From: Andrea Righi Date: Sat, 20 Sep 2008 10:58:40 +0000 (+0200) Subject: x86, oprofile: BUG: using smp_processor_id() in preemptible code X-Git-Tag: firefly_0821_release~17143^2~17 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=45f197ade73ba95681b9803680c75352fc0a1c0a;p=firefly-linux-kernel-4.4.55.git x86, oprofile: BUG: using smp_processor_id() in preemptible code Add __raw access before setting per cpu variable switch_index, to avoid the following BUG: [ 449.166827] BUG: using smp_processor_id() in preemptible [00000000] code: modprobe/6998 [ 449.166848] caller is op_nmi_init+0xf0/0x2b0 [oprofile] [ 449.166855] Pid: 6998, comm: modprobe Not tainted 2.6.27-rc5-mm1 #29 [ 449.166860] Call Trace: [ 449.166872] [] debug_smp_processor_id+0xd7/0xe0 [ 449.166887] [] op_nmi_init+0xf0/0x2b0 [oprofile] [ 449.166902] [] oprofile_init+0x0/0x60 [oprofile] [ 449.166915] [] oprofile_arch_init+0x9/0x30 [oprofile] [ 449.166928] [] oprofile_init+0x1e/0x60 [oprofile] [ 449.166937] [] _stext+0x3b/0x160 [ 449.166946] [] __mutex_unlock_slowpath+0xe5/0x190 [ 449.166955] [] trace_hardirqs_on_caller+0xca/0x140 [ 449.166965] [] sys_init_module+0xdc/0x210 [ 449.166972] [] system_call_fastpath+0x16/0x1b Signed-off-by: Andrea Righi Acked-by: Robert Richter Signed-off-by: Ingo Molnar --- diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c index fb4902bc6f14..4108d02c5292 100644 --- a/arch/x86/oprofile/nmi_int.c +++ b/arch/x86/oprofile/nmi_int.c @@ -551,7 +551,7 @@ int __init op_nmi_init(struct oprofile_operations *ops) } /* default values, can be overwritten by model */ - __get_cpu_var(switch_index) = 0; + __raw_get_cpu_var(switch_index) = 0; ops->create_files = nmi_create_files; ops->setup = nmi_setup; ops->shutdown = nmi_shutdown;