[PATCH v2] alpha: remove unused __SLOW_DOWN_IO and SLOW_DOWN_IO definitions

[Bjorn Helgaas]

Remove unused __SLOW_DOWN_IO and SLOW_DOWN_IO definitions.

Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Cc: Richard Henderson <richard.henderson@xxxxxxxxxx>
Cc: Ivan Kokshaysky <ink@xxxxxxxxxxxxxxxxxxxx>
Cc: Matt Turner <mattst88@xxxxxxxxx>
Cc: linux-alpha@xxxxxxxxxxxxxxx
---
alpha: remove unused SLOW_DOWN_IO

Only alpha and sh define SLOW_DOWN_IO, and there are no uses of it.  Remove
it from alpha.

This was previously posted 4/15/2022 at
  https://lore.kernel.org/all/20220415190817.842864-1-helgaas@xxxxxxxxxx/
and reposted 10/13/2022 at
  https://lore.kernel.org/all/20221014001911.3342485-1-helgaas@xxxxxxxxxx/

Changes from v1 to v2:
  - Drop the ia64 patch because Andrew applied it
      https://lore.kernel.org/all/20221021045245.99636C433C1@xxxxxxxxxxxxxxx/

  - Split sh and alpha to separate series
---
 arch/alpha/include/asm/io.h | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/arch/alpha/include/asm/io.h b/arch/alpha/include/asm/io.h
index 1c3605d874e9..7aeaf7c30a6f 100644
--- a/arch/alpha/include/asm/io.h
+++ b/arch/alpha/include/asm/io.h
@@ -14,10 +14,6 @@
    the implementation we have here matches that interface.  */
 #include <asm-generic/iomap.h>
 
-/* We don't use IO slowdowns on the Alpha, but.. */
-#define __SLOW_DOWN_IO	do { } while (0)
-#define SLOW_DOWN_IO	do { } while (0)
-
 /*
  * Virtual -> physical identity mapping starts at this offset
  */

---
base-commit: f1947d7c8a61db1cb0ef909a6512ede0b1f2115b
change-id: 20221021-wip-bjorn-22-10-slow-down-io-alpha-2b4fac9d06d3

Best regards,
-- 
Bjorn Helgaas <bhelgaas@xxxxxxxxxx>