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Date: Fri, 29 Mar 2024 23:08:05 +0800
From: kernel test robot <lkp@intel.com>
To: "Paul E. McKenney" <paulmck@kernel.org>
Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev,
	linux-kernel@vger.kernel.org
Subject: [paulmck-rcu:dev.2024.03.27b 66/69]
 include/linux/atomic/atomic-arch-fallback.h:2026:9: error: call to
 undeclared function 'cmpxchg_emu_u8'; ISO C99 and later do not support
 implicit function declarations
Message-ID: <202403292322.bwguovKc-lkp@intel.com>
Precedence: bulk
MIME-Version: 1.0
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Content-Disposition: inline

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2024.03.27b
head:   786fab3085d764055a78edb54023420920344333
commit: 032d9f7e1213171131a3f45c5c532ea5d11b4b9a [66/69] riscv: Emulate one-byte and two-byte cmpxchg
config: riscv-defconfig (https://download.01.org/0day-ci/archive/20240329/202403292322.bwguovKc-lkp@intel.com/config)
compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project 79ba323bdd0843275019e16b6e9b35133677c514)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240329/202403292322.bwguovKc-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202403292322.bwguovKc-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/riscv/kernel/asm-offsets.c:10:
   In file included from include/linux/mm.h:7:
   In file included from include/linux/gfp.h:7:
   In file included from include/linux/mmzone.h:8:
   In file included from include/linux/spinlock.h:63:
   In file included from include/linux/lockdep.h:14:
   In file included from include/linux/smp.h:13:
   In file included from include/linux/cpumask.h:14:
   In file included from include/linux/atomic.h:80:
>> include/linux/atomic/atomic-arch-fallback.h:2026:9: error: call to undeclared function 'cmpxchg_emu_u8'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    2026 |         return raw_cmpxchg(&v->counter, old, new);
         |                ^
   include/linux/atomic/atomic-arch-fallback.h:55:21: note: expanded from macro 'raw_cmpxchg'
      55 | #define raw_cmpxchg arch_cmpxchg
         |                     ^
   arch/riscv/include/asm/cmpxchg.h:367:23: note: expanded from macro 'arch_cmpxchg'
     367 |         (__typeof__(*(ptr))) __cmpxchg((ptr),                           \
         |                              ^
   arch/riscv/include/asm/cmpxchg.h:328:11: note: expanded from macro '__cmpxchg'
     328 |                 __ret = cmpxchg_emu_u8((volatile u8 *)__ptr, __old, __new); \
         |                         ^
   In file included from arch/riscv/kernel/asm-offsets.c:10:
   In file included from include/linux/mm.h:7:
   In file included from include/linux/gfp.h:7:
   In file included from include/linux/mmzone.h:8:
   In file included from include/linux/spinlock.h:63:
   In file included from include/linux/lockdep.h:14:
   In file included from include/linux/smp.h:13:
   In file included from include/linux/cpumask.h:14:
   In file included from include/linux/atomic.h:80:
>> include/linux/atomic/atomic-arch-fallback.h:2026:9: error: call to undeclared function 'cmpxchg_emu_u16'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
   include/linux/atomic/atomic-arch-fallback.h:55:21: note: expanded from macro 'raw_cmpxchg'
      55 | #define raw_cmpxchg arch_cmpxchg
         |                     ^
   arch/riscv/include/asm/cmpxchg.h:367:23: note: expanded from macro 'arch_cmpxchg'
     367 |         (__typeof__(*(ptr))) __cmpxchg((ptr),                           \
         |                              ^
   arch/riscv/include/asm/cmpxchg.h:332:11: note: expanded from macro '__cmpxchg'
     332 |                 __ret = cmpxchg_emu_u16((volatile u16 *)__ptr, __old, __new); \
         |                         ^
   In file included from arch/riscv/kernel/asm-offsets.c:10:
   In file included from include/linux/mm.h:7:
   In file included from include/linux/gfp.h:7:
   In file included from include/linux/mmzone.h:8:
   In file included from include/linux/spinlock.h:63:
   In file included from include/linux/lockdep.h:14:
   In file included from include/linux/smp.h:13:
   In file included from include/linux/cpumask.h:14:
   In file included from include/linux/atomic.h:80:
   include/linux/atomic/atomic-arch-fallback.h:2055:9: error: call to undeclared function 'cmpxchg_emu_u8'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    2055 |         return raw_cmpxchg_acquire(&v->counter, old, new);
         |                ^
   include/linux/atomic/atomic-arch-fallback.h:65:29: note: expanded from macro 'raw_cmpxchg_acquire'
      65 | #define raw_cmpxchg_acquire arch_cmpxchg_acquire
         |                             ^
   arch/riscv/include/asm/cmpxchg.h:263:23: note: expanded from macro 'arch_cmpxchg_acquire'
     263 |         (__typeof__(*(ptr))) __cmpxchg_acquire((ptr),                   \
