23 Sep, 2010

2 commits

• 4c3ef6d79   jump label: Add jump_label_text_reserved() to reserve jump points ... Browse Code »

  Add a jump_label_text_reserved(void *start, void *end), so that other
  pieces of code that want to modify kernel text, can first verify that
  jump label has not reserved the instruction.

  Acked-by: Masami Hiramatsu
  Signed-off-by: Jason Baron
  LKML-Reference:
  Signed-off-by: Steven Rostedt

  Jason Baron

  2010-09-23 04:30:46 +0800  
• bf5438fca   jump label: Base patch for jump label ... Browse Code »

  base patch to implement 'jump labeling'. Based on a new 'asm goto' inline
  assembly gcc mechanism, we can now branch to labels from an 'asm goto'
  statment. This allows us to create a 'no-op' fastpath, which can subsequently
  be patched with a jump to the slowpath code. This is useful for code which
  might be rarely used, but which we'd like to be able to call, if needed.
  Tracepoints are the current usecase that these are being implemented for.

  Acked-by: David S. Miller
  Signed-off-by: Jason Baron
  LKML-Reference:

  [ cleaned up some formating ]

  Signed-off-by: Steven Rostedt

  Jason Baron

  2010-09-23 04:29:41 +0800