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Subject[PATCH] 2.5.4 PREEMPT on UP x86 breakage
In 2.5.4, CONFIG_PREEMPT breaks UP x86 kernels by triggering
the BUG in release_kernel_lock(), kernel/sched.c, line 664.
The patch below fixed it for me. It's a bit crude, but smp.h
doesn't export the #define if CONFIG_SMP is disabled.

/Mikael

--- linux-2.5.4/include/asm-i386/smplock.h.~1~ Mon Feb 11 12:21:46 2002
+++ linux-2.5.4/include/asm-i386/smplock.h Mon Feb 11 16:55:18 2002
@@ -15,7 +15,7 @@
#else
#ifdef CONFIG_PREEMPT
#define kernel_locked() preempt_get_count()
-#define global_irq_holder 0
+#define global_irq_holder 0xFF /* XXX: NO_PROC_ID */
#else
#define kernel_locked() 1
#endif
-
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