litmus-rt.git/arch/sparc/lib, branch linux-tip

sparc64: Make lock backoff really a NOP on UP builds.

2010-08-19T05:53:26+00:00

As noticed by Mikulas Patocka, the backoff macros don't
completely nop out for UP builds, we still get a
branch always and a delay slot nop.

Fix this by making the branch to the backoff spin loop
selective, then we can nop out the spin loop completely.

Signed-off-by: David S. Miller

sparc64: simple microoptimizations for atomic functions

2010-08-19T05:51:08+00:00

Simple microoptimizations for sparc64 atomic functions:
Save one instruction by using a delay slot.
Use %g1 instead of %g7, because %g1 is written earlier.

Signed-off-by: Mikulas Patocka 
Signed-off-by: David S. Miller

sparc64: Make rwsems 64-bit.

2010-08-18T05:49:26+00:00

Basically tip-off the powerpc code, use a 64-bit type and atomic64_t
interfaces for the implementation.

This gets us off of the by-hand asm code I wrote, which frankly I
think probably ruins I-cache hit rates.

The idea was the keep the call chains less deep, but anything taking
the rw-semaphores probably is also calling other stuff and therefore
already has allocated a stack-frame.  So no real stack frame savings
ever.

Ben H. has posted patches to make powerpc use 64-bit too and with some
abstractions we can probably use a shared header file somewhere.

With suggestions from Sam Ravnborg.

Signed-off-by: David S. Miller

sparc64: Allocate sufficient stack space in ftrace stubs.

2010-04-14T01:59:02+00:00

128 bytes is sufficient for the register window save area, but the
calling conventions allow the callee to save up to 6 incoming argument
registers into the stack frame after the register window save area.

This means a minimal stack frame is 176 bytes (128 + (6 * 8)).

This fixes random crashes when using the function tracer.

Reported-by: Frederic Weisbecker 
Signed-off-by: David S. Miller

sparc64: Add function graph tracer support.

2010-04-13T05:37:26+00:00

Signed-off-by: David S. Miller

sparc64: Give a stack frame to the ftrace call sites.

2010-04-13T05:37:15+00:00

It's the only way we'll be able to implement the function
graph tracer properly.

A positive is that we no longer have to worry about the
linker over-optimizing the tail call, since we don't
use a tail call any more.

Signed-off-by: David S. Miller

sparc64: Kill CONFIG_STACK_DEBUG code.

2010-04-13T05:36:03+00:00

The generic stack tracer does this job just as well.

Signed-off-by: David S. Miller

sparc64: Add HAVE_FUNCTION_TRACE_MCOUNT_TEST and tidy up.

2010-04-13T05:35:24+00:00

Check function_trace_stop at ftrace_caller

Toss mcount_call and dummy call of ftrace_stub, unnecessary.

Document problems we'll have if the final kernel image link
ever turns on relaxation.

Properly size 'ftrace_call' so it looks right when inspecting
instructions under gdb et al.

Signed-off-by: David S. Miller

sparc: Stop trying to be so fancy and use __builtin_{memcpy,memset}()

2009-12-11T07:32:10+00:00

This mirrors commit ff60fab71bb3b4fdbf8caf57ff3739ffd0887396
(x86: Use __builtin_memset and __builtin_memcpy for memset/memcpy)

Signed-off-by: David S. Miller

sparc: Use __builtin_object_size() to validate the buffer size for copy_from_user()

2009-12-11T07:05:23+00:00

This mirrors x86 commit 9f0cf4adb6aa0bfccf675c938124e68f7f06349d
(x86: Use __builtin_object_size() to validate the buffer size for copy_from_user())

Signed-off-by: David S. Miller