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    Subject[RFC patch 02/15] get_cycles() : x86 HAVE_GET_CYCLES
    This patch selects HAVE_GET_CYCLES and makes sure get_cycles_barrier() and
    get_cycles_rate() are implemented.

    Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
    CC: David Miller <davem@davemloft.net>
    CC: Linus Torvalds <torvalds@linux-foundation.org>
    CC: Andrew Morton <akpm@linux-foundation.org>
    CC: Ingo Molnar <mingo@redhat.com>
    CC: Peter Zijlstra <a.p.zijlstra@chello.nl>
    CC: Thomas Gleixner <tglx@linutronix.de>
    CC: Steven Rostedt <rostedt@goodmis.org>
    CC: linux-arch@vger.kernel.org
    ---
    arch/x86/Kconfig | 1 +
    include/asm-x86/tsc.h | 12 ++++++++++++
    2 files changed, 13 insertions(+)

    Index: linux-2.6-lttng/arch/x86/Kconfig
    ===================================================================
    --- linux-2.6-lttng.orig/arch/x86/Kconfig 2008-10-16 13:07:04.000000000 -0400
    +++ linux-2.6-lttng/arch/x86/Kconfig 2008-10-16 13:07:12.000000000 -0400
    @@ -19,6 +19,7 @@ config X86_64
    config X86
    def_bool y
    select HAVE_UNSTABLE_SCHED_CLOCK
    + select HAVE_GET_CYCLES
    select HAVE_IDE
    select HAVE_OPROFILE
    select HAVE_IOREMAP_PROT
    Index: linux-2.6-lttng/include/asm-x86/tsc.h
    ===================================================================
    --- linux-2.6-lttng.orig/include/asm-x86/tsc.h 2008-10-16 13:07:04.000000000 -0400
    +++ linux-2.6-lttng/include/asm-x86/tsc.h 2008-10-16 13:07:24.000000000 -0400
    @@ -50,6 +50,18 @@ extern void mark_tsc_unstable(char *reas
    extern int unsynchronized_tsc(void);
    int check_tsc_unstable(void);

    +static inline cycles_t get_cycles_rate(void)
    +{
    + if (check_tsc_unstable())
    + return 0;
    + return tsc_khz;
    +}
    +
    +static inline void get_cycles_barrier(void)
    +{
    + rdtsc_barrier();
    +}
    +
    /*
    * Boot-time check whether the TSCs are synchronized across
    * all CPUs/cores:
    --
    Mathieu Desnoyers
    Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
    OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68


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