From: chenqiwu <chenq...@xiaomi.com>
Fix for the "log -a" option. The printk logbuf is a ring buffer,
if log_first_idx is larger than log_next_idx, there are two buffer
zones must be handled for logdump:
1) [log_first_idx, log_buf_len]
2) [0, log_next_idx]
However, the original code ignores the logdump for the second buffer
zone if log_first_idx is larger than log_next_idx. Without this patch,
the option fails with the following error message "duplicate log_buf
message pointer".
Signed-off-by: chenqiwu <chenq...@xiaomi.com>
---
kernel.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/kernel.c b/kernel.c
index 68ee282..7604fac 100644
--- a/kernel.c
+++ b/kernel.c
@@ -5278,8 +5278,12 @@ dump_variable_length_record_log(int msg_flags)
idx = log_next(idx, logbuf);
if (idx >= log_buf_len) {
- error(INFO, "\ninvalid log_buf entry encountered\n");
- break;
+ if (log_first_idx > log_next_idx)
+ idx = 0;
+ else {
+ error(INFO, "\ninvalid log_buf entry
encountered\n");
+ break;
+ }
}
if (CRASHDEBUG(1) && (idx == log_next_idx))
--
1.9.1
--
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