[PATCH 4.9 2/2] provide arch_test_bit_acquire for architectures that define test_bit - Linux-stable-mirror

27 Oct 2022

commit d6ffe6067a54972564552ea45d320fb98db1ac5e upstream.
Some architectures define their own arch_test_bit and they also need
arch_test_bit_acquire, otherwise they won't compile.  We also clean up
the code by using the generic test_bit if that is equivalent to the
arch-specific version.
Signed-off-by: Mikulas Patocka mpatocka@redhat.com
Cc: stable@vger.kernel.org
Fixes: 8238b4579866 ("wait_on_bit: add an acquire memory barrier")
Signed-off-by: Linus Torvalds torvalds@linux-foundation.org
---
 arch/alpha/include/asm/bitops.h   |    7 +++++++
 arch/arc/include/asm/bitops.h     |    7 +++++++
 arch/frv/include/asm/bitops.h     |    7 +++++++
 arch/h8300/include/asm/bitops.h   |    3 ++-
 arch/hexagon/include/asm/bitops.h |   15 +++++++++++++++
 arch/ia64/include/asm/bitops.h    |    7 +++++++
 arch/m68k/include/asm/bitops.h    |    6 ++++++
 arch/mn10300/include/asm/bitops.h |    7 +++++++
 arch/s390/include/asm/bitops.h    |    7 +++++++
 arch/sh/include/asm/bitops-op32.h |    7 +++++++
 10 files changed, 72 insertions(+), 1 deletion(-)
Index: linux-stable/arch/alpha/include/asm/bitops.h
===================================================================

--- linux-stable.orig/arch/alpha/include/asm/bitops.h	2022-10-27 14:24:31.000000000 +0200
+++ linux-stable/arch/alpha/include/asm/bitops.h	2022-10-27 14:24:31.000000000 +0200
@@ -288,6 +288,13 @@ 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	2022-10-27 14:24:31.000000000 +0200
+++ linux-stable/arch/hexagon/include/asm/bitops.h	2022-10-27 14:24:31.000000000 +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	2022-10-27 14:24:31.000000000 +0200
+++ linux-stable/arch/ia64/include/asm/bitops.h	2022-10-27 14:24:31.000000000 +0200
@@ -336,6 +336,13 @@ 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	2022-10-27 14:24:31.000000000 +0200
+++ linux-stable/arch/m68k/include/asm/bitops.h	2022-10-27 14:24:31.000000000 +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	2022-10-27 14:24:31.000000000 +0200
+++ linux-stable/arch/s390/include/asm/bitops.h	2022-10-27 14:24:31.000000000 +0200
@@ -270,6 +270,13 @@ 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	2022-10-27 14:24:31.000000000 +0200
+++ linux-stable/arch/sh/include/asm/bitops-op32.h	2022-10-27 14:24:31.000000000 +0200
@@ -139,4 +139,11 @@ 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 */
Index: linux-stable/arch/arc/include/asm/bitops.h
===================================================================
--- linux-stable.orig/arch/arc/include/asm/bitops.h	2022-10-27 14:24:31.000000000 +0200
+++ linux-stable/arch/arc/include/asm/bitops.h	2022-10-27 14:24:31.000000000 +0200
@@ -254,6 +254,13 @@ test_bit(unsigned int nr, const volatile
    return ((mask & *addr) != 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)));
+}
+
 #ifdef CONFIG_ISA_ARCOMPACT
/*
Index: linux-stable/arch/h8300/include/asm/bitops.h
===================================================================
--- linux-stable.orig/arch/h8300/include/asm/bitops.h	2022-10-27 14:24:31.000000000 +0200
+++ linux-stable/arch/h8300/include/asm/bitops.h	2022-10-27 14:24:31.000000000 +0200
@@ -88,7 +88,8 @@ static inline int test_bit(int nr, const
    return ret;
 }
-#define __test_bit(nr, addr) test_bit(nr, addr)
+#define __test_bit(nr, addr)		test_bit(nr, addr)
+#define test_bit_acquire(nr, addr)	test_bit(nr, addr)
#define H8300_GEN_TEST_BITOP(FNNAME, OP)				\
 static inline int FNNAME(int nr, void *addr)				\
Index: linux-stable/arch/frv/include/asm/bitops.h
===================================================================
--- linux-stable.orig/arch/frv/include/asm/bitops.h	2022-10-27 14:24:31.000000000 +0200
+++ linux-stable/arch/frv/include/asm/bitops.h	2022-10-27 14:24:31.000000000 +0200
@@ -156,6 +156,13 @@ static inline int __test_bit(unsigned lo
  __constant_test_bit((nr),(addr)) : \
  __test_bit((nr),(addr)))
+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)));
+}
+
 #include <asm-generic/bitops/find.h>
/**
Index: linux-stable/arch/mn10300/include/asm/bitops.h
===================================================================
--- linux-stable.orig/arch/mn10300/include/asm/bitops.h	2022-10-27 14:24:31.000000000 +0200
+++ linux-stable/arch/mn10300/include/asm/bitops.h	2022-10-27 14:24:31.000000000 +0200
@@ -73,6 +73,13 @@ static inline int test_bit(unsigned long
    return 1UL & (((const volatile unsigned int *) 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)));
+}
+
 /*
  * change bit
  */

    