From: Niklas Schnelle Date: Wed, 5 Jan 2022 15:10:54 +0000 (+0100) Subject: s390/pci: simplify __pciwb_mio() inline asm X-Git-Tag: v6.1-rc5~2333^2~2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7b2932162f66ab33a00a7cdb6d3b2db6dfdbf634;p=platform%2Fkernel%2Flinux-starfive.git 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 --- diff --git a/arch/s390/pci/pci_insn.c b/arch/s390/pci/pci_insn.c index 28d863a..4dd58b1 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)