[POWERPC] Fix hang in start_ldr if _end or _edata is unaligned

Quick fix for lack of memset(__bss_start, 0, _end-__bss_start) in
load_kernel().  If edata is unaligned, the loop will overwrite all
memory because r3 and r4 will never be equal.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/arch/ppc/boot/simple/relocate.S b/arch/ppc/boot/simple/relocate.S
index 0c021556d78e..1bbbcd2f2bcb 100644
--- a/arch/ppc/boot/simple/relocate.S
+++ b/arch/ppc/boot/simple/relocate.S
@@ -154,8 +154,8 @@ do_relocate_out:
 
 start_ldr:
 /* Clear all of BSS and set up stack for C calls */
-        lis     r3,edata@h
-        ori     r3,r3,edata@l
+        lis     r3,__bss_start@h
+        ori     r3,r3,__bss_start@l
         lis     r4,end@h
         ori     r4,r4,end@l
         subi    r3,r3,4
@@ -163,7 +163,7 @@ start_ldr:
         li      r0,0
 50:     stwu    r0,4(r3)
         cmpw    cr0,r3,r4
-        bne     50b
+        blt     50b
 90:     mr      r9,r1           /* Save old stack pointer (in case it matters) */
         lis     r1,.stack@h
         ori     r1,r1,.stack@l