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Date:   Thu, 25 Jun 2020 08:38:04 -0700
From:   "Paul E. McKenney" <paulmck@kernel.org>
To:     Peter Zijlstra <peterz@infradead.org>
Cc:     Marco Elver <elver@google.com>, kernel test robot <lkp@intel.com>,
        kbuild-all@lists.01.org, LKML <linux-kernel@vger.kernel.org>,
        Will Deacon <will@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>
Subject: Re: [rcu:rcu/next 35/35] kernel/rcu/tree.c:251:8: error: implicit
 declaration of function 'arch_atomic_add_return'; did you mean
Message-ID: <20200625153804.GP9247@paulmck-ThinkPad-P72>
Reply-To: paulmck@kernel.org
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 <20200625112926.GO4781@hirez.programming.kicks-ass.net>
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On Thu, Jun 25, 2020 at 04:11:25PM +0200, Peter Zijlstra wrote:
> On Thu, Jun 25, 2020 at 01:29:26PM +0200, Peter Zijlstra wrote:
> > I fear the same. Let me see if I can quickly modify the atomic scripts
> > to generate the required fallbacks.
> 
> Something like so ought to work, I suppose.

Thank you!

I have queued this up under your earlier patch on v5.8-rc1 as -rcu
branch "rcu/urgent".  I have started testing.

							Thanx, Paul

> ---
> Subject: locking/atomics: Provide the arch_atomic_ interface to generic code
> From: Peter Zijlstra <peterz@infradead.org>
> Date: Thu Jun 25 15:55:14 CEST 2020
> 
> Architectures with instrumented (KASAN/KCSAN) atomic operations
> natively provide arch_atomic_ variants that are not instrumented.
> 
> It turns out that some generic code also requires arch_atomic_ in
> order to avoid instrumentation, so provide the arch_atomic_ interface
> as a direct map into the regular atomic_ interface for
> non-instrumented architectures.
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
> ---
>  include/linux/atomic-fallback.h       |  236 +++++++++++++++++++++++++++++++++-
>  scripts/atomic/gen-atomic-fallback.sh |   31 ++++
>  2 files changed, 266 insertions(+), 1 deletion(-)
> 
> --- a/include/linux/atomic-fallback.h
> +++ b/include/linux/atomic-fallback.h
> @@ -77,6 +77,9 @@
>  
>  #endif /* cmpxchg64_relaxed */
>  
> +#define arch_atomic_read atomic_read
> +#define arch_atomic_read_acquire atomic_read_acquire
> +
>  #ifndef atomic_read_acquire
>  static __always_inline int
>  atomic_read_acquire(const atomic_t *v)
> @@ -86,6 +89,9 @@ atomic_read_acquire(const atomic_t *v)
>  #define atomic_read_acquire atomic_read_acquire
>  #endif
>  
> +#define arch_atomic_set atomic_set
> +#define arch_atomic_set_release atomic_set_release
> +
>  #ifndef atomic_set_release
>  static __always_inline void
>  atomic_set_release(atomic_t *v, int i)
> @@ -95,6 +101,13 @@ atomic_set_release(atomic_t *v, int i)
>  #define atomic_set_release atomic_set_release
>  #endif
>  
> +#define arch_atomic_add atomic_add
> +
> +#define arch_atomic_add_return atomic_add_return
> +#define arch_atomic_add_return_acquire atomic_add_return_acquire
> +#define arch_atomic_add_return_release atomic_add_return_release
> +#define arch_atomic_add_return_relaxed atomic_add_return_relaxed
> +
>  #ifndef atomic_add_return_relaxed
>  #define atomic_add_return_acquire atomic_add_return
>  #define atomic_add_return_release atomic_add_return
> @@ -137,6 +150,11 @@ atomic_add_return(int i, atomic_t *v)
>  
>  #endif /* atomic_add_return_relaxed */
>  
> +#define arch_atomic_fetch_add atomic_fetch_add
> +#define arch_atomic_fetch_add_acquire atomic_fetch_add_acquire
