linux-kernel - Re: drivers/i3c/internals.h:54:9: error: passing 'const void *' to parameter of type 'void *' discards qualifiers

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Message-ID: <202509212148052be5ea9d@mail.local>
Date: Sun, 21 Sep 2025 23:48:05 +0200
From: Alexandre Belloni <alexandre.belloni@...tlin.com>
To: kernel test robot <lkp@...el.com>
Cc: Wolfram Sang <wsa-dev@...g-engineering.com>, llvm@...ts.linux.dev,
	oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Frank Li <Frank.Li@....com>
Subject: Re: drivers/i3c/internals.h:54:9: error: passing 'const void *' to
 parameter of type 'void *' discards qualifiers

Hello,

On 21/09/2025 23:54:32+0800, kernel test robot wrote:
> Hi Wolfram,
> 
> FYI, the error/warning still remains.
> 

As replied multiple times, the error is in the sparc64 code, not i3c.

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   f975f08c2e899ae2484407d7bba6bb7f8b6d9d40
> commit: 3b661ca549b9e5bb11d0bc97ada6110aac3282d2 i3c: add missing include to internal header
> date:   8 weeks ago
> config: sparc64-randconfig-001-20250921 (https://download.01.org/0day-ci/archive/20250921/202509212320.yCuqvnVn-lkp@intel.com/config)
> compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 7c861bcedf61607b6c087380ac711eb7ff918ca6)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250921/202509212320.yCuqvnVn-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/202509212320.yCuqvnVn-lkp@intel.com/
> 
> All errors (new ones prefixed by >>):
> 
>    In file included from drivers/i3c/master.c:21:
> >> drivers/i3c/internals.h:54:9: error: passing 'const void *' to parameter of type 'void *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
>       54 |         readsl(addr, buf, nbytes / 4);
>          |                ^~~~
>    arch/sparc/include/asm/io_64.h:265:41: note: passing argument to parameter 'port' here
>      265 | static inline void readsl(void __iomem *port, void *buf, unsigned long count)
>          |                                         ^
>    1 error generated.
> 
> 
> vim +54 drivers/i3c/internals.h
> 
> 733b439375b494 Jorge Marques 2025-06-24  44  
> 733b439375b494 Jorge Marques 2025-06-24  45  /**
> 733b439375b494 Jorge Marques 2025-06-24  46   * i3c_readl_fifo - Read data buffer from 32bit FIFO
> 733b439375b494 Jorge Marques 2025-06-24  47   * @addr: FIFO Address to read from
> 733b439375b494 Jorge Marques 2025-06-24  48   * @buf: Pointer to the buffer to store read bytes
> 733b439375b494 Jorge Marques 2025-06-24  49   * @nbytes: Number of bytes to read
> 733b439375b494 Jorge Marques 2025-06-24  50   */
> 733b439375b494 Jorge Marques 2025-06-24  51  static inline void i3c_readl_fifo(const void __iomem *addr, void *buf,
> 733b439375b494 Jorge Marques 2025-06-24  52  				  int nbytes)
> 733b439375b494 Jorge Marques 2025-06-24  53  {
> 733b439375b494 Jorge Marques 2025-06-24 @54  	readsl(addr, buf, nbytes / 4);
> 733b439375b494 Jorge Marques 2025-06-24  55  	if (nbytes & 3) {
> 733b439375b494 Jorge Marques 2025-06-24  56  		u32 tmp;
> 733b439375b494 Jorge Marques 2025-06-24  57  
> 733b439375b494 Jorge Marques 2025-06-24  58  		tmp = readl(addr);
> 733b439375b494 Jorge Marques 2025-06-24  59  		memcpy(buf + (nbytes & ~3), &tmp, nbytes & 3);
> 733b439375b494 Jorge Marques 2025-06-24  60  	}
> 733b439375b494 Jorge Marques 2025-06-24  61  }
> 733b439375b494 Jorge Marques 2025-06-24  62  
> 
> :::::: The code at line 54 was first introduced by commit
> :::::: 733b439375b494e8a6950ab47d18a4b615b73cb3 i3c: master: Add inline i3c_readl_fifo() and i3c_writel_fifo()
> 
> :::::: TO: Jorge Marques <jorge.marques@...log.com>
> :::::: CC: Alexandre Belloni <alexandre.belloni@...tlin.com>
> 
> -- 
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com