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Date:   Mon, 6 Jun 2022 17:27:16 +0100
From:   Mark Rutland <mark.rutland@arm.com>
To:     Alexander Lobakin <alexandr.lobakin@intel.com>
Cc:     Arnd Bergmann <arnd@arndb.de>, Yury Norov <yury.norov@gmail.com>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Richard Henderson <rth@twiddle.net>,
        Matt Turner <mattst88@gmail.com>,
        Brian Cain <bcain@quicinc.com>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Yoshinori Sato <ysato@users.sourceforge.jp>,
        Rich Felker <dalias@libc.org>,
        "David S. Miller" <davem@davemloft.net>,
        Kees Cook <keescook@chromium.org>,
        "Peter Zijlstra (Intel)" <peterz@infradead.org>,
        Marco Elver <elver@google.com>, Borislav Petkov <bp@suse.de>,
        Tony Luck <tony.luck@intel.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-alpha@vger.kernel.org, linux-hexagon@vger.kernel.org,
        linux-ia64@vger.kernel.org, linux-m68k@lists.linux-m68k.org,
        linux-sh@vger.kernel.org, sparclinux@vger.kernel.org,
        linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 5/6] bitops: wrap non-atomic bitops with a transparent
 macro
Message-ID: <Yp4q5KlIxmlznvuh@FVFF77S0Q05N.cambridge.arm.com>
References: <20220606114908.962562-1-alexandr.lobakin@intel.com>
 <20220606114908.962562-6-alexandr.lobakin@intel.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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In-Reply-To: <20220606114908.962562-6-alexandr.lobakin@intel.com>
Precedence: bulk

On Mon, Jun 06, 2022 at 01:49:06PM +0200, Alexander Lobakin wrote:
> In preparation for altering the non-atomic bitops with a macro, wrap
> them in a transparent definition. This requires prepending one more
> '_' to their names in order to be able to do that seamlessly.
> sparc32 already has the triple-underscored functions, so I had to
> rename them ('___' -> 'sp32_').

Could we use an 'arch_' prefix here, like we do for the atomics, or is that
already overloaded?

Thanks,
Mark.

> 
> Signed-off-by: Alexander Lobakin <alexandr.lobakin@intel.com>
> ---
>  arch/alpha/include/asm/bitops.h               | 14 ++++----
>  arch/hexagon/include/asm/bitops.h             | 16 +++++-----
>  arch/ia64/include/asm/bitops.h                | 26 +++++++--------
>  arch/m68k/include/asm/bitops.h                | 14 ++++----
>  arch/sh/include/asm/bitops-op32.h             | 22 ++++++-------
>  arch/sparc/include/asm/bitops_32.h            | 18 +++++------
>  arch/sparc/lib/atomic32.c                     | 12 +++----
>  .../bitops/instrumented-non-atomic.h          | 28 ++++++++--------
>  include/asm-generic/bitops/non-atomic.h       | 14 ++++----
>  include/linux/bitops.h                        | 32 ++++++++++++++-----
>  tools/include/asm-generic/bitops/non-atomic.h | 24 +++++++-------
>  tools/include/linux/bitops.h                  | 16 ++++++++++
>  12 files changed, 134 insertions(+), 102 deletions(-)
> 
> diff --git a/arch/alpha/include/asm/bitops.h b/arch/alpha/include/asm/bitops.h
> index 381ad2eae4b4..e7d119826062 100644
> --- a/arch/alpha/include/asm/bitops.h
> +++ b/arch/alpha/include/asm/bitops.h
> @@ -47,7 +47,7 @@ set_bit(unsigned long nr, volatile void * addr)
>   * WARNING: non atomic version.
>   */
>  static __always_inline void
> -__set_bit(unsigned long nr, volatile unsigned long *addr)
> +___set_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	int *m = ((int *) addr) + (nr >> 5);
>  
> @@ -83,7 +83,7 @@ clear_bit_unlock(unsigned long nr, volatile void * addr)
>   * WARNING: non atomic version.
>   */
>  static __always_inline void
> -__clear_bit(unsigned long nr, volatile unsigned long *addr)
> +___clear_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	int *m = ((int *) addr) + (nr >> 5);
>  
> @@ -119,7 +119,7 @@ change_bit(unsigned long nr, volatile void * addr)
>   * WARNING: non atomic version.
>   */
>  static __always_inline void
> -__change_bit(unsigned long nr, volatile unsigned long *addr)
> +___change_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	int *m = ((int *) addr) + (nr >> 5);
>  
> @@ -187,7 +187,7 @@ test_and_set_bit_lock(unsigned long nr, volatile void *addr)
>   * WARNING: non atomic version.
