0c9501b8 by Mark Charlebois Committed by Behan Webster

arm: LLVMLinux: Use global stack register variable for percpu

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.

KernelVersion: 3.17.0-rc6
Signed-off-by: Mark Charlebois <charlebm@gmail.com>
Signed-off-by: Behan Webster <behanw@converseincode.com>
1 parent f7ec0d31
......@@ -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;
}
......