (x), "m<>" (*addr)		\
 		:						\
 		: label)
 
@@ -143,7 +143,7 @@ do {								\
 		"1:	"op"%U1%X1 %0, %1	# get_user\n"	\
 		EX_TABLE(1b, %l2)				\
 		: "=r" (x)					\
-		: "m"UPD_CONSTR (*addr)				\
+		: "m<>" (*addr)				\
 		:						\
 		: label)
 
@@ -200,7 +200,7 @@ __gus_failed:								\
 		".previous\n"				\
 		EX_TABLE(1b, 3b)			\
 		: "=r" (err), "=r" (x)			\
-		: "m"UPD_CONSTR (*addr), "i" (-EFAULT), "0" (err))
+		: "m<>" (*addr), "i" (-EFAULT), "0" (err))
 
 #ifdef __powerpc64__
 #define __get_user_asm2(x, addr, err)			\
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index b4e6f70b97b9..3fd037d36afb 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -1094,7 +1094,7 @@ static inline u64 sp_to_dp(u32 fprs)
 
 	preempt_disable();
 	enable_kernel_fp();
-	asm ("lfs%U1%X1 0,%1; stfd%U0%X0 0,%0" : "=m"UPD_CONSTR (fprd) : "m"UPD_CONSTR (fprs)
+	asm ("lfs%U1%X1 0,%1; stfd%U0%X0 0,%0" : "=m<>" (fprd) : "m<>" (fprs)
 	     : "fr0");
 	preempt_enable();
 	return fprd;
@@ -1106,7 +1106,7 @@ static inline u32 dp_to_sp(u64 fprd)
 
 	preempt_disable();
 	enable_kernel_fp();
-	asm ("lfd%U1%X1 0,%1; stfs%U0%X0 0,%0" : "=m"UPD_CONSTR (fprs) : "m"UPD_CONSTR (fprd)
+	asm ("lfd%U1%X1 0,%1; stfs%U0%X0 0,%0" : "=m<>" (fprs) : "m<>" (fprd)
 	     : "fr0");
 	preempt_enable();
 	return fprs;
-- 
2.33.0.309.g3052b89438-goog