Remove dma_cache_(wback|inv|wback_inv) functions

dma_cache_(wback|inv|wback_inv) were the earliest attempt on a generalized
cache managment API for I/O purposes.  Originally it was basically the raw
MIPS low level cache API exported to the entire world.  The API has
suffered from a lack of documentation, was not very widely used unlike it's
more modern brothers and can easily be replaced by dma_cache_sync.  So
remove it rsp.  turn the surviving bits back into an arch private API, as
discussed on linux-arch.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Acked-by: Paul Mundt <lethal@linux-sh.org>
Acked-by: Paul Mackerras <paulus@samba.org>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Kyle McMartin <kyle@parisc-linux.org>
Acked-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 1 insertions, 16 deletions

diff --git a/include/asm-x86/io_32.h b/include/asm-x86/io_32.h
index e8e0bd641120..4ea7b1ad3c1d 100644
--- a/include/asm-x86/io_32.h
+++ b/include/asm-x86/io_32.h
@@ -237,18 +237,9 @@ static inline void flush_write_buffers(void)
         __asm__ __volatile__ ("lock; addl $0,0(%%esp)": : :"memory");
 }
 
-#define dma_cache_inv(_start,_size)             flush_write_buffers()
-#define dma_cache_wback(_start,_size)           flush_write_buffers()
-#define dma_cache_wback_inv(_start,_size)       flush_write_buffers()
-
 #else
 
-/* Nothing to do */
-
-#define dma_cache_inv(_start,_size)             do { } while (0)
-#define dma_cache_wback(_start,_size)           do { } while (0)
-#define dma_cache_wback_inv(_start,_size)       do { } while (0)
-#define flush_write_buffers()
+#define flush_write_buffers() do { } while (0)
 
 #endif
 
diff --git a/include/asm-x86/io_64.h b/include/asm-x86/io_64.h
index 7475095c5061..a037b0794332 100644
--- a/include/asm-x86/io_64.h
+++ b/include/asm-x86/io_64.h
@@ -249,12 +249,6 @@ void memset_io(volatile void __iomem *a, int b, size_t c);
  */
 #define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET))
 
-/* Nothing to do */
-
-#define dma_cache_inv(_start,_size)             do { } while (0)
-#define dma_cache_wback(_start,_size)           do { } while (0)
-#define dma_cache_wback_inv(_start,_size)       do { } while (0)
-
 #define flush_write_buffers() 
 
 extern int iommu_bio_merge;