1. 01 May, 2016 38 commits
  2. 27 Apr, 2016 1 commit
  3. 26 Apr, 2016 1 commit
    • Thiago Jung Bauermann's avatar
      ftrace: Match dot symbols when searching functions on ppc64 · 7132e2d6
      Thiago Jung Bauermann authored
      In the ppc64 big endian ABI, function symbols point to function
      descriptors. The symbols which point to the function entry points
      have a dot in front of the function name. Consequently, when the
      ftrace filter mechanism searches for the symbol corresponding to
      an entry point address, it gets the dot symbol.
      
      As a result, ftrace filter users have to be aware of this ABI detail on
      ppc64 and prepend a dot to the function name when setting the filter.
      
      The perf probe command insulates the user from this by ignoring the dot
      in front of the symbol name when matching function names to symbols,
      but the sysfs interface does not. This patch makes the ftrace filter
      mechanism do the same when searching symbols.
      
      Fixes the following failure in ftracetest's kprobe_ftrace.tc:
      
        .../kprobe_ftrace.tc: line 9: echo: write error: Invalid argument
      
      That failure is on this line of kprobe_ftrace.tc:
      
        echo _do_fork > set_ftrace_filter
      
      This is because there's no _do_fork entry in the functions list:
      
        # cat available_filter_functions | grep _do_fork
        ._do_fork
      
      This change introduces no regressions on the perf and ftracetest
      testsuite results.
      
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Michael Ellerman <mpe@ellerman.id.au>
      Cc: linuxppc-dev@lists.ozlabs.org
      Signed-off-by: default avatarThiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
      Acked-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      7132e2d6