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livepatch: Use kallsyms_on_each_match_symbol() to improve performance
Based on the test results of kallsyms_on_each_match_symbol() and kallsyms_on_each_symbol(), the average performance can be improved by more than 1500 times. Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
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@ -153,6 +153,24 @@ static int klp_find_callback(void *data, const char *name,
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return 0;
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}
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static int klp_match_callback(void *data, unsigned long addr)
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{
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struct klp_find_arg *args = data;
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args->addr = addr;
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args->count++;
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/*
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* Finish the search when the symbol is found for the desired position
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* or the position is not defined for a non-unique symbol.
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*/
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if ((args->pos && (args->count == args->pos)) ||
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(!args->pos && (args->count > 1)))
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return 1;
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return 0;
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}
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static int klp_find_object_symbol(const char *objname, const char *name,
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unsigned long sympos, unsigned long *addr)
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{
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@ -167,7 +185,7 @@ static int klp_find_object_symbol(const char *objname, const char *name,
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if (objname)
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module_kallsyms_on_each_symbol(klp_find_callback, &args);
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else
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kallsyms_on_each_symbol(klp_find_callback, &args);
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kallsyms_on_each_match_symbol(klp_match_callback, name, &args);
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/*
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* Ensure an address was found. If sympos is 0, ensure symbol is unique;
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