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| author | Alessio Igor Bogani <abogani@kernel.org> | 2011-05-18 22:35:59 +0200 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2011-05-19 16:55:27 +0930 |
| commit | 9d63487f86115b1d3ef69670043bcf2b83c4d227 (patch) | |
| tree | 3833a5f467f0958eaeab9f86f207dca60868bb0d | |
| parent | 403ed27846aa126ecf0b842b5b179c506b9d989c (diff) | |
| download | linux-9d63487f86115b1d3ef69670043bcf2b83c4d227.tar.bz2 | |
module: Use binary search in lookup_symbol()
The function is_exported() with its helper function lookup_symbol() are used to
verify if a provided symbol is effectively exported by the kernel or by the
modules. Now that both have their symbols sorted we can replace a linear search
with a binary search which provide a considerably speed-up.
This work was supported by a hardware donation from the CE Linux Forum.
Signed-off-by: Alessio Igor Bogani <abogani@kernel.org>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| -rw-r--r-- | kernel/module.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/kernel/module.c b/kernel/module.c index d1db8eb56ad4..22879725678d 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -2055,11 +2055,8 @@ static const struct kernel_symbol *lookup_symbol(const char *name, const struct kernel_symbol *start, const struct kernel_symbol *stop) { - const struct kernel_symbol *ks = start; - for (; ks < stop; ks++) - if (strcmp(ks->name, name) == 0) - return ks; - return NULL; + return bsearch(name, start, stop - start, + sizeof(struct kernel_symbol), cmp_name); } static int is_exported(const char *name, unsigned long value, |