linux/arch/tile/kernel, branch v3.4-rc2

Merge branch 'stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile

2012-04-07T00:56:20Z

Pull arch/tile bug fixes from Chris Metcalf: "This includes Paul Gortmaker's change to fix the disintegration issues on tile, a fix to unbreak the tilepro ethernet driver, and a backlog of bugfix-only changes from internal Tilera development over the last few months. They have all been to LKML and on linux-next for the last few days. The EDAC change to MAINTAINERS is an oddity but discussion on the linux-edac list suggested I ask you to pull that change through my tree since they don't have a tree to pull edac changes from at the moment." * 'stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile: (39 commits) drivers/net/ethernet/tile: fix netdev_alloc_skb() bombing MAINTAINERS: update EDAC information tilepro ethernet driver: fix a few minor issues tile-srom.c driver: minor code cleanup edac: say "TILEGx" not "TILEPro" for the tilegx edac driver arch/tile: avoid accidentally unmasking NMI-type interrupt accidentally arch/tile: remove bogus performance optimization arch/tile: return SIGBUS for addresses that are unaligned AND invalid arch/tile: fix finv_buffer_remote() for tilegx arch/tile: use atomic exchange in arch_write_unlock() arch/tile: stop mentioning the "kvm" subdirectory arch/tile: export the page_home() function. arch/tile: fix pointer cast in cacheflush.c arch/tile: fix single-stepping over swint1 instructions on tilegx arch/tile: implement panic_smp_self_stop() arch/tile: add "nop" after "nap" to help GX idle power draw arch/tile: use proper memparse() for "maxmem" options arch/tile: fix up locking in pgtable.c slightly arch/tile: don't leak kernel memory when we unload modules arch/tile: fix bug in delay_backoff() ...

arch/tile: avoid accidentally unmasking NMI-type interrupt accidentally

2012-04-02T16:14:03Z

The return path as we reload registers and core state requires that r30 hold a boolean indicating whether we are returning from an NMI, but in a couple of cases we weren't setting this properly, with the result that we could accidentally unmask the NMI interrupt(s), which could cause confusion. Now we set r30 in every place where we jump into the interrupt return path. Signed-off-by: Chris Metcalf

arch/tile: return SIGBUS for addresses that are unaligned AND invalid

2012-04-02T16:13:56Z

Previously we were returning SIGSEGV in this case. It seems cleaner to return SIGBUS since the hardware figures out alignment traps before TLB violations, so SIGBUS is the "more correct" signal. Signed-off-by: Chris Metcalf

arch/tile: fix single-stepping over swint1 instructions on tilegx

2012-04-02T16:13:36Z

If we are single-stepping and make a syscall, we call ptrace_notify() explicitly on the return path back to user space, since we are returning to a pc value set artificially to the next instruction, and otherwise we won't register that we stepped over the syscall instruction (swint1). Signed-off-by: Chris Metcalf

arch/tile: implement panic_smp_self_stop()

2012-04-02T16:13:32Z

This allows the later-panicking tiles to wait in a lower power state until they get interrupted with an smp_send_stop(). Signed-off-by: Chris Metcalf

arch/tile: add "nop" after "nap" to help GX idle power draw

2012-04-02T16:13:29Z

This avoids the hardware istream prefetcher doing unnecessary work. Signed-off-by: Chris Metcalf

arch/tile: use proper memparse() for "maxmem" options

2012-04-02T16:13:25Z

This is more standard and avoids having to remember what units the options actually take. Signed-off-by: Chris Metcalf

arch/tile: don't leak kernel memory when we unload modules

2012-04-02T16:13:19Z

We were failing to track the memory when we allocated it. Signed-off-by: Chris Metcalf

arch/tile: fix a couple of comments that needed updating

2012-04-02T16:12:55Z

Not associated with any code changes, so I'm just lumping these comment changes into a commit by themselves. Signed-off-by: Chris Metcalf

arch/tile: fix up some minor trap handling issues

2012-04-02T16:12:52Z

We now respond to MEM_ERROR traps (e.g. an atomic instruction to non-cacheable memory) with a SIGBUS. We also no longer generate a console crash message if a user process die due to a SIGTRAP. Signed-off-by: Chris Metcalf