tools/lib/lockdep: Fix compilation for 4.11

 - More rcu stubs
 - New dummy headers due to sched header split
 - jhash2 included in due to kernel lockdep inclusion and usage

Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: a.p.zijlstra@chello.nl
Cc: ben@decadent.org.uk
Link: http://lkml.kernel.org/r/20170525130005.5947-13-alexander.levin@verizon.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

3 files changed, 231 insertions, 0 deletions

diff --git a/tools/include/linux/bitops.h b/tools/include/linux/bitops.h
index 1aecad369af5..969db1981868 100644
--- a/tools/include/linux/bitops.h
+++ b/tools/include/linux/bitops.h
@@ -61,4 +61,14 @@ static inline unsigned fls_long(unsigned long l)
         return fls64(l);
 }
 
+/**
+ * rol32 - rotate a 32-bit value left
+ * @word: value to rotate
+ * @shift: bits to roll
+ */
+static inline __u32 rol32(__u32 word, unsigned int shift)
+{
+        return (word << shift) | (word >> ((-shift) & 31));
+}
+
 #endif
diff --git a/tools/include/linux/jhash.h b/tools/include/linux/jhash.h
new file mode 100644
index 000000000000..348c6f47e4cc
--- /dev/null
+++ b/tools/include/linux/jhash.h
@@ -0,0 +1,175 @@
+#ifndef _LINUX_JHASH_H
+#define _LINUX_JHASH_H
+
+/* jhash.h: Jenkins hash support.
+ *
+ * Copyright (C) 2006. Bob Jenkins (bob_jenkins@burtleburtle.net)
+ *
+ * http://burtleburtle.net/bob/hash/
+ *
+ * These are the credits from Bob's sources:
+ *
+ * lookup3.c, by Bob Jenkins, May 2006, Public Domain.
+ *
+ * These are functions for producing 32-bit hashes for hash table lookup.
+ * hashword(), hashlittle(), hashlittle2(), hashbig(), mix(), and final()
+ * are externally useful functions.  Routines to test the hash are included
+ * if SELF_TEST is defined.  You can use this free for any purpose.  It's in
+ * the public domain.  It has no warranty.
+ *
+ * Copyright (C) 2009-2010 Jozsef Kadlecsik (kadlec@blackhole.kfki.hu)
+ *
+ * I've modified Bob's hash to be useful in the Linux kernel, and
+ * any bugs present are my fault.
+ * Jozsef
+ */
+#include <linux/bitops.h>
+#include <linux/unaligned/packed_struct.h>
+
+/* Best hash sizes are of power of two */
+#define jhash_size(n)   ((u32)1<<(n))
+/* Mask the hash value, i.e (value & jhash_mask(n)) instead of (value % n) */
+#define jhash_mask(n)   (jhash_size(n)-1)
+
+/* __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
+
+/* jhash - hash an arbitrary key
+ * @k: sequence of bytes as key
+ * @length: the length of the key
+ * @initval: the previous hash, or an arbitray value
+ *
+ * The generic version, hashes an arbitrary sequence of bytes.
+ * No alignment or length assumptions are made about the input key.
+ *
+ * Returns the hash value of the key. The result depends on endianness.
+ */
+static inline u32 jhash(const void *key, u32 length, u32 initval)
+{
+        u32 a, b, c;
+        const u8 *k = key;
+
+        /* Set up the internal state */
+        a = b = c = JHASH_INITVAL + length + initval;
+
+        /* All but the last block: affect some 32 bits of (a,b,c) */
+        while (length > 12) {
+                a += __get_unaligned_cpu32(k);
+                b += __get_unaligned_cpu32(k + 4);
+                c += __get_unaligned_cpu32(k + 8);
+                __jhash_mix(a, b, c);
+                length -= 12;
+                k += 12;
+        }
+        /* Last block: affect all 32 bits of (c) */
+        /* All the case statements fall through */
+        switch (length) {
+        case 12: c += (u32)k[11]<<24;
+        case 11: c += (u32)k[10]<<16;
+        case 10: c += (u32)k[9]<<8;
+        case 9:  c += k[8];
