linux/arch/tile/lib/cacheflush.c, branch v3.4-rc2

arch/tile: fix finv_buffer_remote() for tilegx

2012-04-02T16:13:53Z

There were some correctness issues with this code that are now fixed with this change. The change is likely less performant than it could be, but it should no longer be vulnerable to any races with memory operations on the memory network while invalidating a range of memory. This code is run infrequently so performance isn't critical, but correctness definitely is. Signed-off-by: Chris Metcalf

arch/tile: fix pointer cast in cacheflush.c

2012-04-02T16:13:39Z

Pragmatically it couldn't be wrong to cast pointers to long to compare them (since all kernel addresses are in the top half of VA space), but it's more correct to cast to unsigned long. Signed-off-by: Chris Metcalf

arch/tile: disable GX prefetcher during cache flush

2011-05-04T18:40:46Z

Otherwise, it's possible to end up with the prefetcher pulling data into cache that the code believes has been flushed. Signed-off-by: Chris Metcalf

arch/tile: enhance existing finv_buffer_remote() routine

2011-03-01T21:21:06Z

It now takes an additional argument so it can be used to flush-and-invalidate pages that are cached using hash-for-home as well those that are cached with coherence point on a single cpu. This allows it to be used more widely for changing the coherence point of arbitrary pages when necessary. Signed-off-by: Chris Metcalf

arch/tile: Split the icache flush code off to a generic header.

2010-07-06T17:41:46Z

This code is used in other places in our system than in Linux, so to share it we now implement it as an inline function in our low-level headers, and instantiate it in one file in Linux's arch/tile/lib. The file is now cacheflush.c and is C code rather than the strangely-named and assembler-implemented __invalidate_icache.S. Signed-off-by: Chris Metcalf Acked-by: Arnd Bergmann