From: kernel test robot <lkp@intel.com>
To: oe-kbuild@lists.linux.dev
Cc: lkp@intel.com
Subject: [android-common:android13-5.10 1/1] arch/x86/kernel/static_call.c:19:17: warning: 'tramp_ud' defined but not used
Date: Sat, 19 Sep 2026 16:28:02 +0800 [thread overview]
Message-ID: <202609191635.PJEhAHNl-lkp@intel.com> (raw)
::::::
:::::: Manual check reason: "extra build warning to Peter Zijlstra"
::::::
BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
TO: cros-kernel-buildreports@googlegroups.com
Hi Peter,
FYI, the error/warning still remains.
tree: https://android.googlesource.com/kernel/common android13-5.10
head: 428b47f4651829663d19455bcf5132040b155e86
commit: 7723edf5edfdfdabd8234e45142be86598a04cad [1/1] x86,static_call: Use alternative RET encoding
:::::: branch date: 33 hours ago
:::::: commit date: 4 years, 2 months ago
config: i386-randconfig-r1307-20260917 (https://download.01.org/0day-ci/archive/20260919/202609191635.PJEhAHNl-lkp@intel.com/config)
compiler: gcc-13 (Debian 13.3.0-16) 13.3.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260919/202609191635.PJEhAHNl-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/r/202609191635.PJEhAHNl-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> arch/x86/kernel/static_call.c:19:17: warning: 'tramp_ud' defined but not used [-Wunused-const-variable=]
19 | static const u8 tramp_ud[] = { 0x0f, 0xb9, 0xcc };
| ^~~~~~~~
vim +/tramp_ud +19 arch/x86/kernel/static_call.c
452cddbff74b6a Peter Zijlstra 2020-08-18 13
7723edf5edfdfd Peter Zijlstra 2022-06-14 14 /*
7723edf5edfdfd Peter Zijlstra 2022-06-14 15 * ud1 %esp, %ecx - a 3 byte #UD that is unique to trampolines, chosen such
7723edf5edfdfd Peter Zijlstra 2022-06-14 16 * that there is no false-positive trampoline identification while also being a
7723edf5edfdfd Peter Zijlstra 2022-06-14 17 * speculation stop.
7723edf5edfdfd Peter Zijlstra 2022-06-14 18 */
7723edf5edfdfd Peter Zijlstra 2022-06-14 @19 static const u8 tramp_ud[] = { 0x0f, 0xb9, 0xcc };
7723edf5edfdfd Peter Zijlstra 2022-06-14 20
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
next reply other threads:[~2026-09-19 8:28 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-19 8:28 kernel test robot [this message]
-- strict thread matches above, loose matches on Subject: below --
2026-09-19 10:46 [android-common:android13-5.10 1/1] arch/x86/kernel/static_call.c:19:17: warning: 'tramp_ud' defined but not used kernel test robot
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