2.6.9-rc1-mm4 sparc reiser4 build broken - undefined atomic_sub_and_test

[Paul Jackson <pj@sgi.com>]

The default config for sparc on 2.6.9-rc1-mm4 doesn't build, using the
crosstools from http://developer.osdl.org/dev/plm/cross_compile.

Hans,

  Andrew counts on us to build for various arch's, especially when
  submitting something non-trivial.  The above crosstools work
  pretty good - give them a try.

The final link fails with:

  fs/built-in.o(.text+0x58618): In function `end_io_handler':
  : undefined reference to `atomic_sub_and_test'
  make[1]: *** [arch/sparc/boot/image] Error 1

The macro 'atomic_sub_and_test' is defined for more or less every other
arch, in various include/asm-*/atomic.h files, but not defined for
sparc.

This macro is used in:

	fs/reiser4/flush_queue.c:
               if (atomic_sub_and_test(bio->bi_vcnt, &fq->nr_submitted))

If I disable the config items:

  CONFIG_REISER4_FS=y
  CONFIG_REISER4_LARGE_KEY=y

then it builds ok (with the bogus #else removed from cachefs.h, as
already reported on lkml).

-- 
                          I won't rest till it's the best ...
                          Programmer, Linux Scalability
                          Paul Jackson <pj@sgi.com> 1.650.933.1373