linux-kernel - [PATCH 1/2] liblockdep: Fix compile errors

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Date:	Thu,  9 Jun 2016 15:34:34 +0200
From:	Vishal Thanki <vishalthanki@...il.com>
To:	sasha.levin@...cle.com, linux-kernel@...r.kernel.org
Cc:	Vishal Thanki <vishalthanki@...il.com>
Subject: [PATCH 1/2] liblockdep: Fix compile errors

Following commit caused failures.

dfaaf3fa0: (Use __jhash_mix() for iterate_chain_key())
Fixed by adding jhash.h with minimal stuff required

75dd602a5: (lockdep: Fix lock_chain::base size)
Fixed by adding ARRAY_SIZE macro definition and
changing the MAX_LOCK_DEPTH value to similar defined
in linux/sched.h

Signed-off-by: Vishal Thanki <vishalthanki@...il.com>
---
 tools/lib/lockdep/lockdep.c                |  2 +-
 tools/lib/lockdep/uinclude/linux/jhash.h   | 20 ++++++++++++++++++++
 tools/lib/lockdep/uinclude/linux/kernel.h  |  1 +
 tools/lib/lockdep/uinclude/linux/lockdep.h |  2 +-
 4 files changed, 23 insertions(+), 2 deletions(-)
 create mode 100644 tools/lib/lockdep/uinclude/linux/jhash.h

diff --git a/tools/lib/lockdep/lockdep.c b/tools/lib/lockdep/lockdep.c
index a0a2e3a..1ba6f33 100644
--- a/tools/lib/lockdep/lockdep.c
+++ b/tools/lib/lockdep/lockdep.c
@@ -4,5 +4,5 @@
 #define hlist_for_each_entry_rcu	hlist_for_each_entry
 #define hlist_add_head_rcu		hlist_add_head
 #define hlist_del_rcu			hlist_del
-
+#define prandom_u32			rand
 #include "../../../kernel/locking/lockdep.c"
diff --git a/tools/lib/lockdep/uinclude/linux/jhash.h b/tools/lib/lockdep/uinclude/linux/jhash.h
new file mode 100644
index 0000000..5c40bd1
--- /dev/null
+++ b/tools/lib/lockdep/uinclude/linux/jhash.h
@@ -0,0 +1,20 @@
+#ifndef _LINUX_JHASH_H
+#define _LINUX_JHASH_H
+
+static inline __u32 rol32(__u32 word, unsigned int shift)
+{
+	return (word << shift) | (word >> ((-shift) & 31));
+}
+
+/* __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;	\
+}
+
+#endif /* _LINUX_JHASH_H */
diff --git a/tools/lib/lockdep/uinclude/linux/kernel.h b/tools/lib/lockdep/uinclude/linux/kernel.h
index 276c7a8..ab204c8 100644
--- a/tools/lib/lockdep/uinclude/linux/kernel.h
+++ b/tools/lib/lockdep/uinclude/linux/kernel.h
@@ -44,4 +44,5 @@
 #define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; })
 #endif
 
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
 #endif
diff --git a/tools/lib/lockdep/uinclude/linux/lockdep.h b/tools/lib/lockdep/uinclude/linux/lockdep.h
index c808c7d..8f6e725 100644
--- a/tools/lib/lockdep/uinclude/linux/lockdep.h
+++ b/tools/lib/lockdep/uinclude/linux/lockdep.h
@@ -8,7 +8,7 @@
 #include <linux/utsname.h>
 #include <linux/compiler.h>
 
-#define MAX_LOCK_DEPTH 2000UL
+#define MAX_LOCK_DEPTH 48UL
 
 #define asmlinkage
 #define __visible
-- 
2.4.11