Commit 7b293216 authored by Niklas Schnelle's avatar Niklas Schnelle Committed by Heiko Carstens
Browse files

s390/pci: simplify __pciwb_mio() inline asm 



The PCI Write Barrier instruction ignores the registers encoded in it.
There is thus no need to explicitly set the register to zero or to
associate it with a variable at all. In the resulting binary this removes
an unnecessary lghi and it makes the code simpler.

Signed-off-by: default avatarNiklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
parent c4538d0f

arch/s390/pci/pci_insn.c

+1 −4
Original line number Diff line number Diff line
@@ -365,10 +365,7 @@ EXPORT_SYMBOL_GPL(zpci_write_block); 


static inline void __pciwb_mio(void)

{

	unsigned long unused = 0;



	asm volatile (".insn    rre,0xb9d50000,%[op],%[op]\n"

		      : [op] "+d" (unused));

	asm volatile (".insn    rre,0xb9d50000,0,0\n");

}



void zpci_barrier(void)