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>
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1 changed files with 2 additions and 5 deletions
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@ -2055,11 +2055,8 @@ static const struct kernel_symbol *lookup_symbol(const char *name,
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const struct kernel_symbol *start,
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const struct kernel_symbol *stop)
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{
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const struct kernel_symbol *ks = start;
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for (; ks < stop; ks++)
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if (strcmp(ks->name, name) == 0)
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return ks;
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return NULL;
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return bsearch(name, start, stop - start,
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sizeof(struct kernel_symbol), cmp_name);
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}
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static int is_exported(const char *name, unsigned long value,
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