>   */
>  static __always_inline bool
> -__test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
> +___test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	unsigned long mask = 1 << (nr & 0x1f);
>  	int *m = ((int *) addr) + (nr >> 5);
> @@ -231,7 +231,7 @@ test_and_clear_bit(unsigned long nr, volatile void * addr)
>   * WARNING: non atomic version.
>   */
>  static __always_inline bool
> -__test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
> +___test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	unsigned long mask = 1 << (nr & 0x1f);
>  	int *m = ((int *) addr) + (nr >> 5);
> @@ -273,7 +273,7 @@ test_and_change_bit(unsigned long nr, volatile void * addr)
>   * WARNING: non atomic version.
>   */
>  static __always_inline bool
> -__test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
> +___test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	unsigned long mask = 1 << (nr & 0x1f);
>  	int *m = ((int *) addr) + (nr >> 5);
> @@ -284,7 +284,7 @@ __test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
>  }
>  
>  static __always_inline bool
> -test_bit(unsigned long nr, const volatile unsigned long *addr)
> +_test_bit(unsigned long nr, const volatile unsigned long *addr)
>  {
>  	return (1UL & (((const int *) addr)[nr >> 5] >> (nr & 31))) != 0UL;
>  }
> diff --git a/arch/hexagon/include/asm/bitops.h b/arch/hexagon/include/asm/bitops.h
> index a3bfe3a8d4b7..37144f8e0b0c 100644
> --- a/arch/hexagon/include/asm/bitops.h
> +++ b/arch/hexagon/include/asm/bitops.h
> @@ -128,44 +128,44 @@ static inline void change_bit(int nr, volatile void *addr)
>   *
>   */
>  static __always_inline void
> -__clear_bit(unsigned long nr, volatile unsigned long *addr)
> +___clear_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	test_and_clear_bit(nr, addr);
>  }
>  
>  static __always_inline void
> -__set_bit(unsigned long nr, volatile unsigned long *addr)
> +___set_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	test_and_set_bit(nr, addr);
>  }
>  
>  static __always_inline void
> -__change_bit(unsigned long nr, volatile unsigned long *addr)
> +___change_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	test_and_change_bit(nr, addr);
>  }
>  
>  /*  Apparently, at least some of these are allowed to be non-atomic  */
>  static __always_inline bool
> -__test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
> +___test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	return test_and_clear_bit(nr, addr);
>  }
>  
>  static __always_inline bool
> -__test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
> +___test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	return test_and_set_bit(nr, addr);
>  }
>  
>  static __always_inline bool
> -__test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
> +___test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	return test_and_change_bit(nr, addr);
>  }
>  
>  static __always_inline bool
> -test_bit(unsigned long nr, const volatile unsigned long *addr)
> +_test_bit(unsigned long nr, const volatile unsigned long *addr)
>  {
>  	int retval;
>  
> @@ -179,7 +179,7 @@ test_bit(unsigned long nr, const volatile unsigned long *addr)
>  	return retval;
>  }
>  
> -#define __test_bit(nr, addr) test_bit(nr, addr)
> +#define __test_bit(nr, addr) _test_bit(nr, addr)
>  
>  /*
>   * ffz - find first zero in word.
> diff --git a/arch/ia64/include/asm/bitops.h b/arch/ia64/include/asm/bitops.h
> index 4267a217a503..3cb231fb0283 100644
> --- a/arch/ia64/include/asm/bitops.h
> +++ b/arch/ia64/include/asm/bitops.h
> @@ -53,7 +53,7 @@ set_bit (int nr, volatile void *addr)
>  }
>  
>  /**
> - * __set_bit - Set a bit in memory
> + * ___set_bit - Set a bit in memory
>   * @nr: the bit to set
>   * @addr: the address to start counting from
>   *
> @@ -62,7 +62,7 @@ set_bit (int nr, volatile void *addr)
>   * may be that only one operation succeeds.
>   */
>  static __always_inline void
> -__set_bit(unsigned long nr, volatile unsigned long *addr)
> +___set_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	*((__u32 *) addr + (nr >> 5)) |= (1 << (nr & 31));
>  }
> @@ -135,7 +135,7 @@ __clear_bit_unlock(int nr, void *addr)
>  }
>  
>  /**
> - * __clear_bit - Clears a bit in memory (non-atomic version)
> + * ___clear_bit - Clears a bit in memory (non-atomic version)
>   * @nr: the bit to clear
>   * @addr: the address to start counting from
>   *
> @@ -144,7 +144,7 @@ __clear_bit_unlock(int nr, void *addr)
>   * may be that only one operation succeeds.
