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authorJason Baron <jbaron@redhat.com>2010-09-17 11:09:17 -0400
committerSteven Rostedt <rostedt@goodmis.org>2010-09-22 16:31:19 -0400
commit52159d98be6f26c48f5e02c7ab3c9848a85979b5 (patch)
tree29ba759acd0a9fd82b796b9e965dab5ed9d30ce6 /scripts/basic
parent8f7b50c514206211cc282a4247f7b12f18dee674 (diff)
jump label: Convert dynamic debug to use jump labels
Convert the 'dynamic debug' infrastructure to use jump labels. Signed-off-by: Jason Baron <jbaron@redhat.com> LKML-Reference: <b77627358cea3e27d7be4386f45f66219afb8452.1284733808.git.jbaron@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'scripts/basic')
-rw-r--r--scripts/basic/Makefile2
-rw-r--r--scripts/basic/hash.c64
2 files changed, 1 insertions, 65 deletions
diff --git a/scripts/basic/Makefile b/scripts/basic/Makefile
index 09559951df12..4c324a1f1e0e 100644
--- a/scripts/basic/Makefile
+++ b/scripts/basic/Makefile
@@ -9,7 +9,7 @@
9# fixdep: Used to generate dependency information during build process 9# fixdep: Used to generate dependency information during build process
10# docproc: Used in Documentation/DocBook 10# docproc: Used in Documentation/DocBook
11 11
12hostprogs-y := fixdep docproc hash 12hostprogs-y := fixdep docproc
13always := $(hostprogs-y) 13always := $(hostprogs-y)
14 14
15# fixdep is needed to compile other host programs 15# fixdep is needed to compile other host programs
diff --git a/scripts/basic/hash.c b/scripts/basic/hash.c
deleted file mode 100644
index 2ef5d3f666b8..000000000000
--- a/scripts/basic/hash.c
+++ /dev/null
@@ -1,64 +0,0 @@
1/*
2 * Copyright (C) 2008 Red Hat, Inc., Jason Baron <jbaron@redhat.com>
3 *
4 */
5
6#include <stdio.h>
7#include <stdlib.h>
8#include <string.h>
9
10#define DYNAMIC_DEBUG_HASH_BITS 6
11
12static const char *program;
13
14static void usage(void)
15{
16 printf("Usage: %s <djb2|r5> <modname>\n", program);
17 exit(1);
18}
19
20/* djb2 hashing algorithm by Dan Bernstein. From:
21 * http://www.cse.yorku.ca/~oz/hash.html
22 */
23
24static unsigned int djb2_hash(char *str)
25{
26 unsigned long hash = 5381;
27 int c;
28
29 c = *str;
30 while (c) {
31 hash = ((hash << 5) + hash) + c;
32 c = *++str;
33 }
34 return (unsigned int)(hash & ((1 << DYNAMIC_DEBUG_HASH_BITS) - 1));
35}
36
37static unsigned int r5_hash(char *str)
38{
39 unsigned long hash = 0;
40 int c;
41
42 c = *str;
43 while (c) {
44 hash = (hash + (c << 4) + (c >> 4)) * 11;
45 c = *++str;
46 }
47 return (unsigned int)(hash & ((1 << DYNAMIC_DEBUG_HASH_BITS) - 1));
48}
49
50int main(int argc, char *argv[])
51{
52 program = argv[0];
53
54 if (argc != 3)
55 usage();
56 if (!strcmp(argv[1], "djb2"))
57 printf("%d\n", djb2_hash(argv[2]));
58 else if (!strcmp(argv[1], "r5"))
59 printf("%d\n", r5_hash(argv[2]));
60 else
61 usage();
62 exit(0);
63}
64