diff options
| author | Niklas Schnelle <schnelle@linux.ibm.com> | 2022-01-05 16:10:54 +0100 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2022-01-07 11:48:17 +0100 |
| commit | 7b2932162f66ab33a00a7cdb6d3b2db6dfdbf634 (patch) | |
| tree | 59b12e6f751bb650c5e05559f7eabe61a9dbaa69 /arch/s390 | |
| parent | c4538d0f19010f22854360d99551eb293228b946 (diff) | |
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 <schnelle@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/pci/pci_insn.c | 5 |
1 files changed, 1 insertions, 4 deletions
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) |