linux/arch/tile/lib, branch v3.8

tile: export a handful of symbols appropriately

2013-02-08T18:20:36Z

This was shown up by running with "allmodconfig". I used EXPORT_SYMBOL() to match existing conventions in files that were already exporting symbols, or that were exported that way by other architectures, and otherwise EXPORT_SYMBOL_GPL(). Signed-off-by: Chris Metcalf

arch/tile: break out the "csum a long" function to

2012-07-11T20:04:57Z

This makes it available to the tilegx network driver. Signed-off-by: Chris Metcalf

arch/tile: Allow tilegx to build with either 16K or 64K page size

2012-05-25T16:48:24Z

This change introduces new flags for the hv_install_context() API that passes a page table pointer to the hypervisor. Clients can explicitly request 4K, 16K, or 64K small pages when they install a new context. In practice, the page size is fixed at kernel compile time and the same size is always requested every time a new page table is installed. The header changes so that it provides more abstract macros for managing "page" things like PFNs and page tables. For example there is now a HV_DEFAULT_PAGE_SIZE_SMALL instead of the old HV_PAGE_SIZE_SMALL. The various PFN routines have been eliminated and only PA- or PTFN-based ones remain (since PTFNs are always expressed in fixed 2KB "page" size). The page-table management macros are renamed with a leading underscore and take page-size arguments with the presumption that clients will use those macros in some single place to provide the "real" macros they will use themselves. I happened to notice the old hv_set_caching() API was totally broken (it assumed 4KB pages) so I changed it so it would nominally work correctly with other page sizes. Tag modules with the page size so you can't load a module built with a conflicting page size. (And add a test for SMP while we're at it.) Signed-off-by: Chris Metcalf

arch/tile: optimize get_user/put_user and friends

2012-05-25T16:48:23Z

Use direct load/store for the get_user/put_user. Previously, we would call out to a helper routine that would do the appropriate thing and then return, handling the possible exception internally. Now we inline the load or store, along with a "we succeeded" indication in a register; if the load or store faults, we write a "we failed" indication into the same register and then return to the following instruction. This is more efficient and gives us more compact code, as well as being more in line with what other architectures do. The special futex assembly source file for TILE-Gx also disappears in this change; we just use the same inlining idiom there as well, putting the appropriate atomic operations directly into futex_atomic_op_inuser() (and thus into the FUTEX_WAIT function). The underlying atomic copy_from_user, copy_to_user functions were renamed using the (cryptic) x86 convention as copy_from_user_ll and copy_to_user_ll. Signed-off-by: Chris Metcalf

arch/tile: support building big-endian kernel

2012-05-25T16:48:22Z

The toolchain supports big-endian mode now, so add support for building the kernel to run big-endian as well. Signed-off-by: Chris Metcalf

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: fix bug in delay_backoff()

2012-04-02T16:13:15Z

We were carefully computing a value to use for the number of loops to spin for, and then ignoring it. Signed-off-by: Chris Metcalf

arch/tile: make sure to build memcpy_user_64 without frame pointer

2012-04-02T16:12:42Z

Add a comment explaining why this is important, and add a CFLAGS_REMOVE clause to the Makefile to make sure it happens. Signed-off-by: Chris Metcalf

arch/tile: misplaced parens near likely

2012-03-12T19:32:18Z

Parentheses were missing. Signed-off-by: Roel Kluin Signed-off-by: Chris Metcalf