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    Subject2.6.16-rc regression: m68k CONFIG_RMW_INSNS=n compile broken
    The m68k defconfig does no longer compile in 2.6.16-rc:

    <-- snip -->

    CC fs/file_table.o
    fs/file_table.c: In function `fget':
    fs/file_table.c:170: warning: implicit declaration of function `cmpxchg'
    LD .tmp_vmlinux1
    fs/built-in.o(.text+0x275a): In function `fget':
    : undefined reference to `cmpxchg'
    fs/built-in.o(.text+0x27da): In function `fget_light':
    : undefined reference to `cmpxchg'
    make: *** [.tmp_vmlinux1] Error 1

    <-- snip -->

    It seems the problem is that in the CONFIG_RMW_INSNS=n case, there's no
    cmpxchg #define in include/asm-m68k/system.h required for the
    atomic_add_unless #define in include/asm-m68k/atomic.h.



    "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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