Signed-off-by: Shogo Matsumoto <shogo.matsumoto(a)fujitsu.com&gt; --- help.c | 25 ++++++++++++++++++++++++- 1 file changed, 24 insertions(+), 1 deletion(-) diff --git a/help.c b/help.c index 04a7eff..d8d2eab 100644 --- a/help.c +++ b/help.c @@ -3886,7 +3886,7 @@ NULL char *help_log[] = { "log", "dump system message buffer", -"[-Ttdma]", +"[-Ttdmas]", " This command dumps the kernel log_buf contents in chronological order. The", " command supports the older log_buf formats, which may or may not contain a", " timestamp inserted prior to each message, as well as the newer variable-length", @@ -3907,6 +3907,8 @@ char *help_log[] = { " shown with 'set debug 1'.", " -a Dump the audit logs remaining in kernel audit buffers that have not", " been copied out to the user-space audit daemon.", +" -s Dump the printk logs remaining in kernel safe per-CPU buffers that", +" have not been flushed out to log_buf.", " ", "\nEXAMPLES", " Dump the kernel message buffer:\n", @@ -4054,6 +4056,27 @@ char *help_log[] = { " [Sat Apr 4 07:41:09 2020] MTRR default type: uncachable", " [Sat Apr 4 07:41:09 2020] MTRR variable ranges disabled:", " ...", +" ", +" On a system which has printk_safe_seq_buf buffer,", +" display its unflushed log with buffer name:\n", +" %s> log", +" [nmi_print_seq] Uhhuh. NMI received for unknown reason 30 on CPU 0.", +" [nmi_print_seq] Do you have a strange power saving mode enabled?", +" [nmi_print_seq] Dazed and confused, but trying to continue", +" ...", +" ", +" Dump the printk safe buffers:\n", +" %s> log -s", +" PRINTK_SAFE_SEQ_BUF: nmi_print_seq", +" CPU: 0 ADDR: ffff8ca4fbc19ce0 LEN: 150 MESSAGE_LOST: 0", +" Uhhuh. NMI received for unknown reason 20 on CPU 0.", +" Do you have a strange power saving mode enabled?", +" Dazed and confused, but trying to continue", +" ...", +" PRINTK_SAFE_SEQ_BUF: safe_print_seq", +" CPU: 0 ADDR: ffff8ca4fbc1ad00 LEN: 0 MESSAGE_LOST: 0", +" (empty)", +" ...", NULL }; -- 2.29.2