diff options
| -rw-r--r-- | kernel/printk/printk.c | 19 |
1 files changed, 9 insertions, 10 deletions
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index d5fd844e5b08..bfbf284e4218 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -367,16 +367,20 @@ static int logbuf_has_space(u32 msg_size, bool empty) static int log_make_free_space(u32 msg_size) { - while (log_first_seq < log_next_seq) { - if (logbuf_has_space(msg_size, false)) - return 0; + while (log_first_seq < log_next_seq && + !logbuf_has_space(msg_size, false)) { /* drop old messages until we have enough contiguous space */ log_first_idx = log_next(log_first_idx); log_first_seq++; } + if (clear_seq < log_first_seq) { + clear_seq = log_first_seq; + clear_idx = log_first_idx; + } + /* sequence numbers are equal, so the log buffer is empty */ - if (logbuf_has_space(msg_size, true)) + if (logbuf_has_space(msg_size, log_first_seq == log_next_seq)) return 0; return -ENOMEM; @@ -854,6 +858,7 @@ void log_buf_kexec_setup(void) VMCOREINFO_SYMBOL(log_buf); VMCOREINFO_SYMBOL(log_buf_len); VMCOREINFO_SYMBOL(log_first_idx); + VMCOREINFO_SYMBOL(clear_idx); VMCOREINFO_SYMBOL(log_next_idx); /* * Export struct printk_log size and field offsets. User space tools can @@ -1216,12 +1221,6 @@ static int syslog_print_all(char __user *buf, int size, bool clear) u32 idx; enum log_flags prev; - if (clear_seq < log_first_seq) { - /* messages are gone, move to first available one */ - clear_seq = log_first_seq; - clear_idx = log_first_idx; - } - /* * Find first record that fits, including all following records, * into the user-provided buffer for this dump. |