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Message-Id: <1364001923-10796-2-git-send-email-andi@firstfloor.org>
Date: Fri, 22 Mar 2013 18:24:55 -0700
From: Andi Kleen <andi@...stfloor.org>
To: linux-kernel@...r.kernel.org
Cc: torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
x86@...nel.org, Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 01/29] tsx: Add generic noop macros for RTM intrinsics
From: Andi Kleen <ak@...ux.intel.com>
Add generic noop macros (act like transaction aborted) for RTM.
The main use case is an occasional _xtest() added to generic
code, without needing ifdefs. On x86+RTM this will use
real TSX instructions.
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
include/linux/rtm.h | 15 +++++++++++++++
1 files changed, 15 insertions(+), 0 deletions(-)
create mode 100644 include/linux/rtm.h
diff --git a/include/linux/rtm.h b/include/linux/rtm.h
new file mode 100644
index 0000000..887b221
--- /dev/null
+++ b/include/linux/rtm.h
@@ -0,0 +1,15 @@
+#ifndef _LINUX_RTM
+#define _LINUX_RTM 1
+
+#ifdef CONFIG_RTM_LOCKS
+#include <asm/rtm.h>
+#else
+/* Make transactions appear as always abort */
+#define _XBEGIN_STARTED 0
+#define _xbegin() 1
+#define _xtest() 0
+#define _xend() do {} while (0)
+#define _xabort(x) do {} while (0)
+#endif
+
+#endif
--
1.7.7.6
--
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