+        case 8:  b += (u32)k[7]<<24;
+        case 7:  b += (u32)k[6]<<16;
+        case 6:  b += (u32)k[5]<<8;
+        case 5:  b += k[4];
+        case 4:  a += (u32)k[3]<<24;
+        case 3:  a += (u32)k[2]<<16;
+        case 2:  a += (u32)k[1]<<8;
+        case 1:  a += k[0];
+                 __jhash_final(a, b, c);
+        case 0: /* Nothing left to add */
+                break;
+        }
+
+        return c;
+}
+
+/* jhash2 - hash an array of u32's
+ * @k: the key which must be an array of u32's
+ * @length: the number of u32's in the key
+ * @initval: the previous hash, or an arbitray value
+ *
+ * Returns the hash value of the key.
+ */
+static inline u32 jhash2(const u32 *k, u32 length, u32 initval)
+{
+        u32 a, b, c;
+
+        /* Set up the internal state */
+        a = b = c = JHASH_INITVAL + (length<<2) + initval;
+
+        /* Handle most of the key */
+        while (length > 3) {
+                a += k[0];
+                b += k[1];
+                c += k[2];
+                __jhash_mix(a, b, c);
+                length -= 3;
+                k += 3;
+        }
+
+        /* Handle the last 3 u32's: all the case statements fall through */
+        switch (length) {
+        case 3: c += k[2];
+        case 2: b += k[1];
+        case 1: a += k[0];
+                __jhash_final(a, b, c);
+        case 0: /* Nothing left to add */
+                break;
+        }
+
+        return c;
+}
+
+
+/* __jhash_nwords - hash exactly 3, 2 or 1 word(s) */
+static inline u32 __jhash_nwords(u32 a, u32 b, u32 c, u32 initval)
+{
+        a += initval;
+        b += initval;
+        c += initval;
+
+        __jhash_final(a, b, c);
+
+        return c;
+}
+
+static inline u32 jhash_3words(u32 a, u32 b, u32 c, u32 initval)
+{
+        return __jhash_nwords(a, b, c, initval + JHASH_INITVAL + (3 << 2));
+}
+
+static inline u32 jhash_2words(u32 a, u32 b, u32 initval)
+{
+        return __jhash_nwords(a, b, 0, initval + JHASH_INITVAL + (2 << 2));
+}
+
+static inline u32 jhash_1word(u32 a, u32 initval)
+{
+        return __jhash_nwords(a, 0, 0, initval + JHASH_INITVAL + (1 << 2));
+}
+
+#endif /* _LINUX_JHASH_H */
diff --git a/tools/include/linux/unaligned/packed_struct.h b/tools/include/linux/unaligned/packed_struct.h
new file mode 100644
index 000000000000..c0d817de4df2
--- /dev/null
+++ b/tools/include/linux/unaligned/packed_struct.h
@@ -0,0 +1,46 @@
+#ifndef _LINUX_UNALIGNED_PACKED_STRUCT_H
+#define _LINUX_UNALIGNED_PACKED_STRUCT_H
+
+#include <linux/kernel.h>
+
+struct __una_u16 { u16 x; } __packed;
+struct __una_u32 { u32 x; } __packed;
+struct __una_u64 { u64 x; } __packed;
+
+static inline u16 __get_unaligned_cpu16(const void *p)
+{
+        const struct __una_u16 *ptr = (const struct __una_u16 *)p;
+        return ptr->x;
+}
+
+static inline u32 __get_unaligned_cpu32(const void *p)
+{
+        const struct __una_u32 *ptr = (const struct __una_u32 *)p;
+        return ptr->x;
+}
+
+static inline u64 __get_unaligned_cpu64(const void *p)
+{
+        const struct __una_u64 *ptr = (const struct __una_u64 *)p;
+        return ptr->x;
+}
+
+static inline void __put_unaligned_cpu16(u16 val, void *p)
+{
+        struct __una_u16 *ptr = (struct __una_u16 *)p;
+        ptr->x = val;
+}
+
+static inline void __put_unaligned_cpu32(u32 val, void *p)
+{
+        struct __una_u32 *ptr = (struct __una_u32 *)p;
+        ptr->x = val;
+}
+
+static inline void __put_unaligned_cpu64(u64 val, void *p)
+{
+        struct __una_u64 *ptr = (struct __una_u64 *)p;
+        ptr->x = val;
+}
+
+#endif /* _LINUX_UNALIGNED_PACKED_STRUCT_H */