• Paul Mackerras's avatar
    perf_counter: powerpc: Change how processor-specific back-ends get selected · 079b3c56
    Paul Mackerras authored
    At present, the powerpc generic (processor-independent) perf_counter
    code has list of processor back-end modules, and at initialization,
    it looks at the PVR (processor version register) and has a switch
    statement to select a suitable processor-specific back-end.
    
    This is going to become inconvenient as we add more processor-specific
    back-ends, so this inverts the order: now each back-end checks whether
    it applies to the current processor, and registers itself if so.
    Furthermore, instead of looking at the PVR, back-ends now check the
    cur_cpu_spec->oprofile_cpu_type string and match on that.
    
    Lastly, each back-end now specifies a name for itself so the core can
    print a nice message when a back-end registers itself.
    
    This doesn't provide any support for unregistering back-ends, but that
    wouldn't be hard to do and would allow back-ends to be modules.
    Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: linuxppc-dev@ozlabs.org
    Cc: benh@kernel.crashing.org
    LKML-Reference: <19000.55529.762227.518531@cargo.ozlabs.ibm.com>
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    079b3c56
ppc970-pmu.c 13.2 KB