Since kernel(>=v5.10), a new lockless ringbuffer is introduced. And
crash commit a5531b24 ("printk: add support for lockless ringbuffer")
implemented the lockless ringbuffer dumping for cmd_log, this however,
relies on the existence of kernel debuginfo.
Since there is already a similar function been implemented for
makedumpfile, aka "makedumpfile --dump-dmesg" to dump dmesg logs with
only vmcore, there is no need to maintain a similar code in crash
as well. In addition, this option is not widely used, so just mark
"--log" option as deprecated for crash.
Signed-off-by: Tao Liu <ltao@xxxxxxxxxx>
---
crash.8 | 4 +++-
help.c | 4 +++-
2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/crash.8 b/crash.8
index 0662f92..6abd381 100644
--- a/crash.8
+++ b/crash.8
@@ -333,10 +333,12 @@ or
.I /proc/kcore
devices.
.TP
-.BI --log \ dumpfile
+.BI --log \ dumpfile \ (deprecated)
Dump the contents of the kernel log buffer. A kernel namelist
argument is not necessary, but the dumpfile must contain the
VMCOREINFO data taken from the original /proc/vmcore ELF header.
+Note: this option is deprecated and will no longer work for
+kernel(>=v5.10), use "makedumpfile --dump-dmesg" instead.
.TP
.B --no_kallsyms
Do not use kallsyms-generated symbol information contained within
diff --git a/help.c b/help.c
index e95ac1d..caf52f5 100644
--- a/help.c
+++ b/help.c
@@ -211,10 +211,12 @@ char *program_usage_info[] = {
" Use device as an alternative device to the /dev/crash, /dev/mem",
" or /proc/kcore devices.",
"",
- " --log dumpfile",
+ " --log dumpfile (deprecated)",
" Dump the contents of the kernel log buffer. A kernel namelist",
" argument is not necessary, but the dumpfile must contain the",
" VMCOREINFO data taken from the original /proc/vmcore ELF header.",
+ " Note: this option is deprecated and will no longer work for",
+ " kernel(>=v5.10), use \"makedumpfile --dump-dmesg\" instead.",
"",
" --no_kallsyms",
" Do not use kallsyms-generated symbol information contained within",
--
2.47.0
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