mtd: nand: omap: Fix comment in platform data using wrong Kconfig symbol
[linux/fpc-iii.git] / arch / x86 / kernel / livepatch.c
blobe9d252d873aa0d68484353d0621452348ffd98ed
1 /*
2 * livepatch.c - x86-specific Kernel Live Patching Core
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 #include <linux/module.h>
19 #include <linux/kallsyms.h>
20 #include <linux/livepatch.h>
21 #include <asm/text-patching.h>
23 /* Apply per-object alternatives. Based on x86 module_finalize() */
24 void arch_klp_init_object_loaded(struct klp_patch *patch,
25 struct klp_object *obj)
27 int cnt;
28 struct klp_modinfo *info;
29 Elf_Shdr *s, *alt = NULL, *para = NULL;
30 void *aseg, *pseg;
31 const char *objname;
32 char sec_objname[MODULE_NAME_LEN];
33 char secname[KSYM_NAME_LEN];
35 info = patch->mod->klp_info;
36 objname = obj->name ? obj->name : "vmlinux";
38 /* See livepatch core code for BUILD_BUG_ON() explanation */
39 BUILD_BUG_ON(MODULE_NAME_LEN < 56 || KSYM_NAME_LEN != 128);
41 for (s = info->sechdrs; s < info->sechdrs + info->hdr.e_shnum; s++) {
42 /* Apply per-object .klp.arch sections */
43 cnt = sscanf(info->secstrings + s->sh_name,
44 ".klp.arch.%55[^.].%127s",
45 sec_objname, secname);
46 if (cnt != 2)
47 continue;
48 if (strcmp(sec_objname, objname))
49 continue;
50 if (!strcmp(".altinstructions", secname))
51 alt = s;
52 if (!strcmp(".parainstructions", secname))
53 para = s;
56 if (alt) {
57 aseg = (void *) alt->sh_addr;
58 apply_alternatives(aseg, aseg + alt->sh_size);
61 if (para) {
62 pseg = (void *) para->sh_addr;
63 apply_paravirt(pseg, pseg + para->sh_size);