linux-kernel - Re: [paulmck-rcu:dev.2024.03.27b 64/69] arch/xtensa/include/asm/cmpxchg.h:77:25: error: implicit declaration of function 'cmpxchg_emu

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Date: Sun, 31 Mar 2024 23:53:12 +0800
From: Yujie Liu <yujie.liu@...el.com>
To: "Paul E. McKenney" <paulmck@...nel.org>
CC: kernel test robot <lkp@...el.com>, <oe-kbuild-all@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [paulmck-rcu:dev.2024.03.27b 64/69]
 arch/xtensa/include/asm/cmpxchg.h:77:25: error: implicit declaration of
 function 'cmpxchg_emu_u8'

On Fri, Mar 29, 2024 at 11:48:37AM -0700, Paul E. McKenney wrote:
> On Fri, Mar 29, 2024 at 11:08:04PM +0800, kernel test robot wrote:
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2024.03.27b
> > head:   786fab3085d764055a78edb54023420920344333
> > commit: b3b1a154281fc97efc4c1d5818a83c29c228dbd5 [64/69] xtensa: Emulate one-byte and two-byte cmpxchg
> > config: xtensa-allnoconfig (https://download.01.org/0day-ci/archive/20240329/202403292321.T55etywH-lkp@intel.com/config)
> > compiler: xtensa-linux-gcc (GCC) 13.2.0
> > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240329/202403292321.T55etywH-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@...el.com>
> > | Closes: https://lore.kernel.org/oe-kbuild-all/202403292321.T55etywH-lkp@intel.com/
> > 
> > All errors (new ones prefixed by >>):
> > 
> >    In file included from arch/xtensa/include/asm/atomic.h:19,
> >                     from include/linux/atomic.h:7,
> >                     from include/asm-generic/bitops/atomic.h:5,
> >                     from arch/xtensa/include/asm/bitops.h:192,
> >                     from include/linux/bitops.h:68,
> >                     from include/linux/log2.h:12,
> >                     from kernel/bounds.c:13:
> >    arch/xtensa/include/asm/cmpxchg.h: In function '__cmpxchg':
> > >> arch/xtensa/include/asm/cmpxchg.h:77:25: error: implicit declaration of function 'cmpxchg_emu_u8' [-Werror=implicit-function-declaration]
> >       77 |         case 1:  return cmpxchg_emu_u8((volatile u8 *)ptr, old, new);
> >          |                         ^~~~~~~~~~~~~~
> 
> Good catch!  Does the diff at the end fix this?

The error is fixed by the diff at the end.

Tested-by: Yujie Liu <yujie.liu@...el.com>

> 
> 							Thanx, Paul
> 
> > >> arch/xtensa/include/asm/cmpxchg.h:78:25: error: implicit declaration of function 'cmpxchg_emu_u16' [-Werror=implicit-function-declaration]
> >       78 |         case 2:  return cmpxchg_emu_u16((volatile u16 *)ptr, old, new);
> >          |                         ^~~~~~~~~~~~~~~
> >    cc1: some warnings being treated as errors
> >    make[3]: *** [scripts/Makefile.build:117: kernel/bounds.s] Error 1
> >    make[3]: Target 'prepare' not remade because of errors.
> >    make[2]: *** [Makefile:1197: prepare0] Error 2
> >    make[2]: Target 'prepare' not remade because of errors.
> >    make[1]: *** [Makefile:240: __sub-make] Error 2
> >    make[1]: Target 'prepare' not remade because of errors.
> >    make: *** [Makefile:240: __sub-make] Error 2
> >    make: Target 'prepare' not remade because of errors.
> > 
> > 
> > vim +/cmpxchg_emu_u8 +77 arch/xtensa/include/asm/cmpxchg.h
> > 
> >     72	
> >     73	static __inline__ unsigned long
> >     74	__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
> >     75	{
> >     76		switch (size) {
> >   > 77		case 1:  return cmpxchg_emu_u8((volatile u8 *)ptr, old, new);
> >   > 78		case 2:  return cmpxchg_emu_u16((volatile u16 *)ptr, old, new);
> >     79		case 4:  return __cmpxchg_u32(ptr, old, new);
> >     80		default: __cmpxchg_called_with_bad_pointer();
> >     81			 return old;
> >     82		}
> >     83	}
> >     84	
> > 
> > -- 
> > 0-DAY CI Kernel Test Service
> > https://github.com/intel/lkp-tests/wiki
> 
> commit 663161aaa5c3286dcfc9ba2cd9e12170f9354ea7
> Author: Paul E. McKenney <paulmck@...nel.org>
> Date:   Fri Mar 29 11:47:13 2024 -0700
> 
>     squash! xtensa: Emulate one-byte and two-byte cmpxchg
>     
>     [ paulmck: Apply kernel test robot feedback. ]
>     
>     Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
> 
> diff --git a/arch/xtensa/include/asm/cmpxchg.h b/arch/xtensa/include/asm/cmpxchg.h
> index bcce915a98e21..a0f9a2070209b 100644
> --- a/arch/xtensa/include/asm/cmpxchg.h
> +++ b/arch/xtensa/include/asm/cmpxchg.h
> @@ -15,6 +15,7 @@
>  
>  #include <linux/bits.h>
>  #include <linux/stringify.h>
> +#include <linux/cmpxchg-emu.h>
>  
>  /*
>   * cmpxchg
>