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module: Use binary search in lookup_symbol()

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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>
This commit is contained in:
Alessio Igor Bogani 2011-05-18 22:35:59 +02:00 • committed by Rusty Russell
parent 403ed27846
commit 9d63487f86
1 changed files with 2 additions and 5 deletions
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7
kernel/module.c
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@ -2055,11 +2055,8 @@ static const struct kernel_symbol *lookup_symbol(const char *name,
const struct kernel_symbol *start, const struct kernel_symbol *start,
const struct kernel_symbol *stop) const struct kernel_symbol *stop)
{ {
const struct kernel_symbol *ks = start; return bsearch(name, start, stop - start,
for (; ks < stop; ks++) sizeof(struct kernel_symbol), cmp_name);
if (strcmp(ks->name, name) == 0)
return ks;
return NULL;
} }
static int is_exported(const char *name, unsigned long value, static int is_exported(const char *name, unsigned long value,