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 originates from crashkernel= being parsed independent from
the early_param() 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 <prudo@xxxxxxxxxx>
---
kernel/crash_core.c | 11 +++++++++++
1 file changed, 11 insertions(+)
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)
{
--
2.31.1
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