tracing: Return ERR_PTR() from expr_str()

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expr_str() currently reports all failure cases as NULL, so callers cannot
distinguish invalid recursion depth from allocation failure or later
string construction errors.

Return ERR_PTR()-encoded errors from expr_str() and make parse_unary()
and parse_expr() propagate them. Clear expr->name before destroying the
hist field so the error pointer is not freed as a string.

Link: https://patch.msgid.link/20260611055945.22348-3-pengpeng@iscas.ac.cn
Signed-off-by: Pengpeng Hou <pengpeng@iscas.ac.cn>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

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Pengpeng Hou 2026-06-11 13:59:44 +08:00 • committed by Steven Rostedt

parent 988995c055

commit a5ca27e8ff

1 changed files with 20 additions and 5 deletions

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kernel/trace/trace_events_hist.c

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