> +#define arch_atomic_fetch_add_release atomic_fetch_add_release
> +#define arch_atomic_fetch_add_relaxed atomic_fetch_add_relaxed
> +
>  #ifndef atomic_fetch_add_relaxed
>  #define atomic_fetch_add_acquire atomic_fetch_add
>  #define atomic_fetch_add_release atomic_fetch_add
> @@ -179,6 +197,13 @@ atomic_fetch_add(int i, atomic_t *v)
>  
>  #endif /* atomic_fetch_add_relaxed */
>  
> +#define arch_atomic_sub atomic_sub
> +
> +#define arch_atomic_sub_return atomic_sub_return
> +#define arch_atomic_sub_return_acquire atomic_sub_return_acquire
> +#define arch_atomic_sub_return_release atomic_sub_return_release
> +#define arch_atomic_sub_return_relaxed atomic_sub_return_relaxed
> +
>  #ifndef atomic_sub_return_relaxed
>  #define atomic_sub_return_acquire atomic_sub_return
>  #define atomic_sub_return_release atomic_sub_return
> @@ -221,6 +246,11 @@ atomic_sub_return(int i, atomic_t *v)
>  
>  #endif /* atomic_sub_return_relaxed */
>  
> +#define arch_atomic_fetch_sub atomic_fetch_sub
> +#define arch_atomic_fetch_sub_acquire atomic_fetch_sub_acquire
> +#define arch_atomic_fetch_sub_release atomic_fetch_sub_release
> +#define arch_atomic_fetch_sub_relaxed atomic_fetch_sub_relaxed
> +
>  #ifndef atomic_fetch_sub_relaxed
>  #define atomic_fetch_sub_acquire atomic_fetch_sub
>  #define atomic_fetch_sub_release atomic_fetch_sub
> @@ -263,6 +293,8 @@ atomic_fetch_sub(int i, atomic_t *v)
>  
>  #endif /* atomic_fetch_sub_relaxed */
>  
> +#define arch_atomic_inc atomic_inc
> +
>  #ifndef atomic_inc
>  static __always_inline void
>  atomic_inc(atomic_t *v)
> @@ -272,6 +304,11 @@ atomic_inc(atomic_t *v)
>  #define atomic_inc atomic_inc
>  #endif
>  
> +#define arch_atomic_inc_return atomic_inc_return
> +#define arch_atomic_inc_return_acquire atomic_inc_return_acquire
> +#define arch_atomic_inc_return_release atomic_inc_return_release
> +#define arch_atomic_inc_return_relaxed atomic_inc_return_relaxed
> +
>  #ifndef atomic_inc_return_relaxed
>  #ifdef atomic_inc_return
>  #define atomic_inc_return_acquire atomic_inc_return
> @@ -353,6 +390,11 @@ atomic_inc_return(atomic_t *v)
>  
>  #endif /* atomic_inc_return_relaxed */
>  
> +#define arch_atomic_fetch_inc atomic_fetch_inc
> +#define arch_atomic_fetch_inc_acquire atomic_fetch_inc_acquire
> +#define arch_atomic_fetch_inc_release atomic_fetch_inc_release
> +#define arch_atomic_fetch_inc_relaxed atomic_fetch_inc_relaxed
> +
>  #ifndef atomic_fetch_inc_relaxed
>  #ifdef atomic_fetch_inc
>  #define atomic_fetch_inc_acquire atomic_fetch_inc
> @@ -434,6 +476,8 @@ atomic_fetch_inc(atomic_t *v)
>  
>  #endif /* atomic_fetch_inc_relaxed */
>  
> +#define arch_atomic_dec atomic_dec
> +
>  #ifndef atomic_dec
>  static __always_inline void
>  atomic_dec(atomic_t *v)
> @@ -443,6 +487,11 @@ atomic_dec(atomic_t *v)
>  #define atomic_dec atomic_dec
>  #endif
>  
> +#define arch_atomic_dec_return atomic_dec_return
> +#define arch_atomic_dec_return_acquire atomic_dec_return_acquire
> +#define arch_atomic_dec_return_release atomic_dec_return_release
> +#define arch_atomic_dec_return_relaxed atomic_dec_return_relaxed
> +
>  #ifndef atomic_dec_return_relaxed
>  #ifdef atomic_dec_return
>  #define atomic_dec_return_acquire atomic_dec_return
> @@ -524,6 +573,11 @@ atomic_dec_return(atomic_t *v)
>  
>  #endif /* atomic_dec_return_relaxed */
>  
> +#define arch_atomic_fetch_dec atomic_fetch_dec
> +#define arch_atomic_fetch_dec_acquire atomic_fetch_dec_acquire
> +#define arch_atomic_fetch_dec_release atomic_fetch_dec_release
> +#define arch_atomic_fetch_dec_relaxed atomic_fetch_dec_relaxed
