arch: remove tile port

The Tile architecture port was added by Chris Metcalf in 2010, and
maintained until early 2018 when he orphaned it due to his departure
from Mellanox, and nobody else stepped up to maintain it. The product
line is still around in the form of the BlueField SoC, but no longer
uses the Tile architecture.

There are also still products for sale with Tile-GX SoCs, notably the
Mikrotik CCR router family. The products all use old (linux-3.3) kernels
with lots of patches and won't be upgraded by their manufacturers. There
have been efforts to port both OpenWRT and Debian to these, but both
projects have stalled and are very unlikely to be continued in the future.

Given that we are reasonably sure that nobody is still using the port
with an upstream kernel any more, it seems better to remove it now while
the port is in a good shape than to let it bitrot for a few years first.

Cc: Chris Metcalf <chris.d.metcalf@gmail.com>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Link: http://www.mellanox.com/page/npu_multicore_overview
Link: https://jenkins.debian.net/view/rebootstrap/job/rebootstrap_tilegx_gcc7/
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 0 insertions, 73 deletions

diff --git a/arch/tile/include/asm/stack.h b/arch/tile/include/asm/stack.h
deleted file mode 100644
index 3573325e340b..000000000000
--- a/arch/tile/include/asm/stack.h
+++ /dev/null
@@ -1,73 +0,0 @@
-/*
- * Copyright 2010 Tilera Corporation. All Rights Reserved.
- *
- *   This program is free software; you can redistribute it and/or
- *   modify it under the terms of the GNU General Public License
- *   as published by the Free Software Foundation, version 2.
- *
- *   This program is distributed in the hope that it will be useful, but
- *   WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
- *   NON INFRINGEMENT.  See the GNU General Public License for
- *   more details.
- */
-
-#ifndef _ASM_TILE_STACK_H
-#define _ASM_TILE_STACK_H
-
-#include <linux/types.h>
-#include <linux/sched.h>
-#include <linux/sched/debug.h>
-
-#include <asm/backtrace.h>
-#include <asm/page.h>
-#include <hv/hypervisor.h>
-
-/* Everything we need to keep track of a backtrace iteration */
-struct KBacktraceIterator {
-	BacktraceIterator it;
-	struct task_struct *task;     /* task we are backtracing */
-	int end;		      /* iteration complete. */
-	int new_context;              /* new context is starting */
-	int profile;                  /* profiling, so stop on async intrpt */
-	int verbose;		      /* printk extra info (don't want to
-				       * do this for profiling) */
-	int is_current;               /* backtracing current task */
-};
-
-/* Iteration methods for kernel backtraces */
-
-/*
- * Initialize a KBacktraceIterator from a task_struct, and optionally from
- * a set of registers.  If the registers are omitted, the process is
- * assumed to be descheduled, and registers are read from the process's
- * thread_struct and stack.  "verbose" means to printk some additional
- * information about fault handlers as we pass them on the stack.
- */
-extern void KBacktraceIterator_init(struct KBacktraceIterator *kbt,
-				    struct task_struct *, struct pt_regs *);
-
-/* Initialize iterator based on current stack. */
-extern void KBacktraceIterator_init_current(struct KBacktraceIterator *kbt);
-
-/* Helper method for above. */
-extern void _KBacktraceIterator_init_current(struct KBacktraceIterator *kbt,
-				ulong pc, ulong lr, ulong sp, ulong r52);
-
-/* No more frames? */
-extern int KBacktraceIterator_end(struct KBacktraceIterator *kbt);
-
-/* Advance to the next frame. */
-extern void KBacktraceIterator_next(struct KBacktraceIterator *kbt);
-
-/* Dump just the contents of the pt_regs structure. */
-extern void tile_show_regs(struct pt_regs *);
-
-/*
- * Dump stack given complete register info. Use only from the
- * architecture-specific code; show_stack()
- * and dump_stack() are architecture-independent entry points.
- */
-extern void tile_show_stack(struct KBacktraceIterator *);
-
-#endif /* _ASM_TILE_STACK_H */