linux-kernel - Linux 4.3 kallsyms_lookup_name not returning per

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Message-ID: <CA+ekxPUyWS_WaZ5Hue-abo7FG_vPVt9AQJhUJSPn_Q93tRN1TQ@mail.gmail.com>
Date:	Wed, 18 Nov 2015 11:45:26 -0700
From:	Jeffrey Merkey <jeffmerkey@...il.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Linux 4.3 kallsyms_lookup_name not returning per_cpu symbol values

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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