>   */
>  static __always_inline void
> -__clear_bit(unsigned long nr, volatile unsigned long *addr)
> +___clear_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	*((__u32 *) addr + (nr >> 5)) &= ~(1 << (nr & 31));
>  }
> @@ -175,7 +175,7 @@ change_bit (int nr, volatile void *addr)
>  }
>  
>  /**
> - * __change_bit - Toggle a bit in memory
> + * ___change_bit - Toggle a bit in memory
>   * @nr: the bit to toggle
>   * @addr: the address to start counting from
>   *
> @@ -184,7 +184,7 @@ change_bit (int nr, volatile void *addr)
>   * may be that only one operation succeeds.
>   */
>  static __always_inline void
> -__change_bit(unsigned long nr, volatile unsigned long *addr)
> +___change_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	*((__u32 *) addr + (nr >> 5)) ^= (1 << (nr & 31));
>  }
> @@ -224,7 +224,7 @@ test_and_set_bit (int nr, volatile void *addr)
>  #define test_and_set_bit_lock test_and_set_bit
>  
>  /**
> - * __test_and_set_bit - Set a bit and return its old value
> + * ___test_and_set_bit - Set a bit and return its old value
>   * @nr: Bit to set
>   * @addr: Address to count from
>   *
> @@ -233,7 +233,7 @@ test_and_set_bit (int nr, volatile void *addr)
>   * but actually fail.  You must protect multiple accesses with a lock.
>   */
>  static __always_inline bool
> -__test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
> +___test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	__u32 *p = (__u32 *) addr + (nr >> 5);
>  	__u32 m = 1 << (nr & 31);
> @@ -269,7 +269,7 @@ test_and_clear_bit (int nr, volatile void *addr)
>  }
>  
>  /**
> - * __test_and_clear_bit - Clear a bit and return its old value
> + * ___test_and_clear_bit - Clear a bit and return its old value
>   * @nr: Bit to clear
>   * @addr: Address to count from
>   *
> @@ -278,7 +278,7 @@ test_and_clear_bit (int nr, volatile void *addr)
>   * but actually fail.  You must protect multiple accesses with a lock.
>   */
>  static __always_inline bool
> -__test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
> +___test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	__u32 *p = (__u32 *) addr + (nr >> 5);
>  	__u32 m = 1 << (nr & 31);
> @@ -314,14 +314,14 @@ test_and_change_bit (int nr, volatile void *addr)
>  }
>  
>  /**
> - * __test_and_change_bit - Change a bit and return its old value
> + * ___test_and_change_bit - Change a bit and return its old value
>   * @nr: Bit to change
>   * @addr: Address to count from
>   *
>   * This operation is non-atomic and can be reordered.
>   */
>  static __always_inline bool
> -__test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
> +___test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	__u32 old, bit = (1 << (nr & 31));
>  	__u32 *m = (__u32 *) addr + (nr >> 5);
> @@ -332,7 +332,7 @@ __test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
>  }
>  
>  static __always_inline bool
> -test_bit(unsigned long nr, const volatile unsigned long *addr)
> +_test_bit(unsigned long nr, const volatile unsigned long *addr)
>  {
>  	return 1 & (((const volatile __u32 *) addr)[nr >> 5] >> (nr & 31));
>  }
> diff --git a/arch/m68k/include/asm/bitops.h b/arch/m68k/include/asm/bitops.h
> index 9d44bd4713cb..ed08c9d9c547 100644
> --- a/arch/m68k/include/asm/bitops.h
> +++ b/arch/m68k/include/asm/bitops.h
> @@ -66,7 +66,7 @@ static inline void bfset_mem_set_bit(int nr, volatile unsigned long *vaddr)
>  #endif
>  
>  static __always_inline void
> -__set_bit(unsigned long nr, volatile unsigned long *addr)
> +___set_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	set_bit(nr, addr);
>  }
> @@ -109,7 +109,7 @@ static inline void bfclr_mem_clear_bit(int nr, volatile unsigned long *vaddr)
>  #endif
>  
>  static __always_inline void
> -__clear_bit(unsigned long nr, volatile unsigned long *addr)
> +___clear_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	clear_bit(nr, addr);
>  }
> @@ -152,13 +152,13 @@ static inline void bfchg_mem_change_bit(int nr, volatile unsigned long *vaddr)
>  #endif
>  
>  static __always_inline void
> -__change_bit(unsigned long nr, volatile unsigned long *addr)
> +___change_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	change_bit(nr, addr);
>  }
>  
>  static __always_inline bool
> -test_bit(unsigned long nr, const volatile unsigned long *addr)
> +_test_bit(unsigned long nr, const volatile unsigned long *addr)
>  {
>  	return (addr[nr >> 5] & (1UL << (nr & 31))) != 0;
>  }
> @@ -212,7 +212,7 @@ static inline int bfset_mem_test_and_set_bit(int nr,
>  #endif
>  
>  static __always_inline bool
> -__test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