         |                              ^
   arch/riscv/include/asm/cmpxchg.h:224:11: note: expanded from macro '__cmpxchg_acquire'
     224 |                 __ret = cmpxchg_emu_u8((volatile u8 *)__ptr, __old, __new); \
         |                         ^
   In file included from arch/riscv/kernel/asm-offsets.c:10:
   In file included from include/linux/mm.h:7:
   In file included from include/linux/gfp.h:7:
   In file included from include/linux/mmzone.h:8:
   In file included from include/linux/spinlock.h:63:
   In file included from include/linux/lockdep.h:14:
   In file included from include/linux/smp.h:13:
   In file included from include/linux/cpumask.h:14:
   In file included from include/linux/atomic.h:80:
   include/linux/atomic/atomic-arch-fallback.h:2055:9: error: call to undeclared function 'cmpxchg_emu_u16'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
   include/linux/atomic/atomic-arch-fallback.h:65:29: note: expanded from macro 'raw_cmpxchg_acquire'
      65 | #define raw_cmpxchg_acquire arch_cmpxchg_acquire
         |                             ^
   arch/riscv/include/asm/cmpxchg.h:263:23: note: expanded from macro 'arch_cmpxchg_acquire'
     263 |         (__typeof__(*(ptr))) __cmpxchg_acquire((ptr),                   \
         |                              ^
   arch/riscv/include/asm/cmpxchg.h:228:11: note: expanded from macro '__cmpxchg_acquire'
     228 |                 __ret = cmpxchg_emu_u16((volatile u16 *)__ptr, __old, __new); \
         |                         ^
   In file included from arch/riscv/kernel/asm-offsets.c:10:
   In file included from include/linux/mm.h:7:
   In file included from include/linux/gfp.h:7:
   In file included from include/linux/mmzone.h:8:
   In file included from include/linux/spinlock.h:63:
   In file included from include/linux/lockdep.h:14:
   In file included from include/linux/smp.h:13:
   In file included from include/linux/cpumask.h:14:
   In file included from include/linux/atomic.h:80:
   include/linux/atomic/atomic-arch-fallback.h:2083:9: error: call to undeclared function 'cmpxchg_emu_u8'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    2083 |         return raw_cmpxchg_release(&v->counter, old, new);
         |                ^
   include/linux/atomic/atomic-arch-fallback.h:77:29: note: expanded from macro 'raw_cmpxchg_release'
      77 | #define raw_cmpxchg_release arch_cmpxchg_release
         |                             ^
   arch/riscv/include/asm/cmpxchg.h:315:23: note: expanded from macro 'arch_cmpxchg_release'
     315 |         (__typeof__(*(ptr))) __cmpxchg_release((ptr),                   \
         |                              ^
   arch/riscv/include/asm/cmpxchg.h:276:11: note: expanded from macro '__cmpxchg_release'
     276 |                 __ret = cmpxchg_emu_u8((volatile u8 *)__ptr, __old, __new); \
         |                         ^
   In file included from arch/riscv/kernel/asm-offsets.c:10:
   In file included from include/linux/mm.h:7:
   In file included from include/linux/gfp.h:7:
   In file included from include/linux/mmzone.h:8:
   In file included from include/linux/spinlock.h:63:
   In file included from include/linux/lockdep.h:14:
   In file included from include/linux/smp.h:13:
   In file included from include/linux/cpumask.h:14:
   In file included from include/linux/atomic.h:80:
   include/linux/atomic/atomic-arch-fallback.h:2083:9: error: call to undeclared function 'cmpxchg_emu_u16'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
   include/linux/atomic/atomic-arch-fallback.h:77:29: note: expanded from macro 'raw_cmpxchg_release'
      77 | #define raw_cmpxchg_release arch_cmpxchg_release
         |                             ^
   arch/riscv/include/asm/cmpxchg.h:315:23: note: expanded from macro 'arch_cmpxchg_release'
     315 |         (__typeof__(*(ptr))) __cmpxchg_release((ptr),                   \
         |                              ^
   arch/riscv/include/asm/cmpxchg.h:280:11: note: expanded from macro '__cmpxchg_release'
     280 |                 __ret = cmpxchg_emu_u16((volatile u16 *)__ptr, __old, __new); \
         |                         ^
   In file included from arch/riscv/kernel/asm-offsets.c:10:
   In file included from include/linux/mm.h:7:
   In file included from include/linux/gfp.h:7:
   In file included from include/linux/mmzone.h:8:
   In file included from include/linux/spinlock.h:63:
   In file included from include/linux/lockdep.h:14:
   In file included from include/linux/smp.h:13:
   In file included from include/linux/cpumask.h:14:
   In file included from include/linux/atomic.h:80:
   include/linux/atomic/atomic-arch-fallback.h:2108:9: error: call to undeclared function 'cmpxchg_emu_u8'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    2108 |         return raw_cmpxchg_relaxed(&v->counter, old, new);


