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module: Use the binary search for symbols resolution

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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>
This commit is contained in:
Alessio Igor Bogani 2011-04-20 11:10:52 +02:00 • committed by Rusty Russell
parent 1a94dc35bc
commit 403ed27846
1 changed files with 16 additions and 5 deletions
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21
kernel/module.c
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@ -57,6 +57,7 @@
#include <linux/kmemleak.h> #include <linux/kmemleak.h>
#include <linux/jump_label.h> #include <linux/jump_label.h>
#include <linux/pfn.h> #include <linux/pfn.h>
#include <linux/bsearch.h>
#define CREATE_TRACE_POINTS #define CREATE_TRACE_POINTS
#include <trace/events/module.h> #include <trace/events/module.h>
@ -363,17 +364,27 @@ static bool check_symbol(const struct symsearch *syms,
return true; 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, static bool find_symbol_in_section(const struct symsearch *syms,
struct module *owner, struct module *owner,
void *data) void *data)
{ {
struct find_symbol_arg *fsa = 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; return false;
} }