> +___test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	return test_and_set_bit(nr, addr);
>  }
> @@ -265,7 +265,7 @@ static inline int bfclr_mem_test_and_clear_bit(int nr,
>  #endif
>  
>  static __always_inline bool
> -__test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
> +___test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	return test_and_clear_bit(nr, addr);
>  }
> @@ -318,7 +318,7 @@ static inline int bfchg_mem_test_and_change_bit(int nr,
>  #endif
>  
>  static __always_inline bool
> -__test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
> +___test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	return test_and_change_bit(nr, addr);
>  }
> diff --git a/arch/sh/include/asm/bitops-op32.h b/arch/sh/include/asm/bitops-op32.h
> index dcd85866a394..24b8a809c1b9 100644
> --- a/arch/sh/include/asm/bitops-op32.h
> +++ b/arch/sh/include/asm/bitops-op32.h
> @@ -19,7 +19,7 @@
>  #endif
>  
>  static __always_inline void
> -__set_bit(unsigned long nr, volatile unsigned long *addr)
> +___set_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	if (__builtin_constant_p(nr)) {
>  		__asm__ __volatile__ (
> @@ -37,7 +37,7 @@ __set_bit(unsigned long nr, volatile unsigned long *addr)
>  }
>  
>  static __always_inline void
> -__clear_bit(unsigned long nr, volatile unsigned long *addr)
> +___clear_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	if (__builtin_constant_p(nr)) {
>  		__asm__ __volatile__ (
> @@ -56,7 +56,7 @@ __clear_bit(unsigned long nr, volatile unsigned long *addr)
>  }
>  
>  /**
> - * __change_bit - Toggle a bit in memory
> + * ___change_bit - Toggle a bit in memory
>   * @nr: the bit to change
>   * @addr: the address to start counting from
>   *
> @@ -65,7 +65,7 @@ __clear_bit(unsigned long nr, volatile unsigned long *addr)
>   * may be that only one operation succeeds.
>   */
>  static __always_inline void
> -__change_bit(unsigned long nr, volatile unsigned long *addr)
> +___change_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	if (__builtin_constant_p(nr)) {
>  		__asm__ __volatile__ (
> @@ -84,7 +84,7 @@ __change_bit(unsigned long nr, volatile unsigned long *addr)
>  }
>  
>  /**
> - * __test_and_set_bit - Set a bit and return its old value
> + * ___test_and_set_bit - Set a bit and return its old value
>   * @nr: Bit to set
>   * @addr: Address to count from
>   *
> @@ -93,7 +93,7 @@ __change_bit(unsigned long nr, volatile unsigned long *addr)
>   * but actually fail.  You must protect multiple accesses with a lock.
>   */
>  static __always_inline bool
> -__test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
> +___test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	unsigned long mask = BIT_MASK(nr);
>  	unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
> @@ -104,7 +104,7 @@ __test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
>  }
>  
>  /**
> - * __test_and_clear_bit - Clear a bit and return its old value
> + * ___test_and_clear_bit - Clear a bit and return its old value
>   * @nr: Bit to clear
>   * @addr: Address to count from
>   *
> @@ -113,7 +113,7 @@ __test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
>   * but actually fail.  You must protect multiple accesses with a lock.
>   */
>  static __always_inline bool
> -__test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
> +___test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	unsigned long mask = BIT_MASK(nr);
>  	unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
> @@ -125,7 +125,7 @@ __test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
>  
>  /* WARNING: non atomic and it can be reordered! */
>  static __always_inline bool
> -__test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
> +___test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	unsigned long mask = BIT_MASK(nr);
>  	unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
> @@ -136,12 +136,12 @@ __test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
>  }
>  
>  /**
> - * test_bit - Determine whether a bit is set
> + * _test_bit - Determine whether a bit is set
>   * @nr: bit number to test
>   * @addr: Address to start counting from
>   */
>  static __always_inline bool
> -test_bit(unsigned long nr, const volatile unsigned long *addr)
> +_test_bit(unsigned long nr, const volatile unsigned long *addr)
>  {
>  	return 1UL & (addr[BIT_WORD(nr)] >> (nr & (BITS_PER_LONG-1)));
>  }
> diff --git a/arch/sparc/include/asm/bitops_32.h b/arch/sparc/include/asm/bitops_32.h
> index 889afa9f990f..3448c191b484 100644
> --- a/arch/sparc/include/asm/bitops_32.h
> +++ b/arch/sparc/include/asm/bitops_32.h
> @@ -19,9 +19,9 @@
>  #error only <linux/bitops.h> can be included directly