> +
>  #ifndef atomic_fetch_dec_relaxed
>  #ifdef atomic_fetch_dec
>  #define atomic_fetch_dec_acquire atomic_fetch_dec
> @@ -605,6 +659,13 @@ atomic_fetch_dec(atomic_t *v)
>  
>  #endif /* atomic_fetch_dec_relaxed */
>  
> +#define arch_atomic_and atomic_and
> +
> +#define arch_atomic_fetch_and atomic_fetch_and
> +#define arch_atomic_fetch_and_acquire atomic_fetch_and_acquire
> +#define arch_atomic_fetch_and_release atomic_fetch_and_release
> +#define arch_atomic_fetch_and_relaxed atomic_fetch_and_relaxed
> +
>  #ifndef atomic_fetch_and_relaxed
>  #define atomic_fetch_and_acquire atomic_fetch_and
>  #define atomic_fetch_and_release atomic_fetch_and
> @@ -647,6 +708,8 @@ atomic_fetch_and(int i, atomic_t *v)
>  
>  #endif /* atomic_fetch_and_relaxed */
>  
> +#define arch_atomic_andnot atomic_andnot
> +
>  #ifndef atomic_andnot
>  static __always_inline void
>  atomic_andnot(int i, atomic_t *v)
> @@ -656,6 +719,11 @@ atomic_andnot(int i, atomic_t *v)
>  #define atomic_andnot atomic_andnot
>  #endif
>  
> +#define arch_atomic_fetch_andnot atomic_fetch_andnot
> +#define arch_atomic_fetch_andnot_acquire atomic_fetch_andnot_acquire
> +#define arch_atomic_fetch_andnot_release atomic_fetch_andnot_release
> +#define arch_atomic_fetch_andnot_relaxed atomic_fetch_andnot_relaxed
> +
>  #ifndef atomic_fetch_andnot_relaxed
>  #ifdef atomic_fetch_andnot
>  #define atomic_fetch_andnot_acquire atomic_fetch_andnot
> @@ -737,6 +805,13 @@ atomic_fetch_andnot(int i, atomic_t *v)
>  
>  #endif /* atomic_fetch_andnot_relaxed */
>  
> +#define arch_atomic_or atomic_or
> +
> +#define arch_atomic_fetch_or atomic_fetch_or
> +#define arch_atomic_fetch_or_acquire atomic_fetch_or_acquire
> +#define arch_atomic_fetch_or_release atomic_fetch_or_release
> +#define arch_atomic_fetch_or_relaxed atomic_fetch_or_relaxed
> +
>  #ifndef atomic_fetch_or_relaxed
>  #define atomic_fetch_or_acquire atomic_fetch_or
>  #define atomic_fetch_or_release atomic_fetch_or
> @@ -779,6 +854,13 @@ atomic_fetch_or(int i, atomic_t *v)
>  
>  #endif /* atomic_fetch_or_relaxed */
>  
> +#define arch_atomic_xor atomic_xor
> +
> +#define arch_atomic_fetch_xor atomic_fetch_xor
> +#define arch_atomic_fetch_xor_acquire atomic_fetch_xor_acquire
> +#define arch_atomic_fetch_xor_release atomic_fetch_xor_release
> +#define arch_atomic_fetch_xor_relaxed atomic_fetch_xor_relaxed
> +
>  #ifndef atomic_fetch_xor_relaxed
>  #define atomic_fetch_xor_acquire atomic_fetch_xor
>  #define atomic_fetch_xor_release atomic_fetch_xor
> @@ -821,6 +903,11 @@ atomic_fetch_xor(int i, atomic_t *v)
>  
>  #endif /* atomic_fetch_xor_relaxed */
>  
> +#define arch_atomic_xchg atomic_xchg
> +#define arch_atomic_xchg_acquire atomic_xchg_acquire
> +#define arch_atomic_xchg_release atomic_xchg_release
> +#define arch_atomic_xchg_relaxed atomic_xchg_relaxed
> +
>  #ifndef atomic_xchg_relaxed
>  #define atomic_xchg_acquire atomic_xchg
>  #define atomic_xchg_release atomic_xchg
> @@ -863,6 +950,11 @@ atomic_xchg(atomic_t *v, int i)
>  
>  #endif /* atomic_xchg_relaxed */
>  
> +#define arch_atomic_cmpxchg atomic_cmpxchg
> +#define arch_atomic_cmpxchg_acquire atomic_cmpxchg_acquire
> +#define arch_atomic_cmpxchg_release atomic_cmpxchg_release
> +#define arch_atomic_cmpxchg_relaxed atomic_cmpxchg_relaxed
> +
>  #ifndef atomic_cmpxchg_relaxed
>  #define atomic_cmpxchg_acquire atomic_cmpxchg
>  #define atomic_cmpxchg_release atomic_cmpxchg
> @@ -905,6 +997,11 @@ atomic_cmpxchg(atomic_t *v, int old, int
>  
>  #endif /* atomic_cmpxchg_relaxed */
>  
