[PATCH 06/10] powerpc: Fix bogus crash kernel messages

[Dale Farnsworth]

Commit edd8ce67, Use extended crashkernel command line on ppc64,
resulted in reserve_crashkernel() attempting to reserve a 1 byte
crashkernel area when no no crashkernel reservation is requested.
This results in the following bogus messages:
    Crash kernel location must be 0x2000000
    Reserving 0MB of memory at 32MB for crashkernel

The problem is that when crashk_res.start and crashk_res.end are
both 0, the crash_size is computed to be 1 byte.

Revert back to using the value of crashk_res.start to determine
if crashkernel memory is being reserved, rather than the computed
crash_size.

Signed-off-by: Dale Farnsworth <dale at farnsworth.org>
---
 arch/powerpc/kernel/machine_kexec.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/powerpc/kernel/machine_kexec.c b/arch/powerpc/kernel/machine_kexec.c
index 691dba7..38c1c1a 100644
--- a/arch/powerpc/kernel/machine_kexec.c
+++ b/arch/powerpc/kernel/machine_kexec.c
@@ -84,7 +84,7 @@ void __init reserve_crashkernel(void)
 		crash_size = crashk_res.end - crashk_res.start + 1;
 	}
 
-	if (crash_size == 0)
+	if (crashk_res.start == 0)
 		return;
 
 	/* We might have got these values via the command line or the
-- 
1.5.3.4