Hi,Dave
On 12/01/2015 07:23 PM, Dr. David Alan Gilbert wrote:
* Zhang Chen (zhangchen.f...@cn.fujitsu.com) wrote:
From: zhangchen <zhangchen.f...@cn.fujitsu.com>
This used by colo-proxy to save and lookup
connection info
Signed-off-by: zhangchen <zhangchen.f...@cn.fujitsu.com>
---
include/qemu/jhash.h | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 52 insertions(+)
create mode 100644 include/qemu/jhash.h
diff --git a/include/qemu/jhash.h b/include/qemu/jhash.h
new file mode 100644
index 0000000..f6cc7b3
--- /dev/null
+++ b/include/qemu/jhash.h
@@ -0,0 +1,52 @@
+/*
+ * COarse-grain LOck-stepping Virtual Machines for Non-stop Service (COLO)
+ * (a.k.a. Fault Tolerance or Continuous Replication)
+ *
+ * Copyright (c) 2015 HUAWEI TECHNOLOGIES CO., LTD.
+ * Copyright (c) 2015 FUJITSU LIMITED
+ * Copyright (c) 2015 Intel Corporation
+ *
+ * Author: Zhang Chen <zhangchen.f...@cn.fujitsu.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * later. See the COPYING file in the top-level directory.
+ */
Please be careful with the copyright.
This code is mostly a copy of the kernel code, so I think it should take the
copyright
from the kernel code (see kernel's include/linux/jhash.h); and that copyright
states it's based on Bob Jenkins' Public Domain code.
Normally we have a problem as well QEMU doesn't like taking GPL2 code from the
kernel,
but my reading of the kernel's header file is that it's still Public domain;
but I don't
know what the right thing is to be sure.
Dave
I will remove it and change it to kernel jhash.h's copyright in next version
Thanks for review
zhangchen
+
+#ifndef QEMU_JHASH_H__
+#define QEMU_JHASH_H__
+
+/*
+ * hashtable relation copy from linux kernel jhash
+ */
+static inline uint32_t rol32(uint32_t word, unsigned int shift)
+{
+ return (word << shift) | (word >> (32 - shift));
+}
+
+/* __jhash_mix -- mix 3 32-bit values reversibly. */
+#define __jhash_mix(a, b, c) \
+{ \
+ a -= c; a ^= rol32(c, 4); c += b; \
+ b -= a; b ^= rol32(a, 6); a += c; \
+ c -= b; c ^= rol32(b, 8); b += a; \
+ a -= c; a ^= rol32(c, 16); c += b; \
+ b -= a; b ^= rol32(a, 19); a += c; \
+ c -= b; c ^= rol32(b, 4); b += a; \
+}
+
+/* __jhash_final - final mixing of 3 32-bit values (a,b,c) into c */
+#define __jhash_final(a, b, c) \
+{ \
+ c ^= b; c -= rol32(b, 14); \
+ a ^= c; a -= rol32(c, 11); \
+ b ^= a; b -= rol32(a, 25); \
+ c ^= b; c -= rol32(b, 16); \
+ a ^= c; a -= rol32(c, 4); \
+ b ^= a; b -= rol32(a, 14); \
+ c ^= b; c -= rol32(b, 24); \
+}
+
+/* An arbitrary initial parameter */
+#define JHASH_INITVAL 0xdeadbeef
+
+#endif /* QEMU_JHASH_H__ */
--
1.9.1
--
Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK
.
