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, 85 deletions

diff --git a/arch/tile/lib/memcpy_user_64.c b/arch/tile/lib/memcpy_user_64.c
deleted file mode 100644
index a3fea9fd973e..000000000000
--- a/arch/tile/lib/memcpy_user_64.c
+++ /dev/null
@@ -1,85 +0,0 @@
-/*
- * Copyright 2011 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.
- *
- * Do memcpy(), but trap and return "n" when a load or store faults.
- *
- * Note: this idiom only works when memcpy() compiles to a leaf function.
- * Here leaf function not only means it does not have calls, but also
- * requires no stack operations (sp, stack frame pointer) and no
- * use of callee-saved registers, else "jrp lr" will be incorrect since
- * unwinding stack frame is bypassed. Since memcpy() is not complex so
- * these conditions are satisfied here, but we need to be careful when
- * modifying this file. This is not a clean solution but is the best
- * one so far.
- *
- * Also note that we are capturing "n" from the containing scope here.
- */
-
-#define _ST(p, inst, v)						\
-	({							\
-		asm("1: " #inst " %0, %1;"			\
-		    ".pushsection .coldtext,\"ax\";"	\
-		    "2: { move r0, %2; jrp lr };"		\
-		    ".section __ex_table,\"a\";"		\
-		    ".align 8;"					\
-		    ".quad 1b, 2b;"				\
-		    ".popsection"				\
-		    : "=m" (*(p)) : "r" (v), "r" (n));		\
-	})
-
-#define _LD(p, inst)						\
-	({							\
-		unsigned long __v;				\
-		asm("1: " #inst " %0, %1;"			\
-		    ".pushsection .coldtext,\"ax\";"	\
-		    "2: { move r0, %2; jrp lr };"		\
-		    ".section __ex_table,\"a\";"		\
-		    ".align 8;"					\
-		    ".quad 1b, 2b;"				\
-		    ".popsection"				\
-		    : "=r" (__v) : "m" (*(p)), "r" (n));	\
-		__v;						\
-	})
-
-#define USERCOPY_FUNC raw_copy_to_user
-#define ST1(p, v) _ST((p), st1, (v))
-#define ST2(p, v) _ST((p), st2, (v))
-#define ST4(p, v) _ST((p), st4, (v))
-#define ST8(p, v) _ST((p), st, (v))
-#define LD1 LD
-#define LD2 LD
-#define LD4 LD
-#define LD8 LD
-#include "memcpy_64.c"
-
-#define USERCOPY_FUNC raw_copy_from_user
-#define ST1 ST
-#define ST2 ST
-#define ST4 ST
-#define ST8 ST
-#define LD1(p) _LD((p), ld1u)
-#define LD2(p) _LD((p), ld2u)
-#define LD4(p) _LD((p), ld4u)
-#define LD8(p) _LD((p), ld)
-#include "memcpy_64.c"
-
-#define USERCOPY_FUNC raw_copy_in_user
-#define ST1(p, v) _ST((p), st1, (v))
-#define ST2(p, v) _ST((p), st2, (v))
-#define ST4(p, v) _ST((p), st4, (v))
-#define ST8(p, v) _ST((p), st, (v))
-#define LD1(p) _LD((p), ld1u)
-#define LD2(p) _LD((p), ld2u)
-#define LD4(p) _LD((p), ld4u)
-#define LD8(p) _LD((p), ld)
-#include "memcpy_64.c"