Commit e388d66f authored by Heiko Carstens's avatar Heiko Carstens
Browse files

s390/cmpxchg: remove digits from input constraints 

Instead of using a digit for input constraints simply initialize the
corresponding output operand in C code and use a "+" constraint
modifier.

Link: https://lore.kernel.org/r/Y2J8H82B6JhJhrp2@osiris


Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
parent ce968f65

arch/s390/include/asm/cmpxchg.h

+6 −8
Original line number Diff line number Diff line
@@ -142,26 +142,24 @@ static __always_inline unsigned long __cmpxchg(unsigned long address, 
		return prev >> shift;

	}

	case 4: {

		unsigned int prev;

		unsigned int prev = old;



		asm volatile(

			"	cs	%[prev],%[new],%[address]\n"

			: [prev] "=&d" (prev),

			: [prev] "+&d" (prev),

			  [address] "+Q" (*(int *)address)

			: "0" ((unsigned int)old),

			  [new] "d" (new)

			: [new] "d" (new)

			: "memory", "cc");

		return prev;

	}

	case 8: {

		unsigned long prev;

		unsigned long prev = old;



		asm volatile(

			"	csg	%[prev],%[new],%[address]\n"

			: [prev] "=&d" (prev),

			: [prev] "+&d" (prev),

			  [address] "+QS" (*(long *)address)

			: "0" (old),

			  [new] "d" (new)

			: [new] "d" (new)

			: "memory", "cc");

		return prev;

	}