Merge git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86

[linux-2.6] / kernel / module.c

diff --git a/kernel/module.c b/kernel/module.c
index 7734595bd3296923947432521095020096f69fdf..91fe6958b6e1b253f98c2ab08518693df00a1497 100644 (file)
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -81,7 +81,8 @@ int unregister_module_notifier(struct notifier_block * nb)
 }
 EXPORT_SYMBOL(unregister_module_notifier);
 
-/* We require a truly strong try_module_get() */
+/* We require a truly strong try_module_get(): 0 means failure due to
+   ongoing or failed initialization etc. */
 static inline int strong_try_module_get(struct module *mod)
 {
        if (mod && mod->state == MODULE_STATE_COMING)
@@ -952,7 +953,8 @@ static unsigned long resolve_symbol(Elf_Shdr *sechdrs,
        ret = __find_symbol(name, &owner, &crc,
                        !(mod->taints & TAINT_PROPRIETARY_MODULE));
        if (ret) {
-               /* use_module can fail due to OOM, or module unloading */
+               /* use_module can fail due to OOM,
+                  or module initialization or unloading */
                if (!check_version(sechdrs, versindex, name, mod, crc) ||
                    !use_module(mod, owner))
                        ret = 0;
@@ -1369,7 +1371,7 @@ dup:
        return ret;
 }
 
-/* Change all symbols so that sh_value encodes the pointer directly. */
+/* Change all symbols so that st_value encodes the pointer directly. */
 static int simplify_symbols(Elf_Shdr *sechdrs,
                            unsigned int symindex,
                            const char *strtab,
@@ -1673,6 +1675,8 @@ static struct module *load_module(void __user *umod,
        unsigned int unusedcrcindex;
        unsigned int unusedgplindex;
        unsigned int unusedgplcrcindex;
+       unsigned int markersindex;
+       unsigned int markersstringsindex;
        struct module *mod;
        long err = 0;
        void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
@@ -1939,6 +1943,9 @@ static struct module *load_module(void __user *umod,
                add_taint_module(mod, TAINT_FORCED_MODULE);
        }
 #endif
+       markersindex = find_sec(hdr, sechdrs, secstrings, "__markers");
+       markersstringsindex = find_sec(hdr, sechdrs, secstrings,
+                                       "__markers_strings");
 
        /* Now do relocations. */
        for (i = 1; i < hdr->e_shnum; i++) {
@@ -1961,6 +1968,11 @@ static struct module *load_module(void __user *umod,
                if (err < 0)
                        goto cleanup;
        }
+#ifdef CONFIG_MARKERS
+       mod->markers = (void *)sechdrs[markersindex].sh_addr;
+       mod->num_markers =
+               sechdrs[markersindex].sh_size / sizeof(*mod->markers);
+#endif
 
         /* Find duplicate symbols */
        err = verify_export_symbols(mod);
@@ -1979,6 +1991,11 @@ static struct module *load_module(void __user *umod,
 
        add_kallsyms(mod, sechdrs, symindex, strindex, secstrings);
 
+#ifdef CONFIG_MARKERS
+       if (!mod->taints)
+               marker_update_probe_range(mod->markers,
+                       mod->markers + mod->num_markers, NULL, NULL);
+#endif
        err = module_finalize(hdr, sechdrs, mod);
        if (err < 0)
                goto cleanup;
@@ -2570,3 +2587,18 @@ EXPORT_SYMBOL(module_remove_driver);
 void struct_module(struct module *mod) { return; }
 EXPORT_SYMBOL(struct_module);
 #endif
+
+#ifdef CONFIG_MARKERS
+void module_update_markers(struct module *probe_module, int *refcount)
+{
+       struct module *mod;
+
+       mutex_lock(&module_mutex);
+       list_for_each_entry(mod, &modules, list)
+               if (!mod->taints)
+                       marker_update_probe_range(mod->markers,
+                               mod->markers + mod->num_markers,
+                               probe_module, refcount);
+       mutex_unlock(&module_mutex);
+}
+#endif