vim +/cmpxchg_emu_u8 +2026 include/linux/atomic/atomic-arch-fallback.h

37f8173dd84936 include/linux/atomic-arch-fallback.h        Peter Zijlstra 2020-01-24  2000  
ad8110706f3811 include/linux/atomic/atomic-arch-fallback.h Mark Rutland   2023-06-05  2001  /**
ad8110706f3811 include/linux/atomic/atomic-arch-fallback.h Mark Rutland   2023-06-05  2002   * raw_atomic_cmpxchg() - atomic compare and exchange with full ordering
ad8110706f3811 include/linux/atomic/atomic-arch-fallback.h Mark Rutland   2023-06-05  2003   * @v: pointer to atomic_t
ad8110706f3811 include/linux/atomic/atomic-arch-fallback.h Mark Rutland   2023-06-05  2004   * @old: int value to compare with
ad8110706f3811 include/linux/atomic/atomic-arch-fallback.h Mark Rutland   2023-06-05  2005   * @new: int value to assign
ad8110706f3811 include/linux/atomic/atomic-arch-fallback.h Mark Rutland   2023-06-05  2006   *
ad8110706f3811 include/linux/atomic/atomic-arch-fallback.h Mark Rutland   2023-06-05  2007   * If (@v == @old), atomically updates @v to @new with full ordering.
6dfee110c6cc7a include/linux/atomic/atomic-arch-fallback.h Mark Rutland   2024-02-09  2008   * Otherwise, @v is not modified and relaxed ordering is provided.
ad8110706f3811 include/linux/atomic/atomic-arch-fallback.h Mark Rutland   2023-06-05  2009   *
ad8110706f3811 include/linux/atomic/atomic-arch-fallback.h Mark Rutland   2023-06-05  2010   * Safe to use in noinstr code; prefer atomic_cmpxchg() elsewhere.
ad8110706f3811 include/linux/atomic/atomic-arch-fallback.h Mark Rutland   2023-06-05  2011   *
ad8110706f3811 include/linux/atomic/atomic-arch-fallback.h Mark Rutland   2023-06-05  2012   * Return: The original value of @v.
ad8110706f3811 include/linux/atomic/atomic-arch-fallback.h Mark Rutland   2023-06-05  2013   */
37f8173dd84936 include/linux/atomic-arch-fallback.h        Peter Zijlstra 2020-01-24  2014  static __always_inline int
9257959a6e5b4f include/linux/atomic/atomic-arch-fallback.h Mark Rutland   2023-06-05  2015  raw_atomic_cmpxchg(atomic_t *v, int old, int new)
37f8173dd84936 include/linux/atomic-arch-fallback.h        Peter Zijlstra 2020-01-24  2016  {
1d78814d41701c include/linux/atomic/atomic-arch-fallback.h Mark Rutland   2023-06-05  2017  #if defined(arch_atomic_cmpxchg)
1d78814d41701c include/linux/atomic/atomic-arch-fallback.h Mark Rutland   2023-06-05  2018  	return arch_atomic_cmpxchg(v, old, new);
1d78814d41701c include/linux/atomic/atomic-arch-fallback.h Mark Rutland   2023-06-05  2019  #elif defined(arch_atomic_cmpxchg_relaxed)
37f8173dd84936 include/linux/atomic-arch-fallback.h        Peter Zijlstra 2020-01-24  2020  	int ret;
37f8173dd84936 include/linux/atomic-arch-fallback.h        Peter Zijlstra 2020-01-24  2021  	__atomic_pre_full_fence();
9257959a6e5b4f include/linux/atomic/atomic-arch-fallback.h Mark Rutland   2023-06-05  2022  	ret = arch_atomic_cmpxchg_relaxed(v, old, new);
37f8173dd84936 include/linux/atomic-arch-fallback.h        Peter Zijlstra 2020-01-24  2023  	__atomic_post_full_fence();
37f8173dd84936 include/linux/atomic-arch-fallback.h        Peter Zijlstra 2020-01-24  2024  	return ret;
9257959a6e5b4f include/linux/atomic/atomic-arch-fallback.h Mark Rutland   2023-06-05  2025  #else
9257959a6e5b4f include/linux/atomic/atomic-arch-fallback.h Mark Rutland   2023-06-05 @2026  	return raw_cmpxchg(&v->counter, old, new);
d12157efc8e083 include/linux/atomic/atomic-arch-fallback.h Mark Rutland   2023-06-05  2027  #endif
1d78814d41701c include/linux/atomic/atomic-arch-fallback.h Mark Rutland   2023-06-05  2028  }
d12157efc8e083 include/linux/atomic/atomic-arch-fallback.h Mark Rutland   2023-06-05  2029  

:::::: The code at line 2026 was first introduced by commit
:::::: 9257959a6e5b4fca6fc8e985790bff62c2046f20 locking/atomic: scripts: restructure fallback ifdeffery

:::::: TO: Mark Rutland <mark.rutland@arm.com>
:::::: CC: Peter Zijlstra <peterz@infradead.org>

-- 
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https://github.com/intel/lkp-tests/wiki