> +#define arch_atomic_try_cmpxchg atomic_try_cmpxchg
> +#define arch_atomic_try_cmpxchg_acquire atomic_try_cmpxchg_acquire
> +#define arch_atomic_try_cmpxchg_release atomic_try_cmpxchg_release
> +#define arch_atomic_try_cmpxchg_relaxed atomic_try_cmpxchg_relaxed
> +
>  #ifndef atomic_try_cmpxchg_relaxed
>  #ifdef atomic_try_cmpxchg
>  #define atomic_try_cmpxchg_acquire atomic_try_cmpxchg
> @@ -1002,6 +1099,8 @@ atomic_try_cmpxchg(atomic_t *v, int *old
>  
>  #endif /* atomic_try_cmpxchg_relaxed */
>  
> +#define arch_atomic_sub_and_test atomic_sub_and_test
> +
>  #ifndef atomic_sub_and_test
>  /**
>   * atomic_sub_and_test - subtract value from variable and test result
> @@ -1020,6 +1119,8 @@ atomic_sub_and_test(int i, atomic_t *v)
>  #define atomic_sub_and_test atomic_sub_and_test
>  #endif
>  
> +#define arch_atomic_dec_and_test atomic_dec_and_test
> +
>  #ifndef atomic_dec_and_test
>  /**
>   * atomic_dec_and_test - decrement and test
> @@ -1037,6 +1138,8 @@ atomic_dec_and_test(atomic_t *v)
>  #define atomic_dec_and_test atomic_dec_and_test
>  #endif
>  
> +#define arch_atomic_inc_and_test atomic_inc_and_test
> +
>  #ifndef atomic_inc_and_test
>  /**
>   * atomic_inc_and_test - increment and test
> @@ -1054,6 +1157,8 @@ atomic_inc_and_test(atomic_t *v)
>  #define atomic_inc_and_test atomic_inc_and_test
>  #endif
>  
> +#define arch_atomic_add_negative atomic_add_negative
> +
>  #ifndef atomic_add_negative
>  /**
>   * atomic_add_negative - add and test if negative
> @@ -1072,6 +1177,8 @@ atomic_add_negative(int i, atomic_t *v)
>  #define atomic_add_negative atomic_add_negative
>  #endif
>  
> +#define arch_atomic_fetch_add_unless atomic_fetch_add_unless
> +
>  #ifndef atomic_fetch_add_unless
>  /**
>   * atomic_fetch_add_unless - add unless the number is already a given value
> @@ -1097,6 +1204,8 @@ atomic_fetch_add_unless(atomic_t *v, int
>  #define atomic_fetch_add_unless atomic_fetch_add_unless
>  #endif
>  
> +#define arch_atomic_add_unless atomic_add_unless
> +
>  #ifndef atomic_add_unless
>  /**
>   * atomic_add_unless - add unless the number is already a given value
> @@ -1115,6 +1224,8 @@ atomic_add_unless(atomic_t *v, int a, in
>  #define atomic_add_unless atomic_add_unless
>  #endif
>  
> +#define arch_atomic_inc_not_zero atomic_inc_not_zero
> +
>  #ifndef atomic_inc_not_zero
>  /**
>   * atomic_inc_not_zero - increment unless the number is zero
> @@ -1131,6 +1242,8 @@ atomic_inc_not_zero(atomic_t *v)
>  #define atomic_inc_not_zero atomic_inc_not_zero
>  #endif
>  
> +#define arch_atomic_inc_unless_negative atomic_inc_unless_negative
> +
>  #ifndef atomic_inc_unless_negative
>  static __always_inline bool
>  atomic_inc_unless_negative(atomic_t *v)
> @@ -1147,6 +1260,8 @@ atomic_inc_unless_negative(atomic_t *v)
>  #define atomic_inc_unless_negative atomic_inc_unless_negative
>  #endif
>  
> +#define arch_atomic_dec_unless_positive atomic_dec_unless_positive
> +
>  #ifndef atomic_dec_unless_positive
>  static __always_inline bool
>  atomic_dec_unless_positive(atomic_t *v)
> @@ -1163,6 +1278,8 @@ atomic_dec_unless_positive(atomic_t *v)
>  #define atomic_dec_unless_positive atomic_dec_unless_positive
>  #endif
>  
> +#define arch_atomic_dec_if_positive atomic_dec_if_positive
> +
>  #ifndef atomic_dec_if_positive
>  static __always_inline int
>  atomic_dec_if_positive(atomic_t *v)
> @@ -1184,6 +1301,9 @@ atomic_dec_if_positive(atomic_t *v)
>  #include <asm-generic/atomic64.h>
>  #endif
>  
> +#define arch_atomic64_read atomic64_read
