[PATCH v2 01/36] MIPS: Unify sc beqz definition

From: Paul Burton
Date: Tue Oct 01 2019 - 17:53:15 EST

We currently duplicate the definition of __scbeqz in asm/atomic.h &
asm/cmpxchg.h. Move it to asm/llsc.h & rename it to __SC_BEQZ to fit
better with the existing __SC macro provided there.

We include a tab in the string in order to avoid the need for users to
indent code any further to include whitespace of their own after the
instruction mnemonic.

Signed-off-by: Paul Burton <paul.burton@xxxxxxxx>
---

Changes in v2: None

arch/mips/include/asm/atomic.h | 28 +++++++++-------------------
arch/mips/include/asm/cmpxchg.h | 20 ++++----------------
arch/mips/include/asm/llsc.h | 11 +++++++++++
3 files changed, 24 insertions(+), 35 deletions(-)

diff --git a/arch/mips/include/asm/atomic.h b/arch/mips/include/asm/atomic.h
index bb8658cc7f12..7578c807ef98 100644
--- a/arch/mips/include/asm/atomic.h
+++ b/arch/mips/include/asm/atomic.h
@@ -20,19 +20,9 @@
#include <asm/compiler.h>
#include <asm/cpu-features.h>
#include <asm/cmpxchg.h>
+#include <asm/llsc.h>
#include <asm/war.h>

-/*
- * Using a branch-likely instruction to check the result of an sc instruction
- * works around a bug present in R10000 CPUs prior to revision 3.0 that could
- * cause ll-sc sequences to execute non-atomically.
- */
-#if R10000_LLSC_WAR
-# define __scbeqz "beqzl"
-#else
-# define __scbeqz "beqz"
-#endif
-
#define ATOMIC_INIT(i) { (i) }

/*
@@ -65,7 +55,7 @@ static __inline__ void atomic_##op(int i, atomic_t * v) \
"1: ll %0, %1 # atomic_" #op " \n" \
" " #asm_op " %0, %2 \n" \
" sc %0, %1 \n" \
- "\t" __scbeqz " %0, 1b \n" \
+ "\t" __SC_BEQZ "%0, 1b \n" \
" .set pop \n" \
: "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (v->counter) \
: "Ir" (i) : __LLSC_CLOBBER); \
@@ -93,7 +83,7 @@ static __inline__ int atomic_##op##_return_relaxed(int i, atomic_t * v) \
"1: ll %1, %2 # atomic_" #op "_return \n" \
" " #asm_op " %0, %1, %3 \n" \
" sc %0, %2 \n" \
- "\t" __scbeqz " %0, 1b \n" \
+ "\t" __SC_BEQZ "%0, 1b \n" \
" " #asm_op " %0, %1, %3 \n" \
" .set pop \n" \
: "=&r" (result), "=&r" (temp), \
@@ -127,7 +117,7 @@ static __inline__ int atomic_fetch_##op##_relaxed(int i, atomic_t * v) \
"1: ll %1, %2 # atomic_fetch_" #op " \n" \
" " #asm_op " %0, %1, %3 \n" \
" sc %0, %2 \n" \
- "\t" __scbeqz " %0, 1b \n" \
+ "\t" __SC_BEQZ "%0, 1b \n" \
" .set pop \n" \
" move %0, %1 \n" \
: "=&r" (result), "=&r" (temp), \
@@ -205,7 +195,7 @@ static __inline__ int atomic_sub_if_positive(int i, atomic_t * v)
" .set push \n"
" .set "MIPS_ISA_LEVEL" \n"
" sc %1, %2 \n"
- "\t" __scbeqz " %1, 1b \n"
+ "\t" __SC_BEQZ "%1, 1b \n"
"2: \n"
" .set pop \n"
: "=&r" (result), "=&r" (temp),
@@ -267,7 +257,7 @@ static __inline__ void atomic64_##op(s64 i, atomic64_t * v) \
"1: lld %0, %1 # atomic64_" #op " \n" \
" " #asm_op " %0, %2 \n" \
" scd %0, %1 \n" \
- "\t" __scbeqz " %0, 1b \n" \
+ "\t" __SC_BEQZ "%0, 1b \n" \
" .set pop \n" \
: "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (v->counter) \
: "Ir" (i) : __LLSC_CLOBBER); \
@@ -295,7 +285,7 @@ static __inline__ s64 atomic64_##op##_return_relaxed(s64 i, atomic64_t * v) \
"1: lld %1, %2 # atomic64_" #op "_return\n" \
" " #asm_op " %0, %1, %3 \n" \
" scd %0, %2 \n" \
- "\t" __scbeqz " %0, 1b \n" \
+ "\t" __SC_BEQZ "%0, 1b \n" \
" " #asm_op " %0, %1, %3 \n" \
" .set pop \n" \
: "=&r" (result), "=&r" (temp), \
@@ -329,7 +319,7 @@ static __inline__ s64 atomic64_fetch_##op##_relaxed(s64 i, atomic64_t * v) \
"1: lld %1, %2 # atomic64_fetch_" #op "\n" \
" " #asm_op " %0, %1, %3 \n" \
" scd %0, %2 \n" \
- "\t" __scbeqz " %0, 1b \n" \
+ "\t" __SC_BEQZ "%0, 1b \n" \
" move %0, %1 \n" \
" .set pop \n" \
: "=&r" (result), "=&r" (temp), \
@@ -404,7 +394,7 @@ static __inline__ s64 atomic64_sub_if_positive(s64 i, atomic64_t * v)
" move %1, %0 \n"
" bltz %0, 1f \n"
" scd %1, %2 \n"
- "\t" __scbeqz " %1, 1b \n"
+ "\t" __SC_BEQZ "%1, 1b \n"
"1: \n"
" .set pop \n"
: "=&r" (result), "=&r" (temp),
diff --git a/arch/mips/include/asm/cmpxchg.h b/arch/mips/include/asm/cmpxchg.h
index 79bf34efbc04..5d3f0e3513b4 100644
--- a/arch/mips/include/asm/cmpxchg.h
+++ b/arch/mips/include/asm/cmpxchg.h
@@ -11,19 +11,9 @@
#include <linux/bug.h>
#include <linux/irqflags.h>
#include <asm/compiler.h>
+#include <asm/llsc.h>
#include <asm/war.h>

