Revert "x86/UV: Add uvtrace support"

This reverts commit 8eba18428a.

uv_trace() is not used by anything, nor is uv_trace_nmi_func, nor
uv_trace_func.

That's not how we do instrumentation code in the kernel: we add
tracepoints, printk()s, etc. so that everyone not just those with
magic kernel modules can debug a system.

So remove this unused (and misguied) piece of code.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Mike Travis <travis@sgi.com>
Cc: Dimitri Sivanich <sivanich@sgi.com>
Cc: Hedi Berriche <hedi@sgi.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Jason Wessel <jason.wessel@windriver.com>
Link: http://lkml.kernel.org/n/tip-tumfBffmr4jmnt8Gyxanoblg@git.kernel.org

arch/x86/platform/uv/uv_nmi.c

@@ -1,5 +1,5 @@
 /*
- * SGI NMI/TRACE support routines
+ * SGI NMI support routines
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -39,13 +39,6 @@
 #include <asm/uv/uv_hub.h>
 #include <asm/uv/uv_mmrs.h>
 
-void (*uv_trace_func)(const char *f, const int l, const char *fmt, ...);
-EXPORT_SYMBOL(uv_trace_func);
-
-void (*uv_trace_nmi_func)(unsigned int reason, struct pt_regs *regs);
-EXPORT_SYMBOL(uv_trace_nmi_func);
-
-
 /*
  * UV handler for NMI
  *
@@ -599,10 +592,6 @@ int uv_handle_nmi(unsigned int reason, struct pt_regs *regs)
 		return NMI_DONE;
 	}
 
-	/* Call possible NMI trace function */
-	if (unlikely(uv_trace_nmi_func))
-		(uv_trace_nmi_func)(reason, regs);
-
 	/* Indicate we are the first CPU into the NMI handler */
 	master = (atomic_read(&uv_nmi_cpu) == cpu);