lkml.org 
[lkml]   [2011]   [Feb]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 2/4] msm: scm: Fix improper register assignment
Date
Assign the registers used in the inline assembly immediately
before the inline assembly block. This ensures the compiler
doesn't optimize away dead register assignments when it
shouldn't.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
---
arch/arm/mach-msm/scm.c | 7 +++++--
1 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-msm/scm.c b/arch/arm/mach-msm/scm.c
index ba57b5a..5eddf54 100644
--- a/arch/arm/mach-msm/scm.c
+++ b/arch/arm/mach-msm/scm.c
@@ -264,13 +264,16 @@ u32 scm_get_version(void)
{
int context_id;
static u32 version = -1;
- register u32 r0 asm("r0") = 0x1 << 8;
- register u32 r1 asm("r1") = (u32)&context_id;
+ register u32 r0 asm("r0");
+ register u32 r1 asm("r1");

if (version != -1)
return version;

mutex_lock(&scm_lock);
+
+ r0 = 0x1 << 8;
+ r1 = (u32)&context_id;
asm volatile(
__asmeq("%0", "r1")
__asmeq("%1", "r0")
--
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.


\
 
 \ /
  Last update: 2011-02-24 19:47    [W:0.211 / U:0.040 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site