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Message-ID: <202505230141.4YBHhrPI-lkp@intel.com>
Date: Fri, 23 May 2025 01:20:32 +0800
From: kernel test robot <lkp@...el.com>
To: "Xin Li (Intel)" <xin@...or.com>, linux-kernel@...r.kernel.org
Cc: oe-kbuild-all@...ts.linux.dev, tglx@...utronix.de, mingo@...hat.com,
bp@...en8.de, dave.hansen@...ux.intel.com, x86@...nel.org,
hpa@...or.com, peterz@...radead.org, andrew.cooper3@...rix.com,
stable@...r.kernel.org
Subject: Re: [PATCH v1 1/1] x86/fred/signal: Prevent single-step upon ERETU
completion
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@...el.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;
| ^~
vim +44 arch/x86/include/asm/sighandling.h
26
27 /*
28 * To prevent infinite SIGTRAP handler loop if TF is used without an external
29 * debugger, clear the software event flag in the augmented SS, ensuring no
30 * single-step trap is pending upon ERETU completion.
31 *
32 * Note, this function should be called in sigreturn() before the original state
33 * is restored to make sure the TF is read from the entry frame.
34 */
35 static __always_inline void prevent_single_step_upon_eretu(struct pt_regs *regs)
36 {
37 /*
38 * If the trap flag (TF) is set, i.e., the sigreturn() SYSCALL instruction
39 * is being single-stepped, do not clear the software event flag in the
40 * augmented SS, thus a debugger won't skip over the following instruction.
41 */
42 if (IS_ENABLED(CONFIG_X86_FRED) && cpu_feature_enabled(X86_FEATURE_FRED) &&
43 !(regs->flags & X86_EFLAGS_TF))
> 44 regs->fred_ss.swevent = 0;
45 }
46
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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