tracing/probes: Type casting always involves nested calls

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This allows type casting to various fetchargs without parentheses
by recursively calling parse_probe_arg on the target when type
casting is used.

For example, this allows the following expressions:
 - (STRUCT)%REG->FIELD
 - (STRUCT)$stackN->FIELD
 - (STRUCT)@SYM->FIELD

Note that @SYM+/-OFFSET with typecast needs parentheses like:
  - (STRUCT)(@SYM-8)->FIELD

Link: https://lore.kernel.org/all/178271364804.1176915.17600229399446264813.stgit@devnote2/

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>

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This commit is contained in:

Masami Hiramatsu (Google) 2026-07-02 21:12:41 +09:00

parent 60432df556

commit 52c76ec18e

2 changed files with 75 additions and 52 deletions

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123

kernel/trace/trace_probe.c

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4

kernel/trace/trace_probe.h

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