kexec: add further check to crashkernel

From: Zhenzhong Duan <[email protected]>

When add crashkernel=2M-256M, kernel don't give any warning. This is misleading sometimes.

---
kernel/kexec.c | 4 ++++

1 files changed, 4 insertions(+), 0 deletions(-)

index 7b08867..0a6d147 100644
@@ -1359,6 +1359,10 @@ static int __init parse_crashkernel_simple(char 		*cmdline,
 

	if (*cur == '@')
		*crash_base = memparse(cur+1, &cur);

+ else if (*cur != ' ' && *cur != '\0') {
+ pr_warning("crashkernel: unrecognized char\n");
+ return -EINVAL;
+ }

	return 0;
}

-- 1.7.3

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That seems reasonable.

Andrew do you want to carry this one. I don't have a good tree to stash this in.