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Commit 34ccf8f4 authored by Mark Charlebois's avatar Mark Charlebois Committed by Will Deacon
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arm64: LLVMLinux: Use global stack register variable for aarch64 



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: default avatarMark Charlebois <charlebm@gmail.com>
Signed-off-by: default avatarBehan Webster <behanw@converseincode.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 2128df14

arch/arm64/include/asm/percpu.h

+2 −2
Original line number Diff line number Diff line
@@ -26,13 +26,13 @@ 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");



	/*

	 * We want to allow caching the value, so avoid using volatile and

	 * 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;

}