diff options
| author | Philipp Rudo <prudo@redhat.com> | 2021-12-24 21:12:39 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-12-25 12:20:55 -0800 |
| commit | 71d2bcec2d4d69ff109c497e6611d6c53c8926d4 (patch) | |
| tree | 974ec36efc4dc51d56f448190c7853b5c8af0f03 | |
| parent | 338635340669d5b317c7e8dcf4fff4a0f3651d87 (diff) | |
kernel/crash_core: suppress unknown crashkernel parameter warning
When booting with crashkernel= on the kernel command line a warning
similar to
Kernel command line: ro console=ttyS0 crashkernel=256M
Unknown kernel command line parameters "crashkernel=256M", will be passed to user space.
is printed.
This comes from crashkernel= being parsed independent from the kernel
parameter handling mechanism. So the code in init/main.c doesn't know
that crashkernel= is a valid kernel parameter and prints this incorrect
warning.
Suppress the warning by adding a dummy early_param handler for
crashkernel=.
Link: https://lkml.kernel.org/r/20211208133443.6867-1-prudo@redhat.com
Fixes: 86d1919a4fb0 ("init: print out unknown kernel parameters")
Signed-off-by: Philipp Rudo <prudo@redhat.com>
Acked-by: Baoquan He <bhe@redhat.com>
Cc: Andrew Halaney <ahalaney@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | kernel/crash_core.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/crash_core.c b/kernel/crash_core.c index eb53f5ec62c9..256cf6db573c 100644 --- a/kernel/crash_core.c +++ b/kernel/crash_core.c @@ -6,6 +6,7 @@ #include <linux/buildid.h> #include <linux/crash_core.h> +#include <linux/init.h> #include <linux/utsname.h> #include <linux/vmalloc.h> @@ -295,6 +296,16 @@ int __init parse_crashkernel_low(char *cmdline, "crashkernel=", suffix_tbl[SUFFIX_LOW]); } +/* + * Add a dummy early_param handler to mark crashkernel= as a known command line + * parameter and suppress incorrect warnings in init/main.c. + */ +static int __init parse_crashkernel_dummy(char *arg) +{ + return 0; +} +early_param("crashkernel", parse_crashkernel_dummy); + Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type, void *data, size_t data_len) { |