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tracing: Replace strncpy with memcpy for fixed-length substring copy
checkpatch.pl reports the following warning: WARNING: Prefer strscpy, strscpy_pad, or __nonstring over strncpy (see: https://github.com/KSPP/linux/issues/90) In synth_field_string_size(), replace strncpy() with memcpy() to copy 'len' characters from 'start' to 'buf'. The code manually adds a NUL terminator after the copy, making memcpy safe here. Link: https://lore.kernel.org/20250325181232.38284-1-siddarthsgml@gmail.com Signed-off-by: Siddarth G <siddarthsgml@gmail.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
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