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hc

2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/kernel/trace/trace_seq.c
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@@ -30,9 +30,6 @@
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 /* How much buffer is left on the trace_seq? */
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 #define TRACE_SEQ_BUF_LEFT(s) seq_buf_buffer_left(&(s)->seq)
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-/* How much buffer is written? */
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-#define TRACE_SEQ_BUF_USED(s) seq_buf_used(&(s)->seq)
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-
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 /*
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  * trace_seq should work with being initialized with 0s.
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  */
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@@ -376,3 +373,33 @@
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 	return seq_buf_to_user(&s->seq, ubuf, cnt);
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 }
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 EXPORT_SYMBOL_GPL(trace_seq_to_user);
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+
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+int trace_seq_hex_dump(struct trace_seq *s, const char *prefix_str,
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+		       int prefix_type, int rowsize, int groupsize,
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+		       const void *buf, size_t len, bool ascii)
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+{
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+	unsigned int save_len = s->seq.len;
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+
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+	if (s->full)
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+		return 0;
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+
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+	__trace_seq_init(s);
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+
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+	if (TRACE_SEQ_BUF_LEFT(s) < 1) {
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+		s->full = 1;
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+		return 0;
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+	}
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+
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+	seq_buf_hex_dump(&(s->seq), prefix_str,
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+		   prefix_type, rowsize, groupsize,
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+		   buf, len, ascii);
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+
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+	if (unlikely(seq_buf_has_overflowed(&s->seq))) {
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+		s->seq.len = save_len;
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+		s->full = 1;
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+		return 0;
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+	}
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+
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+	return 1;
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+}
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+EXPORT_SYMBOL(trace_seq_hex_dump);