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    Subject[RFC PATCH 0/0 v3] callchain fixes and cleanups

    This set factorizes a lot of callchain code and fixes concurrent
    callchain buffers accesses.

    The previous set has revealed we can't decently use the per cpu
    allocation api for memory that can be accessed from NMI.
    Hence this temporary uses a manual per cpu allocation until that
    gets fixed up.

    Built-tested on PowerPc, Arm and SuperH (can someone point me to
    a ready to use sparc cross compiler, like those that can be found
    there for other archs: ?)

    And runtime tested on x86-64 withiut troubles.

    You can test it by pulling that branch:


    If you have no comments, I'll propose it to -tip in a few days.


    Frederic Weisbecker (6):
    perf: Drop unappropriate tests on arch callchains
    perf: Generalize callchain_store()
    perf: Generalize some arch callchain code
    perf: Factorize callchain context handling
    perf: Fix race in callchains
    perf: Humanize the number of contexts

    arch/arm/kernel/perf_event.c | 62 +---------
    arch/powerpc/kernel/perf_callchain.c | 86 ++++---------
    arch/sh/kernel/perf_callchain.c | 50 +-------
    arch/sparc/kernel/perf_event.c | 69 ++++-------
    arch/x86/kernel/cpu/perf_event.c | 82 +++----------
    include/linux/perf_event.h | 30 ++++-
    kernel/perf_event.c | 226 +++++++++++++++++++++++++++++-----
    7 files changed, 295 insertions(+), 310 deletions(-)

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