alpha: drop pre-EV56 support

All EV4 machines are already gone, and the remaining EV5 based machines
all support the slightly more modern EV56 generation as well.
Debian only supports EV56 and later.

Drop both of these and build kernels optimized for EV56 and higher
when the "generic" options is selected, tuning for an out-of-order
EV6 pipeline, same as Debian userspace.

Since this was the only supported architecture without 8-bit and
16-bit stores, common kernel code no longer has to worry about
aligning struct members, and existing workarounds from the block
and tty layers can be removed.

The alpha memory management code no longer needs an abstraction
for the differences between EV4 and EV5+.

Link: https://lists.debian.org/debian-alpha/2023/05/msg00009.html
Acked-by: Paul E. McKenney <paulmck@kernel.org>
Acked-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

2 files changed, 4 insertions, 16 deletions

diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index cb1526ec44b5..c3e098b21c16 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -88,15 +88,9 @@ struct block_device {
 
 /*
  * Block error status values.  See block/blk-core:blk_errors for the details.
- * Alpha cannot write a byte atomically, so we need to use 32-bit value.
  */
-#if defined(CONFIG_ALPHA) && !defined(__alpha_bwx__)
-typedef u32 __bitwise blk_status_t;
-typedef u32 blk_short_t;
-#else
 typedef u8 __bitwise blk_status_t;
 typedef u16 blk_short_t;
-#endif
 #define	BLK_STS_OK 0
 #define BLK_STS_NOTSUPP		((__force blk_status_t)1)
 #define BLK_STS_TIMEOUT		((__force blk_status_t)2)
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 2b2e6f0a54d6..2372f9357240 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -145,15 +145,12 @@ struct tty_operations;
  * @count: count of open processes, reaching zero cancels all the work for
  *	   this tty and drops a @kref too (but does not free this tty)
  * @winsize: size of the terminal "window" (cf. @winsize_mutex)
- * @flow: flow settings grouped together, see also @flow.unused
+ * @flow: flow settings grouped together
  * @flow.lock: lock for @flow members
  * @flow.stopped: tty stopped/started by stop_tty()/start_tty()
  * @flow.tco_stopped: tty stopped/started by %TCOOFF/%TCOON ioctls (it has
  *		      precedence over @flow.stopped)
- * @flow.unused: alignment for Alpha, so that no members other than @flow.* are
- *		 modified by the same 64b word store. The @flow's __aligned is
- *		 there for the very same reason.
- * @ctrl: control settings grouped together, see also @ctrl.unused
+ * @ctrl: control settings grouped together
  * @ctrl.lock: lock for @ctrl members
  * @ctrl.pgrp: process group of this tty (setpgrp(2))
  * @ctrl.session: session of this tty (setsid(2)). Writes are protected by both
@@ -161,7 +158,6 @@ struct tty_operations;
  *		  them.
  * @ctrl.pktstatus: packet mode status (bitwise OR of %TIOCPKT_ constants)
  * @ctrl.packet: packet mode enabled
- * @ctrl.unused: alignment for Alpha, see @flow.unused for explanation
  * @hw_stopped: not controlled by the tty layer, under @driver's control for CTS
  *		handling
  * @receive_room: bytes permitted to feed to @ldisc without any being lost
@@ -216,8 +212,7 @@ struct tty_struct {
 		spinlock_t lock;
 		bool stopped;
 		bool tco_stopped;
-		unsigned long unused[0];
-	} __aligned(sizeof(unsigned long)) flow;
+	} flow;
 
 	struct {
 		struct pid *pgrp;
@@ -225,8 +220,7 @@ struct tty_struct {
 		spinlock_t lock;
 		unsigned char pktstatus;
 		bool packet;
-		unsigned long unused[0];
-	} __aligned(sizeof(unsigned long)) ctrl;
+	} ctrl;
 
 	bool hw_stopped;
 	bool closing;