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    Subject2.6.22-rc3-mm1: Xen compile error with X86_CMPXCHG=n
    I'm getting the following compile error in 2.6.22-rc3-mm1 with 
    CONFIG_X86_CMPXCHG=n (with -Werror-implicit-function-declaration -
    otherwise it would be a link error):

    <-- snip -->

    CC drivers/xen/grant-table.o
    /home/bunk/linux/kernel-2.6/linux-2.6.22-rc3-mm1/drivers/xen/grant-table.c: In function ‘gnttab_end_foreign_access_ref’:
    /home/bunk/linux/kernel-2.6/linux-2.6.22-rc3-mm1/drivers/xen/grant-table.c:203: error: implicit declaration of function ‘sync_cmpxchg’
    make[3]: *** [drivers/xen/grant-table.o] Error 1

    <-- snip -->

    Adding a dependency of XEN on X86_CMPXCHG should not be a problem and
    not prevent any reasonable real-life usage.

    But what worries me is that a seemingly architecture independent
    driver uses a function only available in some configurations.



    "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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