>  #endif
>  
> -unsigned long ___set_bit(unsigned long *addr, unsigned long mask);
> -unsigned long ___clear_bit(unsigned long *addr, unsigned long mask);
> -unsigned long ___change_bit(unsigned long *addr, unsigned long mask);
> +unsigned long sp32___set_bit(unsigned long *addr, unsigned long mask);
> +unsigned long sp32___clear_bit(unsigned long *addr, unsigned long mask);
> +unsigned long sp32___change_bit(unsigned long *addr, unsigned long mask);
>  
>  /*
>   * Set bit 'nr' in 32-bit quantity at address 'addr' where bit '0'
> @@ -36,7 +36,7 @@ static inline int test_and_set_bit(unsigned long nr, volatile unsigned long *add
>  	ADDR = ((unsigned long *) addr) + (nr >> 5);
>  	mask = 1 << (nr & 31);
>  
> -	return ___set_bit(ADDR, mask) != 0;
> +	return sp32___set_bit(ADDR, mask) != 0;
>  }
>  
>  static inline void set_bit(unsigned long nr, volatile unsigned long *addr)
> @@ -46,7 +46,7 @@ static inline void set_bit(unsigned long nr, volatile unsigned long *addr)
>  	ADDR = ((unsigned long *) addr) + (nr >> 5);
>  	mask = 1 << (nr & 31);
>  
> -	(void) ___set_bit(ADDR, mask);
> +	(void) sp32___set_bit(ADDR, mask);
>  }
>  
>  static inline int test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
> @@ -56,7 +56,7 @@ static inline int test_and_clear_bit(unsigned long nr, volatile unsigned long *a
>  	ADDR = ((unsigned long *) addr) + (nr >> 5);
>  	mask = 1 << (nr & 31);
>  
> -	return ___clear_bit(ADDR, mask) != 0;
> +	return sp32___clear_bit(ADDR, mask) != 0;
>  }
>  
>  static inline void clear_bit(unsigned long nr, volatile unsigned long *addr)
> @@ -66,7 +66,7 @@ static inline void clear_bit(unsigned long nr, volatile unsigned long *addr)
>  	ADDR = ((unsigned long *) addr) + (nr >> 5);
>  	mask = 1 << (nr & 31);
>  
> -	(void) ___clear_bit(ADDR, mask);
> +	(void) sp32___clear_bit(ADDR, mask);
>  }
>  
>  static inline int test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
> @@ -76,7 +76,7 @@ static inline int test_and_change_bit(unsigned long nr, volatile unsigned long *
>  	ADDR = ((unsigned long *) addr) + (nr >> 5);
>  	mask = 1 << (nr & 31);
>  
> -	return ___change_bit(ADDR, mask) != 0;
> +	return sp32___change_bit(ADDR, mask) != 0;
>  }
>  
>  static inline void change_bit(unsigned long nr, volatile unsigned long *addr)
> @@ -86,7 +86,7 @@ static inline void change_bit(unsigned long nr, volatile unsigned long *addr)
>  	ADDR = ((unsigned long *) addr) + (nr >> 5);
>  	mask = 1 << (nr & 31);
>  
> -	(void) ___change_bit(ADDR, mask);
> +	(void) sp32___change_bit(ADDR, mask);
>  }
>  
>  #include <asm-generic/bitops/non-atomic.h>
> diff --git a/arch/sparc/lib/atomic32.c b/arch/sparc/lib/atomic32.c
> index 8b81d0f00c97..cf80d1ae352b 100644
> --- a/arch/sparc/lib/atomic32.c
> +++ b/arch/sparc/lib/atomic32.c
> @@ -120,7 +120,7 @@ void arch_atomic_set(atomic_t *v, int i)
>  }
>  EXPORT_SYMBOL(arch_atomic_set);
>  
> -unsigned long ___set_bit(unsigned long *addr, unsigned long mask)
> +unsigned long sp32___set_bit(unsigned long *addr, unsigned long mask)
>  {
>  	unsigned long old, flags;
>  
> @@ -131,9 +131,9 @@ unsigned long ___set_bit(unsigned long *addr, unsigned long mask)
>  
>  	return old & mask;
>  }
> -EXPORT_SYMBOL(___set_bit);
> +EXPORT_SYMBOL(sp32___set_bit);
>  
> -unsigned long ___clear_bit(unsigned long *addr, unsigned long mask)
> +unsigned long sp32___clear_bit(unsigned long *addr, unsigned long mask)
>  {
>  	unsigned long old, flags;
>  
> @@ -144,9 +144,9 @@ unsigned long ___clear_bit(unsigned long *addr, unsigned long mask)
>  
>  	return old & mask;
>  }
> -EXPORT_SYMBOL(___clear_bit);
> +EXPORT_SYMBOL(sp32___clear_bit);
>  
> -unsigned long ___change_bit(unsigned long *addr, unsigned long mask)
> +unsigned long sp32___change_bit(unsigned long *addr, unsigned long mask)
>  {
>  	unsigned long old, flags;
>  
> @@ -157,7 +157,7 @@ unsigned long ___change_bit(unsigned long *addr, unsigned long mask)
>  
>  	return old & mask;
>  }
> -EXPORT_SYMBOL(___change_bit);
> +EXPORT_SYMBOL(sp32___change_bit);
>  
>  unsigned long __cmpxchg_u32(volatile u32 *ptr, u32 old, u32 new)
>  {
> diff --git a/include/asm-generic/bitops/instrumented-non-atomic.h b/include/asm-generic/bitops/instrumented-non-atomic.h
> index b019f77ef21c..988a3bbfba34 100644
> --- a/include/asm-generic/bitops/instrumented-non-atomic.h
> +++ b/include/asm-generic/bitops/instrumented-non-atomic.h
> @@ -14,7 +14,7 @@
>  #include <linux/instrumented.h>
>  
>  /**
> - * __set_bit - Set a bit in memory
> + * ___set_bit - Set a bit in memory
>   * @nr: the bit to set
>   * @addr: the address to start counting from
>   *
> @@ -23,14 +23,14 @@
>   * succeeds.
