linux-kernel - x86 arch updates also broke s390

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Date:	Thu, 31 Jan 2008 02:33:10 +0200
From:	Adrian Bunk <bunk@...sta.de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Nick Piggin <npiggin@...e.de>,
	schwidefsky@...ibm.com, heiko.carstens@...ibm.com,
	linux390@...ibm.com
Subject: x86 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/arch/s390/kernel/asm-offsets.c:7:
/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 <npiggin@...e.de> 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 <npiggin@...e.de>
    Signed-off-by: Ingo Molnar <mingo@...e.hu>
    Signed-off-by: Thomas Gleixner <tglx@...utronix.de>




cu
Adrian

-- 

       "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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