• Jiri Olsa's avatar
    perf tools: Add is_compressed callback to compressions array · 8b42b7e5
    Jiri Olsa authored
    Add is_compressed callback to the compressions array, that returns 0 if
    the file is compressed or != 0 if not.
    
    The new callback is used to recognize the situation when we have a
    'compressed' object, like:
    
      /lib/modules/.../drivers/net/ethernet/intel/igb/igb.ko.xz
    
    but we need to read its debug data from debuginfo files, which might not
    be compressed, like:
    
      /root/.debug/.build-id/d6/...c4b301f/debug
    
    So even for a 'compressed' object we read debug data from a plain
    uncompressed object. To keep this transparent, we detect this in
    decompress_kmodule() and return the file descriptor to the uncompressed
    file.
    Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
    Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
    Cc: David Ahern <dsahern@gmail.com>
    Cc: Michael Petlan <mpetlan@redhat.com>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Link: http://lkml.kernel.org/r/20180817094813.15086-11-jolsa@kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    8b42b7e5
lzma.c 2.25 KB