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authorPhilipp Rudo <prudo@redhat.com>2021-12-24 21:12:39 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2021-12-25 12:20:55 -0800
commit71d2bcec2d4d69ff109c497e6611d6c53c8926d4 (patch)
tree974ec36efc4dc51d56f448190c7853b5c8af0f03
parent338635340669d5b317c7e8dcf4fff4a0f3651d87 (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.c11
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)
{