ia64/linux-2.6.18-xen.hg

view lib/extable.c @ 847:ad4d307bf9ce

net sfc: Update sfc and sfc_resource driver to latest release

...and update sfc_netfront, sfc_netback, sfc_netutil for any API changes

sfc_netback: Fix asymmetric use of SFC buffer table alloc and free
sfc_netback: Clean up if no SFC accel device found
sfc_netback: Gracefully handle case where page grant fails
sfc_netback: Disable net acceleration if the physical link goes down
sfc_netfront: Less verbose error messages, more verbose counters for
rx discard errors
sfc_netfront: Gracefully handle case where SFC netfront fails during
initialisation

Signed-off-by: Kieran Mansley <kmansley@solarflare.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue Mar 31 11:59:10 2009 +0100 (2009-03-31)
parents 831230e53067
children
line source
1 /*
2 * Derived from arch/ppc/mm/extable.c and arch/i386/mm/extable.c.
3 *
4 * Copyright (C) 2004 Paul Mackerras, IBM Corp.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/sort.h>
15 #include <asm/uaccess.h>
17 #ifndef ARCH_HAS_SORT_EXTABLE
18 /*
19 * The exception table needs to be sorted so that the binary
20 * search that we use to find entries in it works properly.
21 * This is used both for the kernel exception table and for
22 * the exception tables of modules that get loaded.
23 */
24 static int cmp_ex(const void *a, const void *b)
25 {
26 const struct exception_table_entry *x = a, *y = b;
28 /* avoid overflow */
29 if (x->insn > y->insn)
30 return 1;
31 if (x->insn < y->insn)
32 return -1;
33 return 0;
34 }
36 void sort_extable(struct exception_table_entry *start,
37 struct exception_table_entry *finish)
38 {
39 sort(start, finish - start, sizeof(struct exception_table_entry),
40 cmp_ex, NULL);
41 }
42 #endif
44 #ifndef ARCH_HAS_SEARCH_EXTABLE
45 /*
46 * Search one exception table for an entry corresponding to the
47 * given instruction address, and return the address of the entry,
48 * or NULL if none is found.
49 * We use a binary search, and thus we assume that the table is
50 * already sorted.
51 */
52 const struct exception_table_entry *
53 search_extable(const struct exception_table_entry *first,
54 const struct exception_table_entry *last,
55 unsigned long value)
56 {
57 while (first <= last) {
58 const struct exception_table_entry *mid;
60 mid = (last - first) / 2 + first;
61 /*
62 * careful, the distance between entries can be
63 * larger than 2GB:
64 */
65 if (mid->insn < value)
66 first = mid + 1;
67 else if (mid->insn > value)
68 last = mid - 1;
69 else
70 return mid;
71 }
72 return NULL;
73 }
74 #endif