Commit 403ed278 authored by Alessio Igor Bogani's avatar Alessio Igor Bogani Committed by Rusty Russell

module: Use the binary search for symbols resolution

Takes advantage of the order and locates symbols using binary search.

This work was supported by a hardware donation from the CE Linux Forum.
Signed-off-by: default avatarAlessio Igor Bogani <>
Signed-off-by: default avatarRusty Russell <>
Tested-by: default avatarDirk Behme <>
parent 1a94dc35
......@@ -57,6 +57,7 @@
#include <linux/kmemleak.h>
#include <linux/jump_label.h>
#include <linux/pfn.h>
#include <linux/bsearch.h>
#include <trace/events/module.h>
......@@ -363,17 +364,27 @@ static bool check_symbol(const struct symsearch *syms,
return true;
static int cmp_name(const void *va, const void *vb)
const char *a;
const struct kernel_symbol *b;
a = va; b = vb;
return strcmp(a, b->name);
static bool find_symbol_in_section(const struct symsearch *syms,
struct module *owner,
void *data)
struct find_symbol_arg *fsa = data;
unsigned int i;
struct kernel_symbol *sym;
sym = bsearch(fsa->name, syms->start, syms->stop - syms->start,
sizeof(struct kernel_symbol), cmp_name);
if (sym != NULL && check_symbol(syms, owner, sym - syms->start, data))
return true;
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;
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