From: Yun Zhou Date: Sat, 26 Jun 2021 03:21:56 +0000 (+0800) Subject: seq_buf: Make trace_seq_putmem_hex() support data longer than 8 X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=6a2cbc58d6c9d90cd74288cc497c2b45815bc064;p=linux.git seq_buf: Make trace_seq_putmem_hex() support data longer than 8 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: 6d2289f3faa7 ("tracing: Make trace_seq_putmem_hex() more robust") Signed-off-by: Yun Zhou Signed-off-by: Steven Rostedt (VMware) --- diff --git a/lib/seq_buf.c b/lib/seq_buf.c index 62c20596ef42b..6dafde8513337 100644 --- a/lib/seq_buf.c +++ b/lib/seq_buf.c @@ -245,12 +245,14 @@ 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; }