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authorAlessio Igor Bogani <abogani@kernel.org>2011-04-20 11:10:52 +0200
committerRusty Russell <rusty@rustcorp.com.au>2011-05-19 16:55:27 +0930
commit403ed27846aa126ecf0b842b5b179c506b9d989c (patch)
treed47ce51b2548c80237e193b99ec159e8ef59470a
parent1a94dc35bc5c166d89913dc01a49d27a3c21a455 (diff)
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: Alessio Igor Bogani <abogani@kernel.org> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Tested-by: Dirk Behme <dirk.behme@googlemail.com>
-rw-r--r--kernel/module.c21
1 files changed, 16 insertions, 5 deletions
diff --git a/kernel/module.c b/kernel/module.c
index e8aa462301e7..d1db8eb56ad4 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -57,6 +57,7 @@
#include <linux/kmemleak.h>
#include <linux/jump_label.h>
#include <linux/pfn.h>
+#include <linux/bsearch.h>
#define CREATE_TRACE_POINTS
#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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