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-rw-r--r--arch/powerpc/kernel/head_64.S3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index da092429349..f2fab687a01 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -1664,6 +1664,9 @@ _STATIC(__after_prom_start)
/* i.e. where we are running */
/* the source addr */
+ cmpdi r4,0 /* In some cases the loader may */
+ beq .start_here_multiplatform /* have already put us at zero */
+ /* so we can skip the copy. */
LOAD_REG_IMMEDIATE(r5,copy_to_here) /* # bytes of memory to copy */
sub r5,r5,r27