metag: Remove arch/metag/

The earliest Meta architecture port of Linux I have a record of was an
import of a Meta port of Linux v2.4.1 in February 2004, which was worked
on significantly over the next few years by Graham Whaley, Will Newton,
Matt Fleming, myself and others.

Eventually the port was merged into mainline in v3.9 in March 2013, not
long after Imagination Technologies bought MIPS Technologies and shifted
its CPU focus over to the MIPS architecture.

As a result, though the port was maintained for a while, kept on life
support for a while longer, and useful for testing a few specific
drivers for which I don't have ready access to the equivalent MIPS
hardware, it is now essentially dead with no users.

It is also stuck using an out-of-tree toolchain based on GCC 4.2.4 which
is no longer maintained, now struggles to build modern kernels due to
toolchain bugs, and doesn't itself build with a modern GCC. The latest
buildroot port is still using an old uClibc snapshot which is no longer
served, and the latest uClibc doesn't build with GCC 4.2.4.

So lets call it a day and drop the Meta architecture port from the
kernel. RIP Meta.

Signed-off-by: James Hogan <jhogan@kernel.org>
Link: https://lkml.kernel.org/r/95906b76-6ce1-3f84-eaba-c29b4ae952eb@roeck-us.net
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Graham Whaley <graham.whaley@gmail.com>
Cc: linux-metag@vger.kernel.org

1 files changed, 0 insertions, 157 deletions

diff --git a/arch/metag/include/asm/atomic_lock1.h b/arch/metag/include/asm/atomic_lock1.h
deleted file mode 100644
index 2ce8fa3a79c2..000000000000
--- a/arch/metag/include/asm/atomic_lock1.h
+++ /dev/null
@@ -1,157 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef __ASM_METAG_ATOMIC_LOCK1_H
-#define __ASM_METAG_ATOMIC_LOCK1_H
-
-#define ATOMIC_INIT(i)	{ (i) }
-
-#include <linux/compiler.h>
-
-#include <asm/barrier.h>
-#include <asm/global_lock.h>
-
-static inline int atomic_read(const atomic_t *v)
-{
-	return READ_ONCE((v)->counter);
-}
-
-/*
- * atomic_set needs to be take the lock to protect atomic_add_unless from a
- * possible race, as it reads the counter twice:
- *
- *  CPU0                               CPU1
- *  atomic_add_unless(1, 0)
- *    ret = v->counter (non-zero)
- *    if (ret != u)                    v->counter = 0
- *      v->counter += 1 (counter set to 1)
- *
- * Making atomic_set take the lock ensures that ordering and logical
- * consistency is preserved.
- */
-static inline int atomic_set(atomic_t *v, int i)
-{
-	unsigned long flags;
-
-	__global_lock1(flags);
-	fence();
-	v->counter = i;
-	__global_unlock1(flags);
-	return i;
-}
-
-#define atomic_set_release(v, i) atomic_set((v), (i))
-
-#define ATOMIC_OP(op, c_op)						\
-static inline void atomic_##op(int i, atomic_t *v)			\
-{									\
-	unsigned long flags;						\
-									\
-	__global_lock1(flags);						\
-	fence();							\
-	v->counter c_op i;						\
-	__global_unlock1(flags);					\
-}									\
-
-#define ATOMIC_OP_RETURN(op, c_op)					\
-static inline int atomic_##op##_return(int i, atomic_t *v)		\
-{									\
-	unsigned long result;						\
-	unsigned long flags;						\
-									\
-	__global_lock1(flags);						\
-	result = v->counter;						\
-	result c_op i;							\
-	fence();							\
-	v->counter = result;						\
-	__global_unlock1(flags);					\
-									\
-	return result;							\
-}
-
-#define ATOMIC_FETCH_OP(op, c_op)					\
-static inline int atomic_fetch_##op(int i, atomic_t *v)			\
-{									\
-	unsigned long result;						\
-	unsigned long flags;						\
-									\
-	__global_lock1(flags);						\
-	result = v->counter;						\
-	fence();							\
-	v->counter c_op i;						\
-	__global_unlock1(flags);					\
-									\
-	return result;							\
-}
-
-#define ATOMIC_OPS(op, c_op)						\
-	ATOMIC_OP(op, c_op)						\
-	ATOMIC_OP_RETURN(op, c_op)					\
-	ATOMIC_FETCH_OP(op, c_op)
-
-ATOMIC_OPS(add, +=)
-ATOMIC_OPS(sub, -=)
-
-#undef ATOMIC_OPS
-#define ATOMIC_OPS(op, c_op)						\
-	ATOMIC_OP(op, c_op)						\
-	ATOMIC_FETCH_OP(op, c_op)
-
-ATOMIC_OPS(and, &=)
-ATOMIC_OPS(or, |=)
-ATOMIC_OPS(xor, ^=)
-
-#undef ATOMIC_OPS
-#undef ATOMIC_FETCH_OP
-#undef ATOMIC_OP_RETURN
-#undef ATOMIC_OP
-
-static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
-{
-	int ret;
-	unsigned long flags;
-
-	__global_lock1(flags);
-	ret = v->counter;
-	if (ret == old) {
-		fence();
-		v->counter = new;
-	}
-	__global_unlock1(flags);
-
-	return ret;
-}
-
-#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
-
-static inline int __atomic_add_unless(atomic_t *v, int a, int u)
-{
-	int ret;
-	unsigned long flags;
-
-	__global_lock1(flags);
-	ret = v->counter;
-	if (ret != u) {
-		fence();
-		v->counter += a;
-	}
-	__global_unlock1(flags);
-
-	return ret;
-}
-
-static inline int atomic_sub_if_positive(int i, atomic_t *v)
-{
-	int ret;
-	unsigned long flags;
-
-	__global_lock1(flags);
-	ret = v->counter - 1;
-	if (ret >= 0) {
-		fence();
-		v->counter = ret;
-	}
-	__global_unlock1(flags);
-
-	return ret;
-}
-
-#endif /* __ASM_METAG_ATOMIC_LOCK1_H */