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From f87f253bac3ce4a4eb2a60a1ae604d74e65f9042 Mon Sep 17 00:00:00 2001
From: Nicholas Piggin <npiggin@gmail.com>
Date: Thu, 24 Nov 2016 00:02:07 +1100
Subject: [PATCH] powerpc/64e: Convert cmpi to cmpwi in head_64.S
From 80f23935cadb ("powerpc: Convert cmp to cmpd in idle enter sequence"):
PowerPC's "cmp" instruction has four operands. Normally people write
"cmpw" or "cmpd" for the second cmp operand 0 or 1. But, frequently
people forget, and write "cmp" with just three operands.
With older binutils this is silently accepted as if this was "cmpw",
while often "cmpd" is wanted. With newer binutils GAS will complain
about this for 64-bit code. For 32-bit code it still silently assumes
"cmpw" is what is meant.
In this case, cmpwi is called for, so this is just a build fix for
new toolchains.
Cc: stable@vger.kernel.org # v3.0+
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---
arch/powerpc/kernel/head_64.S | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index 451a8e1..bdb4612 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -221,9 +221,9 @@ booting_thread_hwid:
*/
_GLOBAL(book3e_start_thread)
LOAD_REG_IMMEDIATE(r5, MSR_KERNEL)
- cmpi 0, r3, 0
+ cmpwi r3, 0
beq 10f
- cmpi 0, r3, 1
+ cmpwi r3, 1
beq 11f
/* If the thread id is invalid, just exit. */
b 13f
@@ -248,9 +248,9 @@ _GLOBAL(book3e_start_thread)
* r3 = the thread physical id
*/
_GLOBAL(book3e_stop_thread)
- cmpi 0, r3, 0
+ cmpwi r3, 0
beq 10f
- cmpi 0, r3, 1
+ cmpwi r3, 1
beq 10f
/* If the thread id is invalid, just exit. */
b 13f
--
2.7.4
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