Re: [PATCH v2] tracing: Use seq_buf for string concatenation

Hi Woradorn,

kernel test robot noticed the following build warnings:

[auto build test WARNING on v7.2-rc7]
[also build test WARNING on linus/master]
[cannot apply to linux-review/Woradorn-Laodhanadhaworn/tracing-Use-seq_buf-for-string-concatenation/20260813-224524 trace/for-next next-20260814]
[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/Woradorn-Laodhanadhaworn/tracing-Use-seq_buf-for-string-concatenation/20260815-195403
base:   v7.2-rc7
patch link:    https://lore.kernel.org/r/20260622094623.18469-1-woradorn.laon%40gmail.com
patch subject: [PATCH v2] tracing: Use seq_buf for string concatenation
config: hexagon-randconfig-r123-20260816 (https://download.01.org/0day-ci/archive/20260817/[email protected]/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260817/[email protected]/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 <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

All warnings (new ones prefixed by >>, old ones prefixed by <<):

>> WARNING: modpost: vmlinux: section mismatch in reference: seq_buf_str+0x4 (section: .text) -> bootup_event_buf (section: .init.data)
WARNING: modpost: vmlinux: section mismatch in reference: seq_buf_str+0x8 (section: .text) -> bootup_event_buf (section: .init.data)
>> WARNING: modpost: vmlinux: section mismatch in reference: seq_buf_str+0xe0 (section: .text) -> __TRACE_SYSTEM_ERROR_DETECTOR_KFENCE (section: .init.data)
WARNING: modpost: vmlinux: section mismatch in reference: seq_buf_str+0xe4 (section: .text) -> __TRACE_SYSTEM_ERROR_DETECTOR_KFENCE (section: .init.data)
WARNING: modpost: vmlinux: section mismatch in reference: seq_buf_str+0xfc (section: .text) -> bootup_event_buf (section: .init.data)
WARNING: modpost: vmlinux: section mismatch in reference: seq_buf_str+0x100 (section: .text) -> bootup_event_buf (section: .init.data)
WARNING: modpost: vmlinux: section mismatch in reference: seq_buf_str+0x1cc (section: .text) -> bootup_event_buf (section: .init.data)
WARNING: modpost: vmlinux: section mismatch in reference: seq_buf_str+0x1d0 (section: .text) -> bootup_event_buf (section: .init.data)
WARNING: modpost: vmlinux: section mismatch in reference: seq_buf_str+0x1f4 (section: .text) -> bootup_event_buf (section: .init.data)
WARNING: modpost: vmlinux: section mismatch in reference: seq_buf_str+0x1f8 (section: .text) -> bootup_event_buf (section: .init.data)
WARNING: modpost: vmlinux: section mismatch in reference: seq_buf_str+0x228 (section: .text) -> bootup_event_buf (section: .init.data)
WARNING: modpost: vmlinux: section mismatch in reference: seq_buf_str+0x22c (section: .text) -> bootup_event_buf (section: .init.data)

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