Messages in this thread | | | Date | Wed, 18 Nov 2015 11:45:26 -0700 | Subject | Linux 4.3 kallsyms_lookup_name not returning per_cpu symbol values | From | Jeffrey Merkey <> |
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kallsyms_lookup_name is not returning per_cpu symbols when called. The symbols show up when you run something with the kallsyms_iter struct but not through the regular interface. I have looked through the code and I am not able to determine with certainty if its designed this way or just busted. Any help with this would be appreciated.
The following code does display the per_cpu symbols, they just don't seem to show up when called from kallsyms_lookup_name.
struct kallsym_iter mdb_iter; int mdb_kallsyms(char *str, int (*print)(char *s, ...)) { register loff_t pos = 0; register struct kallsym_iter *iter = &mdb_iter;
if (!print) return 0;
// set to beginning of the kallsyms list reset_iter(iter, 0); while (1) { // search the kallsyms list if (!update_iter(iter, pos++)) break;
if (!iter->name[0]) continue;
// if an exclusion search was specified, skip non-matching entries if (str && *str && !strstr(iter->name, str)) continue;
if (iter->module_name[0]) { if (print("%0*lx %c %s [%s]\n", (int)(2*sizeof(void*)), iter->value, iter->type, iter->name, iter->module_name)) return 1; } else { if (print("%0*lx %c %s\n", (int)(2*sizeof(void*)), iter->value, iter->type, iter->name)) return 1; } } return 0; } EXPORT_SYMBOL_GPL(mdb_kallsyms);
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