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    SubjectRe: [RFC GIT PULL] x86 entry / perf stacktrace changes

    * Frederic Weisbecker <fweisbec@gmail.com> wrote:

    > Ingo,
    >
    > Please pull the perf/stacktrace branch that can be found at:
    >
    > git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing.git
    > perf/stacktrace
    >
    > Or may be not yet. It's still in RFC because I would like
    > to ensure I did not break cfi annotations. I hope Jan beulich
    > or others can have a look.
    >
    > Sorry to mess up irq entry and perf stacktrace changes in the same
    > topic. But the changes happen to be very interconnected.
    >
    > Several cleanups, fixes and optimizations for the x86-64
    > stacktraces and irq entry.
    >
    > Last patch seems to add a bit of overhead in the irq entry
    > (one more "push") but given the changes made in previous
    > patches, the end result is a more optimized and more clear irq
    > entry.
    >
    > Thanks,
    > Frederic
    > ---
    >
    > Frederic Weisbecker (6):
    > x86: Save stack pointer in perf live regs savings
    > x86: Fetch stack from regs when possible in dump_trace()
    > x86,64: Simplify save_regs()
    > x86,64: Separate arg1 from rbp handling in SAVE_REGS_IRQ
    > x86: Remove useless unwinder backlink from irq regs saving
    > x86: Don't use frame pointer to save old stack on irq entry
    >
    >
    > arch/x86/include/asm/perf_event.h | 5 +++
    > arch/x86/kernel/dumpstack_64.c | 37 +++-----------------
    > arch/x86/kernel/entry_64.S | 69 ++++++++++++++++--------------------
    > 3 files changed, 41 insertions(+), 70 deletions(-)

    Pulled, thanks a lot Frederic! The irq backtrace fixes look pretty
    important - if there's any CFI annotation detail to be fixed we can
    do it in a delta.

    Thanks,

    Ingo


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