The patch titled
Subject: kernel/crash_core: suppress unknown crashkernel parameter warning
has been added to the -mm tree. Its filename is
kernel-crash_core-suppress-unknown-crashkernel-parameter-warning.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/kernel-crash_core-suppress-unknown-crashkernel-parameter-warning.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/kernel-crash_core-suppress-unknown-crashkernel-parameter-warning.patch
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------------------------------------------------------
From: Philipp Rudo <prudo@xxxxxxxxxx>
Subject: 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=.
Link: https://lkml.kernel.org/r/20211208133443.6867-1-prudo@xxxxxxxxxx
Fixes: 86d1919a4fb0 ("init: print out unknown kernel parameters")
Signed-off-by: Philipp Rudo <prudo@xxxxxxxxxx>
Acked-by: Baoquan He <bhe@xxxxxxxxxx>
Cc: Andrew Halaney <ahalaney@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/crash_core.c | 11 +++++++++++
1 file changed, 11 insertions(+)
--- a/kernel/crash_core.c~kernel-crash_core-suppress-unknown-crashkernel-parameter-warning
+++ a/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 *c
"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)
{
_
Patches currently in -mm which might be from prudo@xxxxxxxxxx are
kernel-crash_core-suppress-unknown-crashkernel-parameter-warning.patch
