module: wrapper for symbol name.

commit 2e7bac536106236104e9e339531ff0fcdb7b8147 upstream.

This trivial wrapper adds clarity and makes the following patch
smaller.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/kernel/module.c b/kernel/module.c
index 38c7bd5583fff036c0f993ac2c15077882d61501..56d138cdaadb0697e1cc6c0b891287bff42b5cd8 100644 (file)
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -3646,6 +3646,11 @@ static inline int is_arm_mapping_symbol(const char *str)
               && (str[2] == '\0' || str[2] == '.');
 }
 
+static const char *symname(struct module *mod, unsigned int symnum)
+{
+       return mod->strtab + mod->symtab[symnum].st_name;
+}
+
 static const char *get_ksymbol(struct module *mod,
                               unsigned long addr,
                               unsigned long *size,
@@ -3668,15 +3673,15 @@ static const char *get_ksymbol(struct module *mod,
 
                /* We ignore unnamed symbols: they're uninformative
                 * and inserted at a whim. */
+               if (*symname(mod, i) == '\0'
+                   || is_arm_mapping_symbol(symname(mod, i)))
+                       continue;
+
                if (mod->symtab[i].st_value <= addr
-                   && mod->symtab[i].st_value > mod->symtab[best].st_value
-                   && *(mod->strtab + mod->symtab[i].st_name) != '\0'
-                   && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
+                   && mod->symtab[i].st_value > mod->symtab[best].st_value)
                        best = i;
                if (mod->symtab[i].st_value > addr
-                   && mod->symtab[i].st_value < nextval
-                   && *(mod->strtab + mod->symtab[i].st_name) != '\0'
-                   && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
+                   && mod->symtab[i].st_value < nextval)
                        nextval = mod->symtab[i].st_value;
        }
 
@@ -3687,7 +3692,7 @@ static const char *get_ksymbol(struct module *mod,
                *size = nextval - mod->symtab[best].st_value;
        if (offset)
                *offset = addr - mod->symtab[best].st_value;
-       return mod->strtab + mod->symtab[best].st_name;
+       return symname(mod, best);
 }
 
 /* For kallsyms to ask for address resolution.  NULL means not found.  Careful
@@ -3782,8 +3787,7 @@ int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
                if (symnum < mod->num_symtab) {
                        *value = mod->symtab[symnum].st_value;
                        *type = mod->symtab[symnum].st_info;
-                       strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
-                               KSYM_NAME_LEN);
+                       strlcpy(name, symname(mod, symnum), KSYM_NAME_LEN);
                        strlcpy(module_name, mod->name, MODULE_NAME_LEN);
                        *exported = is_exported(name, *value, mod);
                        preempt_enable();
@@ -3800,7 +3804,7 @@ static unsigned long mod_find_symname(struct module *mod, const char *name)
        unsigned int i;
 
        for (i = 0; i < mod->num_symtab; i++)
-               if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
+               if (strcmp(name, symname(mod, i)) == 0 &&
                    mod->symtab[i].st_info != 'U')
                        return mod->symtab[i].st_value;
        return 0;
@@ -3844,7 +3848,7 @@ int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
                if (mod->state == MODULE_STATE_UNFORMED)
                        continue;
                for (i = 0; i < mod->num_symtab; i++) {
-                       ret = fn(data, mod->strtab + mod->symtab[i].st_name,
+                       ret = fn(data, symname(mod, i),
                                 mod, mod->symtab[i].st_value);
                        if (ret != 0)
                                return ret;