[PATCH] Skip the "copy down" of the kernel if it is already at zero.

[PATCH] Skip the "copy down" of the kernel if it is already at zero.

[Jimi Xenidis]

This patch allows the kernel to recognized that it was loaded at zero
and the copy down of the image is unnecessary.  This is useful for
Simulators and kexec models.
On a typical 3.8 MiB vmlinux.strip this saves about 2.3 million instructions.

---

 arch/powerpc/kernel/head_64.S |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

88f9d7e234b31d5b06decf266414ba2e920ede3e
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index b7d1404..cd57a6b 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -1654,6 +1654,9 @@ _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
 
-- 
1.3.3