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arm64: LLVMLinux: Use global stack register variable for aarch64

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To support both Clang and GCC, use the global stack register variable vs
a local register variable.

Author: Mark Charlebois <charlebm@gmail.com>
Signed-off-by: Mark Charlebois <charlebm@gmail.com>
Signed-off-by: Behan Webster <behanw@converseincode.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Mark Charlebois
2014-08-27 05:29:33 +01:00
committed by Will Deacon
parent 2128df143d
commit 34ccf8f455
1 changed files with 2 additions and 2 deletions
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4
arch/arm64/include/asm/percpu.h
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@@ -26,13 +26,13 @@ static inline void set_my_cpu_offset(unsigned long off)
static inline unsigned long __my_cpu_offset(void) static inline unsigned long __my_cpu_offset(void)
{ {
unsigned long off; unsigned long off;
register unsigned long *sp asm ("sp");
/* /*
* We want to allow caching the value, so avoid using volatile and * We want to allow caching the value, so avoid using volatile and
* instead use a fake stack read to hazard against barrier(). * instead use a fake stack read to hazard against barrier().
*/ */
asm("mrs %0, tpidr_el1" : "=r" (off) : "Q" (*sp)); asm("mrs %0, tpidr_el1" : "=r" (off) :
"Q" (*(const unsigned long *)current_stack_pointer));
return off; return off;
} }