-/*
- * Using a branch-likely instruction to check the result of an sc instruction
- * works around a bug present in R10000 CPUs prior to revision 3.0 that could
- * cause ll-sc sequences to execute non-atomically.
- */
-#if R10000_LLSC_WAR
-# define __scbeqz "beqzl"
-#else
-# define __scbeqz "beqz"
-#endif
-
/*
* These functions doesn't exist, so if they are called you'll either:
*
@@ -57,7 +47,7 @@ extern unsigned long __xchg_called_with_bad_pointer(void)
" move $1, %z3 \n" \
" .set " MIPS_ISA_ARCH_LEVEL " \n" \
" " st " $1, %1 \n" \
- "\t" __scbeqz " $1, 1b \n" \
+ "\t" __SC_BEQZ "$1, 1b \n" \
" .set pop \n" \
: "=&r" (__ret), "=" GCC_OFF_SMALL_ASM() (*m) \
: GCC_OFF_SMALL_ASM() (*m), "Jr" (val) \
@@ -130,7 +120,7 @@ static inline unsigned long __xchg(volatile void *ptr, unsigned long x,
" move $1, %z4 \n" \
" .set "MIPS_ISA_ARCH_LEVEL" \n" \
" " st " $1, %1 \n" \
- "\t" __scbeqz " $1, 1b \n" \
+ "\t" __SC_BEQZ "$1, 1b \n" \
" .set pop \n" \
"2: \n" \
: "=&r" (__ret), "=" GCC_OFF_SMALL_ASM() (*m) \
@@ -268,7 +258,7 @@ static inline unsigned long __cmpxchg64(volatile void *ptr,
/* Attempt to store new at ptr */
" scd %L1, %2 \n"
/* If we failed, loop! */
- "\t" __scbeqz " %L1, 1b \n"
+ "\t" __SC_BEQZ "%L1, 1b \n"
" .set pop \n"
"2: \n"
: "=&r"(ret),
@@ -311,6 +301,4 @@ static inline unsigned long __cmpxchg64(volatile void *ptr,
# endif /* !CONFIG_SMP */
#endif /* !CONFIG_64BIT */

-#undef __scbeqz
-
#endif /* __ASM_CMPXCHG_H */
diff --git a/arch/mips/include/asm/llsc.h b/arch/mips/include/asm/llsc.h
index c6d17d171147..9b19f38562ac 100644
--- a/arch/mips/include/asm/llsc.h
+++ b/arch/mips/include/asm/llsc.h
@@ -25,4 +25,15 @@
#define __EXT "dext "
#endif

+/*
+ * Using a branch-likely instruction to check the result of an sc instruction
+ * works around a bug present in R10000 CPUs prior to revision 3.0 that could
+ * cause ll-sc sequences to execute non-atomically.
+ */
+#if R10000_LLSC_WAR
+# define __SC_BEQZ "beqzl "
+#else
+# define __SC_BEQZ "beqz "
+#endif
+
#endif /* __ASM_LLSC_H */
--
2.23.0