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seq_buf: Make trace_seq_putmem_hex() support data longer than 8

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commit 6a2cbc58d6 upstream.

Since the raw memory 'data' does not go forward, it will dump repeated
data if the data length is more than 8. If we want to dump longer data
blocks, we need to repeatedly call macro SEQ_PUT_HEX_FIELD. I think it
is a bit redundant, and multiple function calls also affect the performance.

Link: https://lore.kernel.org/lkml/20210625122453.5e2fe304@oasis.local.home/
Link: https://lkml.kernel.org/r/20210626032156.47889-2-yun.zhou@windriver.com

Cc: stable@vger.kernel.org
Fixes: 6d2289f3fa ("tracing: Make trace_seq_putmem_hex() more robust")
Signed-off-by: Yun Zhou <yun.zhou@windriver.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yun Zhou 2021-06-26 11:21:56 +08:00 committed by Greg Kroah-Hartman
parent 47ab2c7413
commit c2e99a8d37
1 changed files with 3 additions and 1 deletions
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4
lib/seq_buf.c
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@ -242,12 +242,14 @@ int seq_buf_putmem_hex(struct seq_buf *s, const void *mem,
break;
/* j increments twice per loop */
len -= j / 2;
hex[j++] = ' ';
seq_buf_putmem(s, hex, j);
if (seq_buf_has_overflowed(s))
return -1;
len -= start_len;
data += start_len;
}
return 0;
}