c6x: remove architecture

The c6x architecture was added to the kernel in 2011 at a time when
running Linux on DSPs was widely seen as the logical evolution.
It appears the trend has gone back to running Linux on Arm based SoCs
with DSP, using a better supported software ecosystem, and having better
real-time behavior for the DSP code. An example of this is TI's own
Keystone2 platform.

The upstream kernel port appears to no longer have any users. Mark
Salter remained avaialable to review patches, but mentioned that
he no longer has access to working hardware himself. Without any
users, it's best to just remove the code completely to reduce the
work for cross-architecture code changes.

Many thanks to Mark for maintaining the code for the past ten years.

Link: https://lore.kernel.org/lkml/41dc7795afda9f776d8cd0d3075f776cf586e97c.camel@redhat.com/
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 0 insertions, 63 deletions

diff --git a/arch/c6x/include/asm/cmpxchg.h b/arch/c6x/include/asm/cmpxchg.h
deleted file mode 100644
index 6eed628a9e7f..000000000000
--- a/arch/c6x/include/asm/cmpxchg.h
+++ /dev/null
@@ -1,63 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- *  Port on Texas Instruments TMS320C6x architecture
- *
- *  Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
- *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
- */
-#ifndef _ASM_C6X_CMPXCHG_H
-#define _ASM_C6X_CMPXCHG_H
-
-#include <linux/irqflags.h>
-
-/*
- * Misc. functions
- */
-static inline unsigned int __xchg(unsigned int x, volatile void *ptr, int size)
-{
-	unsigned int tmp;
-	unsigned long flags;
-
-	local_irq_save(flags);
-
-	switch (size) {
-	case 1:
-		tmp = 0;
-		tmp = *((unsigned char *) ptr);
-		*((unsigned char *) ptr) = (unsigned char) x;
-		break;
-	case 2:
-		tmp = 0;
-		tmp = *((unsigned short *) ptr);
-		*((unsigned short *) ptr) = x;
-		break;
-	case 4:
-		tmp = 0;
-		tmp = *((unsigned int *) ptr);
-		*((unsigned int *) ptr) = x;
-		break;
-	}
-	local_irq_restore(flags);
-	return tmp;
-}
-
-#define xchg(ptr, x) \
-	((__typeof__(*(ptr)))__xchg((unsigned int)(x), (void *) (ptr), \
-				    sizeof(*(ptr))))
-
-#include <asm-generic/cmpxchg-local.h>
-
-/*
- * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
- * them available.
- */
-#define cmpxchg_local(ptr, o, n)					\
-	((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr),		\
-						     (unsigned long)(o), \
-						     (unsigned long)(n), \
-						     sizeof(*(ptr))))
-#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
-
-#include <asm-generic/cmpxchg.h>
-
-#endif /* _ASM_C6X_CMPXCHG_H */