>   */
>  static __always_inline void
> -__set_bit(unsigned long nr, volatile unsigned long *addr)
> +___set_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	instrument_write(addr + BIT_WORD(nr), sizeof(long));
>  	arch___set_bit(nr, addr);
>  }
>  
>  /**
> - * __clear_bit - Clears a bit in memory
> + * ___clear_bit - Clears a bit in memory
>   * @nr: the bit to clear
>   * @addr: the address to start counting from
>   *
> @@ -39,14 +39,14 @@ __set_bit(unsigned long nr, volatile unsigned long *addr)
>   * succeeds.
>   */
>  static __always_inline void
> -__clear_bit(unsigned long nr, volatile unsigned long *addr)
> +___clear_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	instrument_write(addr + BIT_WORD(nr), sizeof(long));
>  	arch___clear_bit(nr, addr);
>  }
>  
>  /**
> - * __change_bit - Toggle a bit in memory
> + * ___change_bit - Toggle a bit in memory
>   * @nr: the bit to change
>   * @addr: the address to start counting from
>   *
> @@ -55,7 +55,7 @@ __clear_bit(unsigned long nr, volatile unsigned long *addr)
>   * succeeds.
>   */
>  static __always_inline void
> -__change_bit(unsigned long nr, volatile unsigned long *addr)
> +___change_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	instrument_write(addr + BIT_WORD(nr), sizeof(long));
>  	arch___change_bit(nr, addr);
> @@ -86,7 +86,7 @@ static __always_inline void __instrument_read_write_bitop(long nr, volatile unsi
>  }
>  
>  /**
> - * __test_and_set_bit - Set a bit and return its old value
> + * ___test_and_set_bit - Set a bit and return its old value
>   * @nr: Bit to set
>   * @addr: Address to count from
>   *
> @@ -94,14 +94,14 @@ static __always_inline void __instrument_read_write_bitop(long nr, volatile unsi
>   * can appear to succeed but actually fail.
>   */
>  static __always_inline bool
> -__test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
> +___test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	__instrument_read_write_bitop(nr, addr);
>  	return arch___test_and_set_bit(nr, addr);
>  }
>  
>  /**
> - * __test_and_clear_bit - Clear a bit and return its old value
> + * ___test_and_clear_bit - Clear a bit and return its old value
>   * @nr: Bit to clear
>   * @addr: Address to count from
>   *
> @@ -109,14 +109,14 @@ __test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
>   * can appear to succeed but actually fail.
>   */
>  static __always_inline bool
> -__test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
> +___test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	__instrument_read_write_bitop(nr, addr);
>  	return arch___test_and_clear_bit(nr, addr);
>  }
>  
>  /**
> - * __test_and_change_bit - Change a bit and return its old value
> + * ___test_and_change_bit - Change a bit and return its old value
>   * @nr: Bit to change
>   * @addr: Address to count from
>   *
> @@ -124,19 +124,19 @@ __test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
>   * can appear to succeed but actually fail.
