Patch(?): linux-2.4.9/include/linux/spinlock.h sometimes needs to redefine atomic_dec_and_lock

[Adam J. Richter]

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	The following patch to linux-2.4.9/include/linux/spinlock.h
defines atomic_dec_and_lock to atomic_dec_and_test on SMP
architectures that do not have an "atomic_dec_and_lock", such as
i386.  I am not sure if this is the correct patch because, as I
mentioned in my previous email to this list a few minutes ago,
I'm not completely clear on the semantics of these two functions
and I think the problems with this routine may be the result of
an incompletely applied patch.  However, I am posting this patch
in case it is correct or otherwise helpful.  This patch does eliminate
the problem of atomic_dec_and_lock not being defined in sunrpc.o.

-- 
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--- linux-2.4.9/include/linux/spinlock.h	Wed Aug 15 14:21:11 2001
+++ linux/include/linux/spinlock.h	Thu Aug 16 18:29:09 2001
@@ -34,6 +34,11 @@
 #ifdef CONFIG_SMP
 #include <asm/spinlock.h>
 
+# ifndef CONFIG_HAVE_DEC_LOCK
+#  define atomic_dec_and_lock(atomic,lock) atomic_dec_and_test(atomic)
+# endif
+
+
 #elif !defined(spin_lock_init) /* !SMP and spin_lock_init not previously
                                   defined (e.g. by including asm/spinlock.h */
 

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