kexec: add further check to crashkernel

When using crashkernel=2M-256M, the kernel doesn't give any warning.  This
is misleading sometimes.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/kexec.c b/kernel/kexec.c
index 769e347c51967ee889e82ab1073da1e847aa30b2..3288c9b29bae85193726b18a665bace620b26177 100644 (file)
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -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;
 }