Check for crashkernel memory reservation

Check whether memory for crashkernel is reserved by calling arch dependent
functions. The patch also creates dummy functions in ppc, ia64 and s390
architectures, so that the build process will not break. The function
"is_crashkernel_mem_reserved" needs to be implemented on ppc, ia64 and
s390 architectures.

Signed-off-by: Mohan Kumar M <mohan@in.ibm.com>
Signed-off-by: Simon Horman <horms@verge.net.au>

1 files changed, 7 insertions, 0 deletions

diff --git a/kexec/kexec.c b/kexec/kexec.c
index ce0663e..204a4b8 100644
--- a/kexec/kexec.c
+++ b/kexec/kexec.c
@@ -848,6 +848,13 @@ int main(int argc, char *argv[])
 		}
 	}
 
+	if ((kexec_flags & KEXEC_ON_CRASH) && !is_crashkernel_mem_reserved()) {
+		printf("Memory for crashkernel is not reserved\n");
+		printf("Please reserve memory by passing ");
+		printf("\"crashkernel=X@Y\" parameter to the kernel\n");
+		die("Then try loading kdump kernel\n");
+	}
+
 	fileind = optind;
 	/* Reset getopt for the next pass; called in other source modules */
 	opterr = 1;