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kernel/crash_core: suppress unknown crashkernel parameter warning
[ Upstream commit71d2bcec2d
] 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:86d1919a4f
("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> Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -6,6 +6,7 @@
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#include <linux/buildid.h>
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#include <linux/crash_core.h>
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#include <linux/init.h>
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#include <linux/utsname.h>
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#include <linux/vmalloc.h>
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@ -295,6 +296,16 @@ int __init parse_crashkernel_low(char *cmdline,
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"crashkernel=", suffix_tbl[SUFFIX_LOW]);
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}
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/*
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* Add a dummy early_param handler to mark crashkernel= as a known command line
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* parameter and suppress incorrect warnings in init/main.c.
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*/
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static int __init parse_crashkernel_dummy(char *arg)
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{
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return 0;
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}
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early_param("crashkernel", parse_crashkernel_dummy);
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Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type,
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void *data, size_t data_len)
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{
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