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    Subjectx86 arch updates also broke s390
    <--  snip  -->

    CC arch/s390/kernel/asm-offsets.s
    In file included from
    /home/bunk/linux/kernel-2.6/git/linux-2.6/include/linux/sched.h: In function 'spin_needbreak':
    /home/bunk/linux/kernel-2.6/git/linux-2.6/include/linux/sched.h:1931: error: implicit declaration of function '__raw_spin_is_contended'
    make[2]: *** [arch/s390/kernel/asm-offsets.s] Error 1

    <-- snip -->

    Guilty commit:

    Commit: 95c354fe9f7d6decc08a92aa26eb233ecc2155bf
    Author: Nick Piggin <> Wed, 30 Jan 2008 13:31:20 +0100

    spinlock: lockbreak cleanup

    The break_lock data structure and code for spinlocks is quite nasty.
    Not only does it double the size of a spinlock but it changes locking to
    a potentially less optimal trylock.

    Put all of that under CONFIG_GENERIC_LOCKBREAK, and introduce a
    __raw_spin_is_contended that uses the lock data itself to determine whether
    there are waiters on the lock, to be used if CONFIG_GENERIC_LOCKBREAK is
    not set.

    Rename need_lockbreak to spin_needbreak, make it use spin_is_contended to
    decouple it from the spinlock implementation, and make it typesafe (rwlocks
    do not have any need_lockbreak sites -- why do they even get bloated up
    with that break_lock then?).

    Signed-off-by: Nick Piggin <>
    Signed-off-by: Ingo Molnar <>
    Signed-off-by: Thomas Gleixner <>



    "Is there not promise of rain?" Ling Tan asked suddenly out
    of the darkness. There had been need of rain for many days.
    "Only a promise," Lao Er said.
    Pearl S. Buck - Dragon Seed

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