tile: fix multiple build failures from system.h dismantle

Commit bd119c69239322caafdb64517a806037d0d0c70a

    "Disintegrate asm/system.h for Tile"

created the asm/switch_to.h file, but did not add an include
of it to all its users.

Also, commit b4816afa3986704d1404fc48e931da5135820472

        "Move the asm-generic/system.h xchg() implementation to asm-generic/cmpxchg.h"

introduced the concept of asm/cmpxchg.h but the tile arch
never got one.  Fork the cmpxchg content out of the asm/atomic.h
file to create one.

Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

4 files changed, 77 insertions, 48 deletions

diff --git a/arch/tile/include/asm/atomic.h b/arch/tile/include/asm/atomic.h
index bb696da5d7cd..f2461429a4a4 100644
--- a/arch/tile/include/asm/atomic.h
+++ b/arch/tile/include/asm/atomic.h
@@ -17,6 +17,8 @@
 #ifndef _ASM_TILE_ATOMIC_H
 #define _ASM_TILE_ATOMIC_H
 
+#include <asm/cmpxchg.h>
+
 #ifndef __ASSEMBLY__
 
 #include <linux/compiler.h>
@@ -121,54 +123,6 @@ static inline int atomic_read(const atomic_t *v)
  */
 #define atomic_add_negative(i, v)       (atomic_add_return((i), (v)) < 0)
 
-/* Nonexistent functions intended to cause link errors. */
-extern unsigned long __xchg_called_with_bad_pointer(void);
-extern unsigned long __cmpxchg_called_with_bad_pointer(void);
-
-#define xchg(ptr, x)                                                    \
-        ({                                                              \
-                typeof(*(ptr)) __x;                                     \
-                switch (sizeof(*(ptr))) {                               \
-                case 4:                                                 \
-                        __x = (typeof(__x))(typeof(__x-__x))atomic_xchg( \
-                                (atomic_t *)(ptr),                      \
-                                (u32)(typeof((x)-(x)))(x));             \
-                        break;                                          \
-                case 8:                                                 \
-                        __x = (typeof(__x))(typeof(__x-__x))atomic64_xchg( \
-                                (atomic64_t *)(ptr),                    \
-                                (u64)(typeof((x)-(x)))(x));             \
-                        break;                                          \
-                default:                                                \
-                        __xchg_called_with_bad_pointer();               \
-                }                                                       \
-                __x;                                                    \
-        })
-
-#define cmpxchg(ptr, o, n)                                              \
-        ({                                                              \
-                typeof(*(ptr)) __x;                                     \
-                switch (sizeof(*(ptr))) {                               \
-                case 4:                                                 \
-                        __x = (typeof(__x))(typeof(__x-__x))atomic_cmpxchg( \
-                                (atomic_t *)(ptr),                      \
-                                (u32)(typeof((o)-(o)))(o),              \
-                                (u32)(typeof((n)-(n)))(n));             \
-                        break;                                          \
-                case 8:                                                 \
-                        __x = (typeof(__x))(typeof(__x-__x))atomic64_cmpxchg( \
-                                (atomic64_t *)(ptr),                    \
-                                (u64)(typeof((o)-(o)))(o),              \
-                                (u64)(typeof((n)-(n)))(n));             \
-                        break;                                          \
-                default:                                                \
-                        __cmpxchg_called_with_bad_pointer();            \
-                }                                                       \
-                __x;                                                    \
-        })
-
-#define tas(ptr) (xchg((ptr), 1))
-
 #endif /* __ASSEMBLY__ */
 
 #ifndef __tilegx__
diff --git a/arch/tile/include/asm/cmpxchg.h b/arch/tile/include/asm/cmpxchg.h
new file mode 100644
index 000000000000..276f067e3640
--- /dev/null
+++ b/arch/tile/include/asm/cmpxchg.h
@@ -0,0 +1,73 @@
+/*
+ * cmpxchg.h -- forked from asm/atomic.h with this copyright:
+ *
+ * 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_CMPXCHG_H
+#define _ASM_TILE_CMPXCHG_H
+
+#ifndef __ASSEMBLY__
+
+/* Nonexistent functions intended to cause link errors. */
+extern unsigned long __xchg_called_with_bad_pointer(void);
+extern unsigned long __cmpxchg_called_with_bad_pointer(void);
+
+#define xchg(ptr, x)                                                    \
+        ({                                                              \
+                typeof(*(ptr)) __x;                                     \
+                switch (sizeof(*(ptr))) {                               \
+                case 4:                                                 \
+                        __x = (typeof(__x))(typeof(__x-__x))atomic_xchg( \
+                                (atomic_t *)(ptr),                      \
+                                (u32)(typeof((x)-(x)))(x));             \
+                        break;                                          \
+                case 8:                                                 \
+                        __x = (typeof(__x))(typeof(__x-__x))atomic64_xchg( \
+                                (atomic64_t *)(ptr),                    \
+                                (u64)(typeof((x)-(x)))(x));             \
+                        break;                                          \
+                default:                                                \
+                        __xchg_called_with_bad_pointer();               \
+                }                                                       \
+                __x;                                                    \
+        })
+
+#define cmpxchg(ptr, o, n)                                              \
+        ({                                                              \
+                typeof(*(ptr)) __x;                                     \
+                switch (sizeof(*(ptr))) {                               \
+                case 4:                                                 \
+                        __x = (typeof(__x))(typeof(__x-__x))atomic_cmpxchg( \
+                                (atomic_t *)(ptr),                      \
+                                (u32)(typeof((o)-(o)))(o),              \
+                                (u32)(typeof((n)-(n)))(n));             \
+                        break;                                          \
+                case 8:                                                 \
+                        __x = (typeof(__x))(typeof(__x-__x))atomic64_cmpxchg( \
+                                (atomic64_t *)(ptr),                    \
+                                (u64)(typeof((o)-(o)))(o),              \
+                                (u64)(typeof((n)-(n)))(n));             \
+                        break;                                          \
+                default:                                                \
+                        __cmpxchg_called_with_bad_pointer();            \
+                }                                                       \
+                __x;                                                    \
+        })
+
+#define tas(ptr) (xchg((ptr), 1))
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _ASM_TILE_CMPXCHG_H */
diff --git a/arch/tile/kernel/process.c b/arch/tile/kernel/process.c
index 30caecac94dc..ee01b1c683e4 100644
--- a/arch/tile/kernel/process.c
+++ b/arch/tile/kernel/process.c
@@ -28,6 +28,7 @@
 #include <linux/tracehook.h>
 #include <linux/signal.h>
 #include <asm/stack.h>
+#include <asm/switch_to.h>
 #include <asm/homecache.h>
 #include <asm/syscalls.h>
 #include <asm/traps.h>
diff --git a/arch/tile/kernel/stack.c b/arch/tile/kernel/stack.c
index 37ee4d037e0b..0be6b0109ce0 100644
--- a/arch/tile/kernel/stack.c
+++ b/arch/tile/kernel/stack.c
@@ -25,6 +25,7 @@
 #include <asm/page.h>
 #include <asm/tlbflush.h>
 #include <asm/ucontext.h>
+#include <asm/switch_to.h>
 #include <asm/sigframe.h>
 #include <asm/stack.h>
 #include <arch/abi.h>