tracing/probes: Extend max length of argument string

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To support BTF argument parsing (such as accessing fields within nested
structures via typecasting), the maximum argument string length needs
to be extended. Extend MAX_ARGSTR_LEN from 63 to 255.

Since MAX_ARGSTR_LEN was previously reused to format command heads in
trace_*probe_match_command_head() functions, introduce a dedicated
MAX_COMMON_HEAD_LEN (63) macro for matching command heads and switch
these functions to use the new macro.

Link: https://lore.kernel.org/all/178399140457.27810.11387684872148824707.stgit@devnote2/

Assisted-by: Antigravity:gemini-3.5-flash
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>

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This commit is contained in:

Masami Hiramatsu 2026-07-14 10:10:04 +09:00 • committed by Masami Hiramatsu (Google)

parent 0b420da72e

commit 47e4ec6871

7 changed files with 8 additions and 7 deletions

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kernel/trace/trace_fprobe.c

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kernel/trace/trace_kprobe.c

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kernel/trace/trace_probe.h

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kernel/trace/trace_uprobe.c

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tools/testing/selftests/ftrace/test.d/dynevent/fprobe_syntax_errors.tc

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tools/testing/selftests/ftrace/test.d/dynevent/tprobe_syntax_errors.tc

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tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc

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