linux-kernel - Re: [PATCH v1 1/1] serial: 8250_platform: Explicitly show we initialise ISA ports only once

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Message-ID: <ZmhzZJdK9IgBYauE@smile.fi.intel.com>
Date: Tue, 11 Jun 2024 18:55:16 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: kernel test robot <lkp@...el.com>,
	Youling Tang <tangyouling@...ngson.cn>,
	Huacai Chen <chenhuacai@...ngson.cn>
Cc: linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	oe-kbuild-all@...ts.linux.dev,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>,
	Sean Christopherson <seanjc@...gle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v1 1/1] serial: 8250_platform: Explicitly show we
 initialise ISA ports only once

+Cc: initial authors of Loongarch64 jump table implementation and people who touched that code.

On Fri, Jun 07, 2024 at 09:48:51PM +0800, kernel test robot wrote:
> Hi Andy,
> 
> kernel test robot noticed the following build warnings:
> 
> [auto build test WARNING on tty/tty-testing]
> [also build test WARNING on tty/tty-next next-20240607]
> [cannot apply to tty/tty-linus linus/master v6.10-rc2]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Andy-Shevchenko/serial-8250_platform-Explicitly-show-we-initialise-ISA-ports-only-once/20240607-025109
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git tty-testing
> patch link:    https://lore.kernel.org/r/20240606184841.3102545-1-andriy.shevchenko%40linux.intel.com
> patch subject: [PATCH v1 1/1] serial: 8250_platform: Explicitly show we initialise ISA ports only once
> config: loongarch-defconfig (https://download.01.org/0day-ci/archive/20240607/202406072102.SGp8FYYi-lkp@intel.com/config)
> compiler: loongarch64-linux-gcc (GCC) 13.2.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240607/202406072102.SGp8FYYi-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/202406072102.SGp8FYYi-lkp@intel.com/
> 
> All warnings (new ones prefixed by >>):
> 
> >> drivers/tty/serial/8250/8250_platform.o: warning: objtool: __jump_table+0x0: special: can't find orig instruction
> 
> objdump-func vmlinux.o __jump_table:

Folks, can you look into it? It sounds like jump table is misimplemented for
this architecture (but I'm quite unsure). Similar issue LKP reported here:
https://lore.kernel.org/all/202405290629.oaN9XxEz-lkp@intel.com/

P.S. Is it objtool issue or kernel issue? (Just thinking/questioning loudly)

-- 
With Best Regards,
Andy Shevchenko