[PATCH] ia64: minor perfmon fixes

- remove extra include of asm/perfmon.h
- fix a bug if PFM_LOAD_CONTEXT by which it would not return an
  error if the task already had a context attached.

arch/ia64/kernel/perfmon.c

@@ -4322,6 +4322,7 @@ pfm_context_load(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
 	ret = pfm_reserve_session(current, ctx->ctx_fl_system, the_cpu);
 	if (ret) goto error;
 
+	ret = -EBUSY;
 	/*
 	 * task is necessarily stopped at this point.
 	 *
@@ -4331,6 +4332,10 @@ pfm_context_load(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
 	 *
 	 * XXX: needs to be atomic
 	 */
+	DPRINT(("[%d] before cmpxchg() old_ctx=%p new_ctx=%p\n",
+		current->pid, 
+		thread->pfm_context, ctx));
+
 	old = ia64_cmpxchg("acq", &thread->pfm_context, NULL, ctx, sizeof(pfm_context_t *));
 	if (old != NULL) {
 		DPRINT(("load_pid [%d] already has a context\n", req->load_pid));

arch/ia64/kernel/process.c

@@ -25,7 +25,6 @@
 
 #include <asm/delay.h>
 #include <asm/elf.h>
-#include <asm/perfmon.h>
 #include <asm/pgalloc.h>
 #include <asm/processor.h>
 #include <asm/sal.h>