From 7b2932162f66ab33a00a7cdb6d3b2db6dfdbf634 Mon Sep 17 00:00:00 2001 From: Niklas Schnelle Date: Wed, 5 Jan 2022 16:10:54 +0100 Subject: 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: Niklas Schnelle Signed-off-by: Heiko Carstens --- arch/s390/pci/pci_insn.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) (limited to 'arch/s390') diff --git a/arch/s390/pci/pci_insn.c b/arch/s390/pci/pci_insn.c index 28d863aaafea..4dd58b196cea 100644 --- a/arch/s390/pci/pci_insn.c +++ b/arch/s390/pci/pci_insn.c @@ -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) -- cgit