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Doc: add doc to state that the --log option is deprecated 

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 state the
"--log" option is deprecated.

Signed-off-by: Tao Liu <ltao@redhat.com>
This commit is contained in:
Tao Liu 2024-11-05 15:59:32 +13:00 committed by Lianbo Jiang
parent 968debd0d5
commit ca74157283
2 changed files with 4 additions and 0 deletions
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2
crash.8
View File

@ -337,6 +337,8 @@ devices.
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).
.TP
.B --no_kallsyms
Do not use kallsyms-generated symbol information contained within

2
help.c
View File

@ -215,6 +215,8 @@ char *program_usage_info[] = {
" 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).",
"",
" --no_kallsyms",
" Do not use kallsyms-generated symbol information contained within",