enhanced spinlock debugging for intel - take 2

Hi -

I've revised and improved the intel spinlock debugging I posted two weeks ago.

Attached is the diff (against 2.4.8). It moves the debugging routines into a seperate C file (this is how sparc does it), fixes the race condition noted by Tachino Nobuhiro, and adds debugging routines for read-write spinlocks.

It compiles and runs fine on my single processor machine, and continues to detect problems with the USB SCSI code. Anybody want to try it on an SMP box and make sure it's OK?

Make sure you do a "make dep" after applying the patch, since it exports symbols...

                                        -bwb

                                        Brent Baccala
                                        [email protected]

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diff -Nur linux-2.4.8-dist/arch/i386/lib/Makefile linux-2.4.8/arch/i386/lib/Makefile
@@ -7,9 +7,11 @@
 
 L_TARGET = lib.a
 
+export-objs = debuglocks.o
+
 obj-y = checksum.o old-checksum.o delay.o \
 	usercopy.o getuser.o \
-	memcpy.o strstr.o
+	memcpy.o strstr.o debuglocks.o
 
 obj-$(CONFIG_X86_USE_3DNOW) += mmx.o
 obj-$(CONFIG_HAVE_DEC_LOCK) += dec_and_lock.o

make mrproper; make dep is the only way to guarantee that module symbol versions are correct after a patch.