[CPUFREQ] Fix BUG: using smp_processor_id() in preemptible code
authorAndrea Righi <righi.andrea@gmail.com>
Thu, 18 Sep 2008 10:43:40 +0000 (10:43 +0000)
committerDave Jones <davej@redhat.com>
Thu, 9 Oct 2008 17:52:44 +0000 (13:52 -0400)
commit4f6e6b9f97b0ce98a8d1da65adbaf743bd0486a9
treeb50dcdfa6ee6249af1be8549acbe459a452deb55
parentc4d14bc0bb5d13e316890651ae4518b764c3344c
[CPUFREQ] Fix BUG: using smp_processor_id() in preemptible code

Use get_cpu()/put_cpu() in cpufreq_ondemand init routine, instead of
smp_processor_id() to avoid the following BUG:

[   35.313118] BUG: using smp_processor_id() in preemptible [00000000] code=: modprobe/4952
[   35.313132] caller is cpufreq_gov_dbs_init+0xa/0x8f [cpufreq_ondemand]
[   35.313140] Pid: 4952, comm: modprobe Not tainted 2.6.27-rc5-mm1 #23
[   35.313145] Call Trace:
[   35.313158]  [<ffffffff80361ff7>] debug_smp_processor_id+0xd7/0xe0
[   35.313167]  [<ffffffffa010800a>] cpufreq_gov_dbs_init+0xa/0x8f [cpufreq_ondemand]
[   35.313176]  [<ffffffff8020903b>] _stext+0x3b/0x160
[   35.313185]  [<ffffffff804768c5>] __mutex_unlock_slowpath+0xe5/0x190
[   35.313195]  [<ffffffff8026236a>] trace_hardirqs_on_caller+0xca/0x140
[   35.313205]  [<ffffffff8026ef4c>] sys_init_module+0xdc/0x210
[   35.313212]  [<ffffffff8020b7cb>] system_call_fastpath+0x16/0x1b

Signed-off-by: Andrea Righi <righi.andrea@gmail.com>
Signed-off-by: Dave Jones <davej@redhat.com>
drivers/cpufreq/cpufreq_ondemand.c