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Message-ID: <202511281049.oCzxmRVJ-lkp@intel.com>
Date: Fri, 28 Nov 2025 10:41:17 +0800
From: kernel test robot <lkp@...el.com>
To: Osama Abdelkader <osama.abdelkader@...il.com>, catalin.marinas@....com,
will@...nel.org, mark.rutland@....com, ada.coupriediaz@....com,
smostafa@...gle.com
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Osama Abdelkader <osama.abdelkader@...il.com>
Subject: Re: [PATCH] arm64: Remove unreachable break after die
Hi Osama,
kernel test robot noticed the following build warnings:
[auto build test WARNING on arm64/for-next/core]
[also build test WARNING on linus/master v6.18-rc7 next-20251127]
[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/Osama-Abdelkader/arm64-Remove-unreachable-break-after-die/20251127-062758
base: https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
patch link: https://lore.kernel.org/r/20251126222620.215245-1-osama.abdelkader%40gmail.com
patch subject: [PATCH] arm64: Remove unreachable break after die
config: arm64-randconfig-001-20251128 (https://download.01.org/0day-ci/archive/20251128/202511281049.oCzxmRVJ-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project b3428bb966f1de8aa48375ffee0eba04ede133b7)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251128/202511281049.oCzxmRVJ-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/202511281049.oCzxmRVJ-lkp@intel.com/
All warnings (new ones prefixed by >>):
| ^~~~~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:833:28: note: previous initialization is here
833 | [0 ... ESR_ELx_EC_MAX] = "UNRECOGNIZED EC",
| ^~~~~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:862:27: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
862 | [ESR_ELx_EC_DABT_CUR] = "DABT (current EL)",
| ^~~~~~~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:833:28: note: previous initialization is here
833 | [0 ... ESR_ELx_EC_MAX] = "UNRECOGNIZED EC",
| ^~~~~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:863:27: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
863 | [ESR_ELx_EC_SP_ALIGN] = "SP Alignment",
| ^~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:833:28: note: previous initialization is here
833 | [0 ... ESR_ELx_EC_MAX] = "UNRECOGNIZED EC",
| ^~~~~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:864:23: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
864 | [ESR_ELx_EC_MOPS] = "MOPS",
| ^~~~~~
arch/arm64/kernel/traps.c:833:28: note: previous initialization is here
833 | [0 ... ESR_ELx_EC_MAX] = "UNRECOGNIZED EC",
| ^~~~~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:865:27: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
865 | [ESR_ELx_EC_FP_EXC32] = "FP (AArch32)",
| ^~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:833:28: note: previous initialization is here
833 | [0 ... ESR_ELx_EC_MAX] = "UNRECOGNIZED EC",
| ^~~~~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:866:27: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
866 | [ESR_ELx_EC_FP_EXC64] = "FP (AArch64)",
| ^~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:833:28: note: previous initialization is here
833 | [0 ... ESR_ELx_EC_MAX] = "UNRECOGNIZED EC",
| ^~~~~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:867:22: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
867 | [ESR_ELx_EC_GCS] = "Guarded Control Stack",
| ^~~~~~~~~~~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:833:28: note: previous initialization is here
833 | [0 ... ESR_ELx_EC_MAX] = "UNRECOGNIZED EC",
| ^~~~~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:868:25: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
868 | [ESR_ELx_EC_SERROR] = "SError",
| ^~~~~~~~
arch/arm64/kernel/traps.c:833:28: note: previous initialization is here
833 | [0 ... ESR_ELx_EC_MAX] = "UNRECOGNIZED EC",
| ^~~~~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:869:29: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
869 | [ESR_ELx_EC_BREAKPT_LOW] = "Breakpoint (lower EL)",
| ^~~~~~~~~~~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:833:28: note: previous initialization is here
833 | [0 ... ESR_ELx_EC_MAX] = "UNRECOGNIZED EC",
| ^~~~~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:870:29: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
