[PATCH v2 7/7] arm: LLVMLinux: Use global stack register variable for percpu

2014-09-05 Thread behanw 
From: Mark Charlebois 

Using global current_stack_pointer works on both clang and gcc.
current_stack_pointer is an unsigned long and needs to be cast
as a pointer to dereference.

Signed-off-by: Mark Charlebois 
---
 arch/arm/include/asm/percpu.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm/include/asm/percpu.h b/arch/arm/include/asm/percpu.h
index 209e650..a89b407 100644
--- a/arch/arm/include/asm/percpu.h
+++ b/arch/arm/include/asm/percpu.h
@@ -30,14 +30,14 @@ static inline void set_my_cpu_offset(unsigned long off)
 static inline unsigned long __my_cpu_offset(void)
 {
unsigned long off;
-   register unsigned long *sp asm ("sp");
 
/*
 * Read TPIDRPRW.
 * We want to allow caching the value, so avoid using volatile and
 * instead use a fake stack read to hazard against barrier().
 */
-   asm("mrc p15, 0, %0, c13, c0, 4" : "=r" (off) : "Q" (*sp));
+   asm("mrc p15, 0, %0, c13, c0, 4" : "=r" (off)
+   : "Q" (*(const unsigned long *)current_stack_pointer));
 
return off;
 }
-- 
1.9.1

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[PATCH v2 7/7] arm: LLVMLinux: Use global stack register variable for percpu

2014-09-05 Thread behanw 
From: Mark Charlebois charl...@gmail.com

Using global current_stack_pointer works on both clang and gcc.
current_stack_pointer is an unsigned long and needs to be cast
as a pointer to dereference.

Signed-off-by: Mark Charlebois charl...@gmail.com
---
 arch/arm/include/asm/percpu.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm/include/asm/percpu.h b/arch/arm/include/asm/percpu.h
index 209e650..a89b407 100644
--- a/arch/arm/include/asm/percpu.h
+++ b/arch/arm/include/asm/percpu.h
@@ -30,14 +30,14 @@ static inline void set_my_cpu_offset(unsigned long off)
 static inline unsigned long __my_cpu_offset(void)
 {
unsigned long off;
-   register unsigned long *sp asm (sp);
 
/*
 * Read TPIDRPRW.
 * We want to allow caching the value, so avoid using volatile and
 * instead use a fake stack read to hazard against barrier().
 */
-   asm(mrc p15, 0, %0, c13, c0, 4 : =r (off) : Q (*sp));
+   asm(mrc p15, 0, %0, c13, c0, 4 : =r (off)
+   : Q (*(const unsigned long *)current_stack_pointer));
 
return off;
 }
-- 
1.9.1

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