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    Subject[RFC][PATCH 3/8] sched,idle,ia64: Switch from TS_POLLING to TIF_POLLING_NRFLAG
    Standardize the idle polling indicator to TIF_POLLING_NRFLAG such that
    both TIF_NEED_RESCHED and TIF_POLLING_NRFLAG are in the same word.
    This will allow us, using fetch_or(), to both set NEED_RESCHED and
    check for POLLING_NRFLAG in a single operation and avoid pointless
    wakeups.

    Changing from the non-atomic thread_info::status flags to the atomic
    thread_info::flags shouldn't be a big issue since most polling state
    changes were followed/preceded by a full memory barrier anyway.

    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Andy Lutomirski <luto@amacapital.net>
    Cc: Tony Luck <tony.luck@intel.com>
    Signed-off-by: Peter Zijlstra <peterz@infradead.org>
    ---
    arch/ia64/include/asm/thread_info.h | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    --- a/arch/ia64/include/asm/thread_info.h
    +++ b/arch/ia64/include/asm/thread_info.h
    @@ -107,6 +107,7 @@ struct thread_info {
    #define TIF_MCA_INIT 18 /* this task is processing MCA or INIT */
    #define TIF_DB_DISABLED 19 /* debug trap disabled for fsyscall */
    #define TIF_RESTORE_RSE 21 /* user RBS is newer than kernel RBS */
    +#define TIF_POLLING_NRFLAG 22 /* idle is polling for TIF_NEED_RESCHED */

    #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
    #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
    @@ -118,6 +119,7 @@ struct thread_info {
    #define _TIF_MCA_INIT (1 << TIF_MCA_INIT)
    #define _TIF_DB_DISABLED (1 << TIF_DB_DISABLED)
    #define _TIF_RESTORE_RSE (1 << TIF_RESTORE_RSE)
    +#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)

    /* "work to do on user-return" bits */
    #define TIF_ALLWORK_MASK (_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SYSCALL_AUDIT|\
    @@ -125,7 +127,6 @@ struct thread_info {
    /* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT */
    #define TIF_WORK_MASK (TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT))

    -#define TS_POLLING 1 /* true if in idle loop and not sleeping */
    #define TS_RESTORE_SIGMASK 2 /* restore signal mask in do_signal() */

    #ifndef __ASSEMBLY__



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