> +#define arch_atomic64_read_acquire atomic64_read_acquire
> +
>  #ifndef atomic64_read_acquire
>  static __always_inline s64
>  atomic64_read_acquire(const atomic64_t *v)
> @@ -1193,6 +1313,9 @@ atomic64_read_acquire(const atomic64_t *
>  #define atomic64_read_acquire atomic64_read_acquire
>  #endif
>  
> +#define arch_atomic64_set atomic64_set
> +#define arch_atomic64_set_release atomic64_set_release
> +
>  #ifndef atomic64_set_release
>  static __always_inline void
>  atomic64_set_release(atomic64_t *v, s64 i)
> @@ -1202,6 +1325,13 @@ atomic64_set_release(atomic64_t *v, s64
>  #define atomic64_set_release atomic64_set_release
>  #endif
>  
> +#define arch_atomic64_add atomic64_add
> +
> +#define arch_atomic64_add_return atomic64_add_return
> +#define arch_atomic64_add_return_acquire atomic64_add_return_acquire
> +#define arch_atomic64_add_return_release atomic64_add_return_release
> +#define arch_atomic64_add_return_relaxed atomic64_add_return_relaxed
> +
>  #ifndef atomic64_add_return_relaxed
>  #define atomic64_add_return_acquire atomic64_add_return
>  #define atomic64_add_return_release atomic64_add_return
> @@ -1244,6 +1374,11 @@ atomic64_add_return(s64 i, atomic64_t *v
>  
>  #endif /* atomic64_add_return_relaxed */
>  
> +#define arch_atomic64_fetch_add atomic64_fetch_add
> +#define arch_atomic64_fetch_add_acquire atomic64_fetch_add_acquire
> +#define arch_atomic64_fetch_add_release atomic64_fetch_add_release
> +#define arch_atomic64_fetch_add_relaxed atomic64_fetch_add_relaxed
> +
>  #ifndef atomic64_fetch_add_relaxed
>  #define atomic64_fetch_add_acquire atomic64_fetch_add
>  #define atomic64_fetch_add_release atomic64_fetch_add
> @@ -1286,6 +1421,13 @@ atomic64_fetch_add(s64 i, atomic64_t *v)
>  
>  #endif /* atomic64_fetch_add_relaxed */
>  
> +#define arch_atomic64_sub atomic64_sub
> +
> +#define arch_atomic64_sub_return atomic64_sub_return
> +#define arch_atomic64_sub_return_acquire atomic64_sub_return_acquire
> +#define arch_atomic64_sub_return_release atomic64_sub_return_release
> +#define arch_atomic64_sub_return_relaxed atomic64_sub_return_relaxed
> +
>  #ifndef atomic64_sub_return_relaxed
>  #define atomic64_sub_return_acquire atomic64_sub_return
>  #define atomic64_sub_return_release atomic64_sub_return
> @@ -1328,6 +1470,11 @@ atomic64_sub_return(s64 i, atomic64_t *v
>  
>  #endif /* atomic64_sub_return_relaxed */
>  
> +#define arch_atomic64_fetch_sub atomic64_fetch_sub
> +#define arch_atomic64_fetch_sub_acquire atomic64_fetch_sub_acquire
> +#define arch_atomic64_fetch_sub_release atomic64_fetch_sub_release
> +#define arch_atomic64_fetch_sub_relaxed atomic64_fetch_sub_relaxed
> +
>  #ifndef atomic64_fetch_sub_relaxed
>  #define atomic64_fetch_sub_acquire atomic64_fetch_sub
>  #define atomic64_fetch_sub_release atomic64_fetch_sub
> @@ -1370,6 +1517,8 @@ atomic64_fetch_sub(s64 i, atomic64_t *v)
>  
>  #endif /* atomic64_fetch_sub_relaxed */
>  
> +#define arch_atomic64_inc atomic64_inc
> +
>  #ifndef atomic64_inc
>  static __always_inline void
>  atomic64_inc(atomic64_t *v)
> @@ -1379,6 +1528,11 @@ atomic64_inc(atomic64_t *v)
>  #define atomic64_inc atomic64_inc
>  #endif
>  
> +#define arch_atomic64_inc_return atomic64_inc_return
> +#define arch_atomic64_inc_return_acquire atomic64_inc_return_acquire
> +#define arch_atomic64_inc_return_release atomic64_inc_return_release
> +#define arch_atomic64_inc_return_relaxed atomic64_inc_return_relaxed
> +
>  #ifndef atomic64_inc_return_relaxed
>  #ifdef atomic64_inc_return
>  #define atomic64_inc_return_acquire atomic64_inc_return
