Re: [PATCH v1 1/1] x86/fred/signal: Prevent single-step upon ERETU completion

[Xin Li <xin@zytor.com>]

On 5/22/2025 10:20 AM, kernel test robot wrote:
> Hi Xin,
> 
> kernel test robot noticed the following build errors:
> 
> [auto build test ERROR on 6a7c3c2606105a41dde81002c0037420bc1ddf00]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Xin-Li-Intel/x86-fred-signal-Prevent-single-step-upon-ERETU-completion/20250522-140954
> base:   6a7c3c2606105a41dde81002c0037420bc1ddf00
> patch link:    https://lore.kernel.org/r/20250522060549.2882444-1-xin%40zytor.com
> patch subject: [PATCH v1 1/1] x86/fred/signal: Prevent single-step upon ERETU completion
> config: i386-buildonly-randconfig-003-20250522 (https://download.01.org/0day-ci/archive/20250523/202505230141.4YBHhrPI-lkp@intel.com/config)
> compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250523/202505230141.4YBHhrPI-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/202505230141.4YBHhrPI-lkp@intel.com/
> 
> All errors (new ones prefixed by >>):
> 
>     In file included from arch/x86/kernel/signal_32.c:32:
>     arch/x86/include/asm/sighandling.h: In function 'prevent_single_step_upon_eretu':
>>> arch/x86/include/asm/sighandling.h:44:21: error: 'struct pt_regs' has no member named 'fred_ss'
>        44 |                 regs->fred_ss.swevent = 0;
>           |                     ^~
> 

Hmm, this statement is under IS_ENABLED(CONFIG_X86_FRED), which should
be a compile time FALSE with i386.  Why it is still being compiled?

Thanks!
     Xin