On 4/16/11, Alessio Igor Bogani <abogani@xxxxxxxxxx> wrote:
> 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@xxxxxxxxxx>
> ---
> kernel/module.c | 23 ++++++++++++++++-------
> 1 files changed, 16 insertions(+), 7 deletions(-)
>
> diff --git a/kernel/module.c b/kernel/module.c
> index b438b25..74a57c1 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>
> @@ -351,22 +352,30 @@ struct find_symbol_arg {
> const struct kernel_symbol *sym;
> };
>
> +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_symsearch(const struct symsearch *syms,
> struct module *owner,
> void *data)
> {
> struct find_symbol_arg *fsa = data;
> + struct kernel_symbol *sym;
> unsigned int symnum;
> - int result;
>
> - for (symnum = 0; symnum < syms->stop - syms->start; symnum++) {
> - result = strcmp(fsa->name, syms->start[symnum].name);
> - if (result == 0)
> - break;
> - }
> - if (symnum >= syms->stop - syms->start)
> + sym = bsearch(fsa->name, syms->start, syms->stop - syms->start,
> + sizeof(struct kernel_symbol), cmp_name);
> +
> + if (sym == NULL)
> return false;
>
> + symnum = sym - syms->start;
> +
> if (!fsa->gplok) {
> if (syms->licence == GPL_ONLY)
> return false;
> --
> 1.7.4.1
>
> --
It seems like a great work .
Thanks
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