> @@ -1460,6 +1614,11 @@ atomic64_inc_return(atomic64_t *v)
>  
>  #endif /* atomic64_inc_return_relaxed */
>  
> +#define arch_atomic64_fetch_inc atomic64_fetch_inc
> +#define arch_atomic64_fetch_inc_acquire atomic64_fetch_inc_acquire
> +#define arch_atomic64_fetch_inc_release atomic64_fetch_inc_release
> +#define arch_atomic64_fetch_inc_relaxed atomic64_fetch_inc_relaxed
> +
>  #ifndef atomic64_fetch_inc_relaxed
>  #ifdef atomic64_fetch_inc
>  #define atomic64_fetch_inc_acquire atomic64_fetch_inc
> @@ -1541,6 +1700,8 @@ atomic64_fetch_inc(atomic64_t *v)
>  
>  #endif /* atomic64_fetch_inc_relaxed */
>  
> +#define arch_atomic64_dec atomic64_dec
> +
>  #ifndef atomic64_dec
>  static __always_inline void
>  atomic64_dec(atomic64_t *v)
> @@ -1550,6 +1711,11 @@ atomic64_dec(atomic64_t *v)
>  #define atomic64_dec atomic64_dec
>  #endif
>  
> +#define arch_atomic64_dec_return atomic64_dec_return
> +#define arch_atomic64_dec_return_acquire atomic64_dec_return_acquire
> +#define arch_atomic64_dec_return_release atomic64_dec_return_release
> +#define arch_atomic64_dec_return_relaxed atomic64_dec_return_relaxed
> +
>  #ifndef atomic64_dec_return_relaxed
>  #ifdef atomic64_dec_return
>  #define atomic64_dec_return_acquire atomic64_dec_return
> @@ -1631,6 +1797,11 @@ atomic64_dec_return(atomic64_t *v)
>  
>  #endif /* atomic64_dec_return_relaxed */
>  
> +#define arch_atomic64_fetch_dec atomic64_fetch_dec
> +#define arch_atomic64_fetch_dec_acquire atomic64_fetch_dec_acquire
> +#define arch_atomic64_fetch_dec_release atomic64_fetch_dec_release
> +#define arch_atomic64_fetch_dec_relaxed atomic64_fetch_dec_relaxed
> +
>  #ifndef atomic64_fetch_dec_relaxed
>  #ifdef atomic64_fetch_dec
>  #define atomic64_fetch_dec_acquire atomic64_fetch_dec
> @@ -1712,6 +1883,13 @@ atomic64_fetch_dec(atomic64_t *v)
>  
>  #endif /* atomic64_fetch_dec_relaxed */
>  
> +#define arch_atomic64_and atomic64_and
> +
> +#define arch_atomic64_fetch_and atomic64_fetch_and
> +#define arch_atomic64_fetch_and_acquire atomic64_fetch_and_acquire
> +#define arch_atomic64_fetch_and_release atomic64_fetch_and_release
> +#define arch_atomic64_fetch_and_relaxed atomic64_fetch_and_relaxed
> +
>  #ifndef atomic64_fetch_and_relaxed
>  #define atomic64_fetch_and_acquire atomic64_fetch_and
>  #define atomic64_fetch_and_release atomic64_fetch_and
> @@ -1754,6 +1932,8 @@ atomic64_fetch_and(s64 i, atomic64_t *v)
>  
>  #endif /* atomic64_fetch_and_relaxed */
>  
> +#define arch_atomic64_andnot atomic64_andnot
> +
>  #ifndef atomic64_andnot
>  static __always_inline void
>  atomic64_andnot(s64 i, atomic64_t *v)
> @@ -1763,6 +1943,11 @@ atomic64_andnot(s64 i, atomic64_t *v)
>  #define atomic64_andnot atomic64_andnot
>  #endif
>  
> +#define arch_atomic64_fetch_andnot atomic64_fetch_andnot
> +#define arch_atomic64_fetch_andnot_acquire atomic64_fetch_andnot_acquire
> +#define arch_atomic64_fetch_andnot_release atomic64_fetch_andnot_release
> +#define arch_atomic64_fetch_andnot_relaxed atomic64_fetch_andnot_relaxed
> +
>  #ifndef atomic64_fetch_andnot_relaxed
>  #ifdef atomic64_fetch_andnot
>  #define atomic64_fetch_andnot_acquire atomic64_fetch_andnot
> @@ -1844,6 +2029,13 @@ atomic64_fetch_andnot(s64 i, atomic64_t
>  
>  #endif /* atomic64_fetch_andnot_relaxed */
>  
> +#define arch_atomic64_or atomic64_or
> +
> +#define arch_atomic64_fetch_or atomic64_fetch_or
> +#define arch_atomic64_fetch_or_acquire atomic64_fetch_or_acquire
> +#define arch_atomic64_fetch_or_release atomic64_fetch_or_release
