powerpc: Fix div64 in bootloader

The code is missing a fix that went into the main kernel variant
(we should try to share that code again at some stage)

Reported-by: Albert Cahalan <acahalan@gmail.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/boot/div64.S b/arch/powerpc/boot/div64.S
index 722f360..d271ab5 100644 (file)
--- a/arch/powerpc/boot/div64.S
+++ b/arch/powerpc/boot/div64.S
@@ -33,9 +33,10 @@ __div64_32:
        cntlzw  r0,r5           # we are shifting the dividend right
        li      r10,-1          # to make it < 2^32, and shifting
        srw     r10,r10,r0      # the divisor right the same amount,
-       add     r9,r4,r10       # rounding up (so the estimate cannot
+       addc    r9,r4,r10       # rounding up (so the estimate cannot
        andc    r11,r6,r10      # ever be too large, only too small)
        andc    r9,r9,r10
+       addze   r9,r9
        or      r11,r5,r11
        rotlw   r9,r9,r0
        rotlw   r11,r11,r0