[PATCH v7 0/9] tracing: MIPS: add misc fixups and cleanups

[Wu Zhangjin <wuzhangjin@gmail.com>]

From: Wu Zhangjin <wuzhangjin@gmail.com>

This patchset adds misc fixups and cleanups for Ftrace of MIPS:

  + Fix the support of 32bit support with -mmcount-ra-address of gcc 4.5
    o tracing: MIPS: mcount.S: Fix the argument passing of the 32bit support with
      gcc 4.5, The argument is passed by $12 in 32bit, not t0.
    o tracing: MIPS: Fixup of the 32bit support with -mmcount-ra-address
      For 32bit kernel, the offset of "b 1f" should be 5 instructions, not only 4.
 
  + Speedup the dynamic function tracer
    o tracing: MIPS: Reduce the overhead of dynamic Function Tracer
      In the old implementation, we have encode the 'nop' instruction and the
      instruction of calling to mcount at run-time, which may add some
      overhead.  We reduce this overhead via encoding them when initializing
      the dynamic function tracer.

  + Lots of cleanups
    o The other patches.

----------------
v6 -> v7:

  o Apply the feedback from David Daney:
  define a macro MCOUNT_RA_ADDRESS_REG instead of the magic number $12 for the patch
  "tracing: MIPS: mcount.S: Fix the argument passing of the 32bit
    support with gcc 4.5"

v5 -> v6:

  o splits up the old v5 revision into several patches to make the maintainer
  happier to review it.

Regards,
        Wu Zhangjin


Wu Zhangjin (9):
  tracing: MIPS: mcount.S: merge the same continuous #ifdefs
  tracing: MIPS: mcount.S: cleanup the arguments of
    prepare_ftrace_return
  tracing: MIPS: mcount.S: cleanup of the comments
  tracing: MIPS: mcount.S: Fix the argument passing of the 32bit
    support with gcc 4.5
  tracing: MIPS: Fixup of the 32bit support with -mmcount-ra-address
  tracing: MIPS: cleanup of the instructions
  tracing: MIPS: Reduce the overhead of dynamic Function Tracer
  tracing: MIPS: cleanup of function graph tracer
  tracing: MIPS: cleanup of the address space checking

 arch/mips/kernel/ftrace.c |  184 +++++++++++++++++++++++++++------------------
 arch/mips/kernel/mcount.S |   55 ++++++++-----
 2 files changed, 146 insertions(+), 93 deletions(-)