From: Michael Cree <mcree@orcon.net.nz>
Date: Tue, 8 Dec 2009 19:27:01 +0000 (-0500)
Subject: alpha: Add minimal support for software performance events
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a582e6f01b90211933e70edcec9bc0bbb1157402;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

alpha: Add minimal support for software performance events

In the kernel the patch enables configuration of the perf event
option, adds the perf_event_open syscall, and includes a minimal
architecture specific asm/perf_event.h header file.

Signed-off-by: Michael Cree <mcree@orcon.net.nz>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Matt Turner <mattst88@gmail.com>
---

diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index 443448154f3..bd7261ea8f9 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -9,6 +9,7 @@ config ALPHA
 	select HAVE_IDE
 	select HAVE_OPROFILE
 	select HAVE_SYSCALL_WRAPPERS
+	select HAVE_PERF_EVENTS
 	help
 	  The Alpha is a 64-bit general-purpose processor designed and
 	  marketed by the Digital Equipment Corporation of blessed memory,
diff --git a/arch/alpha/include/asm/perf_event.h b/arch/alpha/include/asm/perf_event.h
new file mode 100644
index 00000000000..3bef8522017
--- /dev/null
+++ b/arch/alpha/include/asm/perf_event.h
@@ -0,0 +1,9 @@
+#ifndef __ASM_ALPHA_PERF_EVENT_H
+#define __ASM_ALPHA_PERF_EVENT_H
+
+/* Alpha only supports software events through this interface. */
+static inline void set_perf_event_pending(void) { }
+
+#define PERF_EVENT_INDEX_OFFSET 0
+
+#endif /* __ASM_ALPHA_PERF_EVENT_H */
diff --git a/arch/alpha/include/asm/unistd.h b/arch/alpha/include/asm/unistd.h
index 62e823e68f6..804e5311c84 100644
--- a/arch/alpha/include/asm/unistd.h
+++ b/arch/alpha/include/asm/unistd.h
@@ -448,10 +448,11 @@
 #define __NR_preadv			490
 #define __NR_pwritev			491
 #define __NR_rt_tgsigqueueinfo		492
+#define __NR_perf_event_open		493
 
 #ifdef __KERNEL__
 
-#define NR_SYSCALLS			493
+#define NR_SYSCALLS			494
 
 #define __ARCH_WANT_IPC_PARSE_VERSION
 #define __ARCH_WANT_OLD_READDIR
diff --git a/arch/alpha/kernel/systbls.S b/arch/alpha/kernel/systbls.S
index d0bc3c8c3ed..09acb786e72 100644
--- a/arch/alpha/kernel/systbls.S
+++ b/arch/alpha/kernel/systbls.S
@@ -511,6 +511,7 @@ sys_call_table:
 	.quad sys_preadv				/* 490 */
 	.quad sys_pwritev
 	.quad sys_rt_tgsigqueueinfo
+	.quad sys_perf_event_open
 
 	.size sys_call_table, . - sys_call_table
 	.type sys_call_table, @object