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module: each_symbol_section instead of each_symbol 

Instead of having a callback function for each symbol in the kernel,
have a callback for each array of symbols.

This eases the logic when we move to sorted symbols and binary search.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Alessio Igor Bogani <abogani@kernel.org>
This commit is contained in:
Rusty Russell 2011-04-19 21:49:58 +02:00
parent 01526ed083
commit de4d8d5346
2 changed files with 30 additions and 17 deletions
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5
include/linux/module.h
View File

@ -477,8 +477,9 @@ const struct kernel_symbol *find_symbol(const char *name,
bool warn);
/* Walk the exported symbol table */
bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner,
unsigned int symnum, void *data), void *data);
bool each_symbol_section(bool (*fn)(const struct symsearch *arr,
struct module *owner,
void *data), void *data);
/* Returns 0 and fills in value, defined and namebuf, or -ERANGE if
symnum out of range. */

42
kernel/module.c
View File

@ -240,23 +240,24 @@ static bool each_symbol_in_section(const struct symsearch *arr,
struct module *owner,
bool (*fn)(const struct symsearch *syms,
struct module *owner,
unsigned int symnum, void *data),
void *data),
void *data)
{
unsigned int i, j;
unsigned int j;
for (j = 0; j < arrsize; j++) {
for (i = 0; i < arr[j].stop - arr[j].start; i++)
if (fn(&arr[j], owner, i, data))
return true;
if (fn(&arr[j], owner, data))
return true;
}
return false;
}
/* Returns true as soon as fn returns true, otherwise false. */
bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner,
unsigned int symnum, void *data), void *data)
bool each_symbol_section(bool (*fn)(const struct symsearch *arr,
struct module *owner,
void *data),
void *data)
{
struct module *mod;
static const struct symsearch arr[] = {
@ -309,7 +310,7 @@ bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner,
}
return false;
}
EXPORT_SYMBOL_GPL(each_symbol);
EXPORT_SYMBOL_GPL(each_symbol_section);
struct find_symbol_arg {
/* Input */
@ -323,15 +324,12 @@ struct find_symbol_arg {
const struct kernel_symbol *sym;
};
static bool find_symbol_in_section(const struct symsearch *syms,
struct module *owner,
unsigned int symnum, void *data)
static bool check_symbol(const struct symsearch *syms,
struct module *owner,
unsigned int symnum, void *data)
{
struct find_symbol_arg *fsa = data;
if (strcmp(syms->start[symnum].name, fsa->name) != 0)
return false;
if (!fsa->gplok) {
if (syms->licence == GPL_ONLY)
return false;
@ -365,6 +363,20 @@ static bool find_symbol_in_section(const struct symsearch *syms,
return true;
}
static bool find_symbol_in_section(const struct symsearch *syms,
struct module *owner,
void *data)
{
struct find_symbol_arg *fsa = data;
unsigned int i;
for (i = 0; i < syms->stop - syms->start; i++) {
if (strcmp(syms->start[i].name, fsa->name) == 0)
return check_symbol(syms, owner, i, data);
}
return false;
}
/* Find a symbol and return it, along with, (optional) crc and
* (optional) module which owns it. Needs preempt disabled or module_mutex. */
const struct kernel_symbol *find_symbol(const char *name,
@ -379,7 +391,7 @@ const struct kernel_symbol *find_symbol(const char *name,
fsa.gplok = gplok;
fsa.warn = warn;
if (each_symbol(find_symbol_in_section, &fsa)) {
if (each_symbol_section(find_symbol_in_section, &fsa)) {
if (owner)
*owner = fsa.owner;
if (crc)