[PATCH] provide arch_test_bit_acquire for architectures that define test_bit

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This is backport of the upstream patch d6ffe6067a54972564552ea45d320fb98db1ac5e
for the stable branch 4.19

Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>

---
 arch/alpha/include/asm/bitops.h   |    7 +++++++
 arch/hexagon/include/asm/bitops.h |   15 +++++++++++++++
 arch/ia64/include/asm/bitops.h    |    7 +++++++
 arch/m68k/include/asm/bitops.h    |    6 ++++++
 arch/s390/include/asm/bitops.h    |    7 +++++++
 arch/sh/include/asm/bitops-op32.h |    7 +++++++
 6 files changed, 49 insertions(+)

Index: linux-stable/arch/alpha/include/asm/bitops.h
===================================================================
--- linux-stable.orig/arch/alpha/include/asm/bitops.h	2022-09-30 15:48:24.000000000 +0200
+++ linux-stable/arch/alpha/include/asm/bitops.h	2022-09-30 15:48:24.000000000 +0200
@@ -289,6 +289,13 @@ test_bit(int nr, const volatile void * a
 	return (1UL & (((const int *) addr)[nr >> 5] >> (nr & 31))) != 0UL;
 }
 
+static __always_inline bool
+test_bit_acquire(unsigned long nr, const volatile unsigned long *addr)
+{
+	unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
+	return 1UL & (smp_load_acquire(p) >> (nr & (BITS_PER_LONG-1)));
+}
+
 /*
  * ffz = Find First Zero in word. Undefined if no zero exists,
  * so code should check against ~0UL first..
Index: linux-stable/arch/hexagon/include/asm/bitops.h
===================================================================
--- linux-stable.orig/arch/hexagon/include/asm/bitops.h	2022-09-30 15:48:24.000000000 +0200
+++ linux-stable/arch/hexagon/include/asm/bitops.h	2022-09-30 15:48:24.000000000 +0200
@@ -186,7 +186,22 @@ static inline int __test_bit(int nr, con
 	return retval;
 }
 
+static inline int __test_bit_acquire(int nr, const volatile unsigned long *addr)
+{
+	int retval;
+
+	asm volatile(
+	"{P0 = tstbit(%1,%2); if (P0.new) %0 = #1; if (!P0.new) %0 = #0;}\n"
+	: "=&r" (retval)
+	: "r" (addr[BIT_WORD(nr)]), "r" (nr % BITS_PER_LONG)
+	: "p0", "memory"
+	);
+
+	return retval;
+}
+
 #define test_bit(nr, addr) __test_bit(nr, addr)
+#define test_bit_acquire(nr, addr) __test_bit_acquire(nr, addr)
 
 /*
  * ffz - find first zero in word.
Index: linux-stable/arch/ia64/include/asm/bitops.h
===================================================================
--- linux-stable.orig/arch/ia64/include/asm/bitops.h	2022-09-30 15:48:24.000000000 +0200
+++ linux-stable/arch/ia64/include/asm/bitops.h	2022-09-30 15:48:24.000000000 +0200
@@ -337,6 +337,13 @@ test_bit (int nr, const volatile void *a
 	return 1 & (((const volatile __u32 *) addr)[nr >> 5] >> (nr & 31));
 }
 
+static __always_inline bool
+test_bit_acquire(unsigned long nr, const volatile unsigned long *addr)
+{
+	unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
+	return 1UL & (smp_load_acquire(p) >> (nr & (BITS_PER_LONG-1)));
+}
+
 /**
  * ffz - find the first zero bit in a long word
  * @x: The long word to find the bit in
Index: linux-stable/arch/m68k/include/asm/bitops.h
===================================================================
--- linux-stable.orig/arch/m68k/include/asm/bitops.h	2022-09-30 15:48:24.000000000 +0200
+++ linux-stable/arch/m68k/include/asm/bitops.h	2022-09-30 15:48:24.000000000 +0200
@@ -153,6 +153,12 @@ static inline int test_bit(int nr, const
 	return (vaddr[nr >> 5] & (1UL << (nr & 31))) != 0;
 }
 
+static __always_inline bool
+test_bit_acquire(unsigned long nr, const volatile unsigned long *addr)
+{
+	unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
+	return 1UL & (smp_load_acquire(p) >> (nr & (BITS_PER_LONG-1)));
+}
 
 static inline int bset_reg_test_and_set_bit(int nr,
 					    volatile unsigned long *vaddr)
Index: linux-stable/arch/s390/include/asm/bitops.h
===================================================================
--- linux-stable.orig/arch/s390/include/asm/bitops.h	2022-09-30 15:48:24.000000000 +0200
+++ linux-stable/arch/s390/include/asm/bitops.h	2022-09-30 15:49:53.000000000 +0200
@@ -215,6 +215,13 @@ static inline int test_bit(unsigned long
 	return (*addr >> (nr & 7)) & 1;
 }
 
+static __always_inline bool
+test_bit_acquire(unsigned long nr, const volatile unsigned long *addr)
+{
+	unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
+	return 1UL & (smp_load_acquire(p) >> (nr & (BITS_PER_LONG-1)));
+}
+
 static inline int test_and_set_bit_lock(unsigned long nr,
 					volatile unsigned long *ptr)
 {
Index: linux-stable/arch/sh/include/asm/bitops-op32.h
===================================================================
--- linux-stable.orig/arch/sh/include/asm/bitops-op32.h	2022-09-30 15:48:24.000000000 +0200
+++ linux-stable/arch/sh/include/asm/bitops-op32.h	2022-09-30 15:48:24.000000000 +0200
@@ -140,4 +140,11 @@ static inline int test_bit(int nr, const
 	return 1UL & (addr[BIT_WORD(nr)] >> (nr & (BITS_PER_LONG-1)));
 }
 
+static __always_inline bool
+test_bit_acquire(unsigned long nr, const volatile unsigned long *addr)
+{
+	unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
+	return 1UL & (smp_load_acquire(p) >> (nr & (BITS_PER_LONG-1)));
+}
+
 #endif /* __ASM_SH_BITOPS_OP32_H */




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