>   */
>  static __always_inline bool
> -__test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
> +___test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	__instrument_read_write_bitop(nr, addr);
>  	return arch___test_and_change_bit(nr, addr);
>  }
>  
>  /**
> - * test_bit - Determine whether a bit is set
> + * _test_bit - Determine whether a bit is set
>   * @nr: bit number to test
>   * @addr: Address to start counting from
>   */
>  static __always_inline bool
> -test_bit(unsigned long nr, const volatile unsigned long *addr)
> +_test_bit(unsigned long nr, const volatile unsigned long *addr)
>  {
>  	instrument_atomic_read(addr + BIT_WORD(nr), sizeof(long));
>  	return arch_test_bit(nr, addr);
> diff --git a/include/asm-generic/bitops/non-atomic.h b/include/asm-generic/bitops/non-atomic.h
> index 7ce0ed22fb5f..0c488331c9e7 100644
> --- a/include/asm-generic/bitops/non-atomic.h
> +++ b/include/asm-generic/bitops/non-atomic.h
> @@ -6,24 +6,24 @@
>  #include <asm/types.h>
>  
>  #define arch___set_bit gen___set_bit
> -#define __set_bit arch___set_bit
> +#define ___set_bit arch___set_bit
>  
>  #define arch___clear_bit gen___clear_bit
> -#define __clear_bit arch___clear_bit
> +#define ___clear_bit arch___clear_bit
>  
>  #define arch___change_bit gen___change_bit
> -#define __change_bit arch___change_bit
> +#define ___change_bit arch___change_bit
>  
>  #define arch___test_and_set_bit gen___test_and_set_bit
> -#define __test_and_set_bit arch___test_and_set_bit
> +#define ___test_and_set_bit arch___test_and_set_bit
>  
>  #define arch___test_and_clear_bit gen___test_and_clear_bit
> -#define __test_and_clear_bit arch___test_and_clear_bit
> +#define ___test_and_clear_bit arch___test_and_clear_bit
>  
>  #define arch___test_and_change_bit gen___test_and_change_bit
> -#define __test_and_change_bit arch___test_and_change_bit
> +#define ___test_and_change_bit arch___test_and_change_bit
>  
>  #define arch_test_bit gen_test_bit
> -#define test_bit arch_test_bit
> +#define _test_bit arch_test_bit
>  
>  #endif /* _ASM_GENERIC_BITOPS_NON_ATOMIC_H_ */
> diff --git a/include/linux/bitops.h b/include/linux/bitops.h
> index 5520ac9b1c24..33cfc836a115 100644
> --- a/include/linux/bitops.h
> +++ b/include/linux/bitops.h
> @@ -26,8 +26,24 @@ extern unsigned int __sw_hweight16(unsigned int w);
>  extern unsigned int __sw_hweight32(unsigned int w);
>  extern unsigned long __sw_hweight64(__u64 w);
>  
> +/*
> + * Defined here because those may be needed by architecture-specific static
> + * inlines.
> + */
> +
>  #include <asm-generic/bitops/generic-non-atomic.h>
>  
> +#define bitop(op, nr, addr)						\
> +	op(nr, addr)
> +
> +#define __set_bit(nr, addr)		bitop(___set_bit, nr, addr)
> +#define __clear_bit(nr, addr)		bitop(___clear_bit, nr, addr)
> +#define __change_bit(nr, addr)		bitop(___change_bit, nr, addr)
> +#define __test_and_set_bit(nr, addr)	bitop(___test_and_set_bit, nr, addr)
> +#define __test_and_clear_bit(nr, addr)	bitop(___test_and_clear_bit, nr, addr)
> +#define __test_and_change_bit(nr, addr)	bitop(___test_and_change_bit, nr, addr)
> +#define test_bit(nr, addr)		bitop(_test_bit, nr, addr)
> +
>  /*
>   * Include this here because some architectures need generic_ffs/fls in
>   * scope
> @@ -35,14 +51,14 @@ extern unsigned long __sw_hweight64(__u64 w);
>  #include <asm/bitops.h>
>  
>  /* Check that the bitops prototypes are sane */
> -#define __check_bitop_pr(name)	static_assert(__same_type(name, gen_##name))
> -__check_bitop_pr(__set_bit);
> -__check_bitop_pr(__clear_bit);
> -__check_bitop_pr(__change_bit);
> -__check_bitop_pr(__test_and_set_bit);
> -__check_bitop_pr(__test_and_clear_bit);
> -__check_bitop_pr(__test_and_change_bit);
> -__check_bitop_pr(test_bit);
> +#define __check_bitop_pr(name)	static_assert(__same_type(name, gen##name))
> +__check_bitop_pr(___set_bit);
> +__check_bitop_pr(___clear_bit);
> +__check_bitop_pr(___change_bit);
> +__check_bitop_pr(___test_and_set_bit);
> +__check_bitop_pr(___test_and_clear_bit);
> +__check_bitop_pr(___test_and_change_bit);
> +__check_bitop_pr(_test_bit);
>  #undef __check_bitop_pr
>  
>  static inline int get_bitmask_order(unsigned int count)
> diff --git a/tools/include/asm-generic/bitops/non-atomic.h b/tools/include/asm-generic/bitops/non-atomic.h
> index e5e78e42e57b..0c472a833408 100644
> --- a/tools/include/asm-generic/bitops/non-atomic.h
> +++ b/tools/include/asm-generic/bitops/non-atomic.h
> @@ -5,7 +5,7 @@
>  #include <linux/bits.h>
>  
>  /**
> - * __set_bit - Set a bit in memory
> + * ___set_bit - Set a bit in memory
>   * @nr: the bit to set
>   * @addr: the address to start counting from
>   *
> @@ -14,7 +14,7 @@
>   * may be that only one operation succeeds.