> +#define arch_atomic64_fetch_or_relaxed atomic64_fetch_or_relaxed
> +
>  #ifndef atomic64_fetch_or_relaxed
>  #define atomic64_fetch_or_acquire atomic64_fetch_or
>  #define atomic64_fetch_or_release atomic64_fetch_or
> @@ -1886,6 +2078,13 @@ atomic64_fetch_or(s64 i, atomic64_t *v)
>  
>  #endif /* atomic64_fetch_or_relaxed */
>  
> +#define arch_atomic64_xor atomic64_xor
> +
> +#define arch_atomic64_fetch_xor atomic64_fetch_xor
> +#define arch_atomic64_fetch_xor_acquire atomic64_fetch_xor_acquire
> +#define arch_atomic64_fetch_xor_release atomic64_fetch_xor_release
> +#define arch_atomic64_fetch_xor_relaxed atomic64_fetch_xor_relaxed
> +
>  #ifndef atomic64_fetch_xor_relaxed
>  #define atomic64_fetch_xor_acquire atomic64_fetch_xor
>  #define atomic64_fetch_xor_release atomic64_fetch_xor
> @@ -1928,6 +2127,11 @@ atomic64_fetch_xor(s64 i, atomic64_t *v)
>  
>  #endif /* atomic64_fetch_xor_relaxed */
>  
> +#define arch_atomic64_xchg atomic64_xchg
> +#define arch_atomic64_xchg_acquire atomic64_xchg_acquire
> +#define arch_atomic64_xchg_release atomic64_xchg_release
> +#define arch_atomic64_xchg_relaxed atomic64_xchg_relaxed
> +
>  #ifndef atomic64_xchg_relaxed
>  #define atomic64_xchg_acquire atomic64_xchg
>  #define atomic64_xchg_release atomic64_xchg
> @@ -1970,6 +2174,11 @@ atomic64_xchg(atomic64_t *v, s64 i)
>  
>  #endif /* atomic64_xchg_relaxed */
>  
> +#define arch_atomic64_cmpxchg atomic64_cmpxchg
> +#define arch_atomic64_cmpxchg_acquire atomic64_cmpxchg_acquire
> +#define arch_atomic64_cmpxchg_release atomic64_cmpxchg_release
> +#define arch_atomic64_cmpxchg_relaxed atomic64_cmpxchg_relaxed
> +
>  #ifndef atomic64_cmpxchg_relaxed
>  #define atomic64_cmpxchg_acquire atomic64_cmpxchg
>  #define atomic64_cmpxchg_release atomic64_cmpxchg
> @@ -2012,6 +2221,11 @@ atomic64_cmpxchg(atomic64_t *v, s64 old,
>  
>  #endif /* atomic64_cmpxchg_relaxed */
>  
> +#define arch_atomic64_try_cmpxchg atomic64_try_cmpxchg
> +#define arch_atomic64_try_cmpxchg_acquire atomic64_try_cmpxchg_acquire
> +#define arch_atomic64_try_cmpxchg_release atomic64_try_cmpxchg_release
> +#define arch_atomic64_try_cmpxchg_relaxed atomic64_try_cmpxchg_relaxed
> +
>  #ifndef atomic64_try_cmpxchg_relaxed
>  #ifdef atomic64_try_cmpxchg
>  #define atomic64_try_cmpxchg_acquire atomic64_try_cmpxchg
> @@ -2109,6 +2323,8 @@ atomic64_try_cmpxchg(atomic64_t *v, s64
>  
>  #endif /* atomic64_try_cmpxchg_relaxed */
>  
> +#define arch_atomic64_sub_and_test atomic64_sub_and_test
> +
>  #ifndef atomic64_sub_and_test
>  /**
>   * atomic64_sub_and_test - subtract value from variable and test result
> @@ -2127,6 +2343,8 @@ atomic64_sub_and_test(s64 i, atomic64_t
>  #define atomic64_sub_and_test atomic64_sub_and_test
>  #endif
>  
> +#define arch_atomic64_dec_and_test atomic64_dec_and_test
> +
>  #ifndef atomic64_dec_and_test
>  /**
>   * atomic64_dec_and_test - decrement and test
> @@ -2144,6 +2362,8 @@ atomic64_dec_and_test(atomic64_t *v)
>  #define atomic64_dec_and_test atomic64_dec_and_test
>  #endif
>  
> +#define arch_atomic64_inc_and_test atomic64_inc_and_test
> +
>  #ifndef atomic64_inc_and_test
>  /**
>   * atomic64_inc_and_test - increment and test
> @@ -2161,6 +2381,8 @@ atomic64_inc_and_test(atomic64_t *v)
>  #define atomic64_inc_and_test atomic64_inc_and_test
>  #endif
>  
> +#define arch_atomic64_add_negative atomic64_add_negative
> +
>  #ifndef atomic64_add_negative
>  /**
>   * atomic64_add_negative - add and test if negative
> @@ -2179,6 +2401,8 @@ atomic64_add_negative(s64 i, atomic64_t
>  #define atomic64_add_negative atomic64_add_negative
