kernel/crash_core: suppress unknown crashkernel parameter warning
Subsystems (3)
PATCH v2 1/1 kernel/crash_core: suppress unknown crashkernel parameter warning
When booting with crashkernel= on the kernel command line a warning similar to
[ 0.038294] Kernel command line: ro console=ttyS0 crashkernel=256M [ 0.038353] 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=.
Fixes 86d1919a4fb0 ("init: print out unknown kernel parameters")
Signed-off-by Philipp Rudo <[email protected]>
Acked-by Baoquan He <[email protected]>
---
v2:
- improve commit message
- add Acked-by from Baoquan
--- kernel/crash_core.c | 11 +++++++++++ 1 file changed, 11 insertions(+)
kernel/crash_core.c +11 -0
@@ -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) {
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