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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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