>  #endif
>  
> +#define arch_atomic64_fetch_add_unless atomic64_fetch_add_unless
> +
>  #ifndef atomic64_fetch_add_unless
>  /**
>   * atomic64_fetch_add_unless - add unless the number is already a given value
> @@ -2204,6 +2428,8 @@ atomic64_fetch_add_unless(atomic64_t *v,
>  #define atomic64_fetch_add_unless atomic64_fetch_add_unless
>  #endif
>  
> +#define arch_atomic64_add_unless atomic64_add_unless
> +
>  #ifndef atomic64_add_unless
>  /**
>   * atomic64_add_unless - add unless the number is already a given value
> @@ -2222,6 +2448,8 @@ atomic64_add_unless(atomic64_t *v, s64 a
>  #define atomic64_add_unless atomic64_add_unless
>  #endif
>  
> +#define arch_atomic64_inc_not_zero atomic64_inc_not_zero
> +
>  #ifndef atomic64_inc_not_zero
>  /**
>   * atomic64_inc_not_zero - increment unless the number is zero
> @@ -2238,6 +2466,8 @@ atomic64_inc_not_zero(atomic64_t *v)
>  #define atomic64_inc_not_zero atomic64_inc_not_zero
>  #endif
>  
> +#define arch_atomic64_inc_unless_negative atomic64_inc_unless_negative
> +
>  #ifndef atomic64_inc_unless_negative
>  static __always_inline bool
>  atomic64_inc_unless_negative(atomic64_t *v)
> @@ -2254,6 +2484,8 @@ atomic64_inc_unless_negative(atomic64_t
>  #define atomic64_inc_unless_negative atomic64_inc_unless_negative
>  #endif
>  
> +#define arch_atomic64_dec_unless_positive atomic64_dec_unless_positive
> +
>  #ifndef atomic64_dec_unless_positive
>  static __always_inline bool
>  atomic64_dec_unless_positive(atomic64_t *v)
> @@ -2270,6 +2502,8 @@ atomic64_dec_unless_positive(atomic64_t
>  #define atomic64_dec_unless_positive atomic64_dec_unless_positive
>  #endif
>  
> +#define arch_atomic64_dec_if_positive atomic64_dec_if_positive
> +
>  #ifndef atomic64_dec_if_positive
>  static __always_inline s64
>  atomic64_dec_if_positive(atomic64_t *v)
> @@ -2288,4 +2522,4 @@ atomic64_dec_if_positive(atomic64_t *v)
>  #endif
>  
>  #endif /* _LINUX_ATOMIC_FALLBACK_H */
> -// 1fac0941c79bf0ae100723cc2ac9b94061f0b67a
> +// 9d95b56f98d82a2a26c7b79ccdd0c47572d50a6f
> --- a/scripts/atomic/gen-atomic-fallback.sh
> +++ b/scripts/atomic/gen-atomic-fallback.sh
> @@ -58,6 +58,21 @@ cat << EOF
>  EOF
>  }
>  
> +gen_proto_order_variant()
> +{
> +	local meta="$1"; shift
> +	local pfx="$1"; shift
> +	local name="$1"; shift
> +	local sfx="$1"; shift
> +	local order="$1"; shift
> +	local arch="$1"
> +	local atomic="$2"
> +
> +	local basename="${arch}${atomic}_${pfx}${name}${sfx}"
> +
> +	printf "#define arch_${basename}${order} ${basename}${order}\n"
> +}
> +
>  #gen_proto_order_variants(meta, pfx, name, sfx, arch, atomic, int, args...)
>  gen_proto_order_variants()
>  {
> @@ -72,6 +87,22 @@ gen_proto_order_variants()
>  
>  	local template="$(find_fallback_template "${pfx}" "${name}" "${sfx}" "${order}")"
>  
> +	if [ -z "$arch" ]; then
> +		gen_proto_order_variant "${meta}" "${pfx}" "${name}" "${sfx}" "" "$@"
> +
> +		if meta_has_acquire "${meta}"; then
> +			gen_proto_order_variant "${meta}" "${pfx}" "${name}" "${sfx}" "_acquire" "$@"
> +		fi
> +		if meta_has_release "${meta}"; then
> +			gen_proto_order_variant "${meta}" "${pfx}" "${name}" "${sfx}" "_release" "$@"
> +		fi
> +		if meta_has_relaxed "${meta}"; then
> +			gen_proto_order_variant "${meta}" "${pfx}" "${name}" "${sfx}" "_relaxed" "$@"
> +		fi
> +
> +		echo ""
> +	fi
> +
>  	# If we don't have relaxed atomics, then we don't bother with ordering fallbacks
>  	# read_acquire and set_release need to be templated, though
>  	if ! meta_has_relaxed "${meta}"; then