Hi, currently I'm trying to get some statistics about a Freescale i.MX25 CPU frequency scaling driver. But when I'm loading the 'cpufreq_stats' driver no '/sys/devices/system/cpu/cpu0/cpufreq/stats' directory occurs. Instead when I try to unload the driver I get: $ rmmod cpufreq_stats WARNING: at fs/sysfs/group.c:138 sysfs_remove_group+0x54/0x114() sysfs group bf000810 not found for kobject 'cpufreq' Modules linked in: cpufreq_stats(-) Backtrace: [<c0029dbc>] (dump_backtrace+0x0/0x10c) from [<c02ab8cc>] (dump_stack+0x18/0x1c) r7:c39e1ed8 r6:c00e7828 r5:c0332243 r4:0000008a [<c02ab8b4>] (dump_stack+0x0/0x1c) from [<c003e2d4>] (warn_slowpath_common+0x50/0x80) [<c003e284>] (warn_slowpath_common+0x0/0x80) from [<c003e350>] (warn_slowpath_fmt+0x30/0x38) r7:00000880 r6:bf000810 r5:c38a3390 r4:00000000 [<c003e320>] (warn_slowpath_fmt+0x0/0x38) from [<c00e7828>] (sysfs_remove_group+0x54/0x114) r3:bf000810 r2:c0332254 [<c00e77d4>] (sysfs_remove_group+0x0/0x114) from [<bf00069c>] (cpufreq_stats_exit+0x54/0x9c [cpufreq_stats]) r7:00000880 r6:c39e1f3c r5:c38a3340 r4:00000000 [<bf000648>] (cpufreq_stats_exit+0x0/0x9c [cpufreq_stats]) from [<c006c6fc>] (sys_delete_module+0x1e0/0x25c) r5:bf00086c r4:00000000 [<c006c51c>] (sys_delete_module+0x0/0x25c) from [<c0025fa0>] (ret_fast_syscall+0x0/0x28) r7:00000081 r6:00000000 r5:00000880 r4:be898c78 ---[ end trace 1f4382bf2ce1570f ]--- I tried a bit with the module: When I load the 'cpufreq_stats' module its cpufreq_stat_notifier_policy() is called three times: Two times with 'val != CPUFREQ_NOTIFY', and the third call the routine terminates due to the call to 'cpufreq_frequency_get_table()' returns NULL. So, the sysfs directory entries are never created, but the module still tries to remove them when unloading. jbe -- To unsubscribe from this list: send the line "unsubscribe cpufreq" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