870 | [ESR_ELx_EC_BREAKPT_CUR] = "Breakpoint (current EL)",
| ^~~~~~~~~~~~~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:833:28: note: previous initialization is here
833 | [0 ... ESR_ELx_EC_MAX] = "UNRECOGNIZED EC",
| ^~~~~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:871:29: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
871 | [ESR_ELx_EC_SOFTSTP_LOW] = "Software Step (lower EL)",
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:833:28: note: previous initialization is here
833 | [0 ... ESR_ELx_EC_MAX] = "UNRECOGNIZED EC",
| ^~~~~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:872:29: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
872 | [ESR_ELx_EC_SOFTSTP_CUR] = "Software Step (current EL)",
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:833:28: note: previous initialization is here
833 | [0 ... ESR_ELx_EC_MAX] = "UNRECOGNIZED EC",
| ^~~~~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:873:29: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
873 | [ESR_ELx_EC_WATCHPT_LOW] = "Watchpoint (lower EL)",
| ^~~~~~~~~~~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:833:28: note: previous initialization is here
833 | [0 ... ESR_ELx_EC_MAX] = "UNRECOGNIZED EC",
| ^~~~~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:874:29: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
874 | [ESR_ELx_EC_WATCHPT_CUR] = "Watchpoint (current EL)",
| ^~~~~~~~~~~~~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:833:28: note: previous initialization is here
833 | [0 ... ESR_ELx_EC_MAX] = "UNRECOGNIZED EC",
| ^~~~~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:875:25: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
875 | [ESR_ELx_EC_BKPT32] = "BKPT (AArch32)",
| ^~~~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:833:28: note: previous initialization is here
833 | [0 ... ESR_ELx_EC_MAX] = "UNRECOGNIZED EC",
| ^~~~~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:876:27: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
876 | [ESR_ELx_EC_VECTOR32] = "Vector catch (AArch32)",
| ^~~~~~~~~~~~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:833:28: note: previous initialization is here
833 | [0 ... ESR_ELx_EC_MAX] = "UNRECOGNIZED EC",
| ^~~~~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:877:24: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
877 | [ESR_ELx_EC_BRK64] = "BRK (AArch64)",
| ^~~~~~~~~~~~~~~
arch/arm64/kernel/traps.c:833:28: note: previous initialization is here
833 | [0 ... ESR_ELx_EC_MAX] = "UNRECOGNIZED EC",
| ^~~~~~~~~~~~~~~~~
>> arch/arm64/kernel/traps.c:1007:2: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
1007 | case BUG_TRAP_TYPE_WARN:
| ^
arch/arm64/kernel/traps.c:1007:2: note: insert 'break;' to avoid fall-through
1007 | case BUG_TRAP_TYPE_WARN:
| ^
| break;
45 warnings generated.
vim +1007 arch/arm64/kernel/traps.c
9fb7410f955f7a Dave P Martin 2015-07-24 1000
6adfdc5e2ef9c7 Ada Couprie Diaz 2025-07-07 1001 int bug_brk_handler(struct pt_regs *regs, unsigned long esr)
9fb7410f955f7a Dave P Martin 2015-07-24 1002 {
9fb7410f955f7a Dave P Martin 2015-07-24 1003 switch (report_bug(regs->pc, regs)) {
9fb7410f955f7a Dave P Martin 2015-07-24 1004 case BUG_TRAP_TYPE_BUG:
0f2cb928a1547a Mark Rutland 2022-09-13 1005 die("Oops - BUG", regs, esr);
9fb7410f955f7a Dave P Martin 2015-07-24 1006
9fb7410f955f7a Dave P Martin 2015-07-24 @1007 case BUG_TRAP_TYPE_WARN:
9fb7410f955f7a Dave P Martin 2015-07-24 1008 break;
9fb7410f955f7a Dave P Martin 2015-07-24 1009
9fb7410f955f7a Dave P Martin 2015-07-24 1010 default:
9fb7410f955f7a Dave P Martin 2015-07-24 1011 /* unknown/unrecognised bug trap type */
9fb7410f955f7a Dave P Martin 2015-07-24 1012 return DBG_HOOK_ERROR;
9fb7410f955f7a Dave P Martin 2015-07-24 1013 }
9fb7410f955f7a Dave P Martin 2015-07-24 1014
9fb7410f955f7a Dave P Martin 2015-07-24 1015 /* If thread survives, skip over the BUG instruction and continue: */
6436beeee5721a Julien Thierry 2017-10-25 1016 arm64_skip_faulting_instruction(regs, AARCH64_INSN_SIZE);
9fb7410f955f7a Dave P Martin 2015-07-24 1017 return DBG_HOOK_HANDLED;
9fb7410f955f7a Dave P Martin 2015-07-24 1018 }
9fb7410f955f7a Dave P Martin 2015-07-24 1019
--
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