Commit ccbd2da5 authored by Mark Charlebois's avatar Mark Charlebois Committed by Russell King
Browse files

ARM: 8174/1: 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.

Signed-off-by: default avatarMark Charlebois <charlebm@gmail.com>
Signed-off-by: default avatarBehan Webster <behanw@converseincode.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent f6c9cbf0

arch/arm/include/asm/percpu.h

+2 −2
Original line number Diff line number Diff line
@@ -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;

}

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