parisc: perf: wire up sys_perf_counter_open

Signed-off-by: Kyle McMartin <[e-mail]>

arch/parisc/Kconfig

···
 	select RTC_DRV_GENERIC
 	select INIT_ALL_POSSIBLE
 	select BUG
+	select HAVE_PERF_COUNTERS
 	help
 	  The PA-RISC microprocessor is designed by Hewlett-Packard and used
 	  in many of their workstations & servers (HP9000 700 and 800 series,

arch/parisc/include/asm/perf_counter.h

···
+#ifndef __ASM_PARISC_PERF_COUNTER_H
+#define __ASM_PARISC_PERF_COUNTER_H
+
+/* parisc only supports software counters through this interface. */
+static inline void set_perf_counter_pending(void) { }
+
+#endif /* __ASM_PARISC_PERF_COUNTER_H */

arch/parisc/kernel/syscall_table.S

···
 	ENTRY_COMP(preadv)		/* 315 */
 	ENTRY_COMP(pwritev)
 	ENTRY_COMP(rt_tgsigqueueinfo)
-	ENTRY_SAME(ni_syscall)
+	ENTRY_SAME(perf_counter_open)
 
 	/* Nothing yet */
 

tools/perf/perf.h

···
 #define cpu_relax()	asm volatile("" ::: "memory");
 #endif
 
+#ifdef __hppa__
+#include "../../arch/parisc/include/asm/unistd.h"
+#define rmb()		asm volatile("" ::: "memory")
+#define cpu_relax()	asm volatile("" ::: "memory");
+#endif
+
 #include <time.h>
 #include <unistd.h>
 #include <sys/types.h>