With the SGI SN2 machvec removal most of the indirections are unused
now, so remove them. This includes the entire removal of the mmio
read*/write* macros as the generic ones are identical to the
asm-generic/io.h version.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lkml.kernel.org/r/20190813072514.23299-17-hch@lst.de
Signed-off-by: Tony Luck <tony.luck@intel.com>
The mmiowb() macro is horribly difficult to use and drivers will continue
to work most of the time if they omit a call when it is required.
Rather than rely on driver authors getting this right, push mmiowb() into
arch_spin_unlock() for ia64. If this is deemed to be a performance issue,
a subsequent optimisation could make use of ARCH_HAS_MMIOWB to elide
the barrier in cases where no I/O writes were performed inside the
critical section.
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Christoph Hellwig