>   */
>  static __always_inline void
> -__set_bit(unsigned long nr, volatile unsigned long *addr)
> +___set_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	unsigned long mask = BIT_MASK(nr);
>  	unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
> @@ -23,7 +23,7 @@ __set_bit(unsigned long nr, volatile unsigned long *addr)
>  }
>  
>  static __always_inline void
> -__clear_bit(unsigned long nr, volatile unsigned long *addr)
> +___clear_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	unsigned long mask = BIT_MASK(nr);
>  	unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
> @@ -32,7 +32,7 @@ __clear_bit(unsigned long nr, volatile unsigned long *addr)
>  }
>  
>  /**
> - * __change_bit - Toggle a bit in memory
> + * ___change_bit - Toggle a bit in memory
>   * @nr: the bit to change
>   * @addr: the address to start counting from
>   *
> @@ -41,7 +41,7 @@ __clear_bit(unsigned long nr, volatile unsigned long *addr)
>   * may be that only one operation succeeds.
>   */
>  static __always_inline void
> -__change_bit(unsigned long nr, volatile unsigned long *addr)
> +___change_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	unsigned long mask = BIT_MASK(nr);
>  	unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
> @@ -50,7 +50,7 @@ __change_bit(unsigned long nr, volatile unsigned long *addr)
>  }
>  
>  /**
> - * __test_and_set_bit - Set a bit and return its old value
> + * ___test_and_set_bit - Set a bit and return its old value
>   * @nr: Bit to set
>   * @addr: Address to count from
>   *
> @@ -59,7 +59,7 @@ __change_bit(unsigned long nr, volatile unsigned long *addr)
>   * but actually fail.  You must protect multiple accesses with a lock.
>   */
>  static __always_inline bool
> -__test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
> +___test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	unsigned long mask = BIT_MASK(nr);
>  	unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
> @@ -70,7 +70,7 @@ __test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
>  }
>  
>  /**
> - * __test_and_clear_bit - Clear a bit and return its old value
> + * ___test_and_clear_bit - Clear a bit and return its old value
>   * @nr: Bit to clear
>   * @addr: Address to count from
>   *
> @@ -79,7 +79,7 @@ __test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
>   * but actually fail.  You must protect multiple accesses with a lock.
>   */
>  static __always_inline bool
> -__test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
> +___test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	unsigned long mask = BIT_MASK(nr);
>  	unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
> @@ -91,7 +91,7 @@ __test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
>  
>  /* WARNING: non atomic and it can be reordered! */
>  static __always_inline bool
> -__test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
> +___test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
>  {
>  	unsigned long mask = BIT_MASK(nr);
>  	unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
> @@ -102,12 +102,12 @@ __test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
>  }
>  
>  /**
> - * test_bit - Determine whether a bit is set
> + * _test_bit - Determine whether a bit is set
>   * @nr: bit number to test
>   * @addr: Address to start counting from
>   */
>  static __always_inline bool
> -test_bit(unsigned long nr, const volatile unsigned long *addr)
> +_test_bit(unsigned long nr, const volatile unsigned long *addr)
>  {
>  	return 1UL & (addr[BIT_WORD(nr)] >> (nr & (BITS_PER_LONG-1)));
>  }
> diff --git a/tools/include/linux/bitops.h b/tools/include/linux/bitops.h
> index 5fca38fe1ba8..f18683b95ea6 100644
> --- a/tools/include/linux/bitops.h
> +++ b/tools/include/linux/bitops.h
> @@ -25,6 +25,22 @@ extern unsigned int __sw_hweight16(unsigned int w);
>  extern unsigned int __sw_hweight32(unsigned int w);
>  extern unsigned long __sw_hweight64(__u64 w);
>  
> +/*
> + * Defined here because those may be needed by architecture-specific static
> + * inlines.
> + */
> +
> +#define bitop(op, nr, addr)						\
> +	op(nr, addr)
> +
> +#define __set_bit(nr, addr)		bitop(___set_bit, nr, addr)
> +#define __clear_bit(nr, addr)		bitop(___clear_bit, nr, addr)
> +#define __change_bit(nr, addr)		bitop(___change_bit, nr, addr)
> +#define __test_and_set_bit(nr, addr)	bitop(___test_and_set_bit, nr, addr)
> +#define __test_and_clear_bit(nr, addr)	bitop(___test_and_clear_bit, nr, addr)
> +#define __test_and_change_bit(nr, addr)	bitop(___test_and_change_bit, nr, addr)
> +#define test_bit(nr, addr)		bitop(_test_bit, nr, addr)
> +
>  /*
>   * Include this here because some architectures need generic_ffs/fls in
>   * scope
> -- 
> 2.36.1
>