1. 24 May, 2016 39 commits
  2. 23 May, 2016 1 commit
    • Linus Torvalds's avatar
      Merge tag 'trace-v4.7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace · 7639dad9
      Linus Torvalds authored
      Pull motr tracing updates from Steven Rostedt:
       "Three more changes.
      
         - I forgot that I had another selftest to stress test the ftrace
           instance creation.  It was actually suppose to go into the 4.6
           merge window, but I never committed it.  I almost forgot about it
           again, but noticed it was missing from your tree.
      
         - Soumya PN sent me a clean up patch to not disable interrupts when
           taking the tasklist_lock for read, as it's unnecessary because that
           lock is never taken for write in irq context.
      
         - Newer gcc's can cause the jump in the function_graph code to the
           global ftrace_stub label to be a short jump instead of a long one.
           As that jump is dynamically converted to jump to the trace code to
           do function graph tracing, and that conversion expects a long jump
           it can corrupt the ftrace_stub itself (it's directly after that
           call).  One way to prevent gcc from using a short jump is to
           declare the ftrace_stub as a weak function, which we do here to
           keep gcc from optimizing too much"
      
      * tag 'trace-v4.7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
        ftrace/x86: Set ftrace_stub to weak to prevent gcc from using short jumps to it
        ftrace: Don't disable irqs when taking the tasklist_lock read_lock
        ftracetest: Add instance created, delete, read and enable event test
      7639dad9