Gautham R Shenoy wrote: > With CONFIG_PREEMPT=y on 2.6.23-rc8-mm2, rcu_random() calls > smp_processor_id() from a preemptible context, triggering the > following kernel error. > > BUG: using smp_processor_id() in preemptible [00000001] code: > rcu_torture_fak/5155 > caller is rcu_random+0x16/0x39 [rcutorture] > [<c010612f>] dump_trace+0x68/0x1d2 > [<c01062b1>] show_trace_log_lvl+0x18/0x2c > [<c0106c23>] show_trace+0xf/0x11 > [<c0106d33>] dump_stack+0x12/0x14 > [<c02a0a25>] debug_smp_processor_id+0xa1/0xb4 > [<f887064c>] rcu_random+0x16/0x39 [rcutorture] > [<f8870cdf>] <3>BUG: using smp_processor_id() in preemptible [00000001] > code: rcu_torture_fak/5156 > rcu_torture_fakewriter+0x4d/0xc5 [rcutorture] > [<c0139b32>] caller is rcu_random+0x16/0x39 [rcutorture] > kthread+0x38/0x5e > [<c0105ca7>] kernel_thread_helper+0x7/0x10 > ======================= > [<c010612f>] dump_trace+0x68/0x1d2 > [<c01062b1>] show_trace_log_lvl+0x18/0x2c > [<c0106c23>] show_trace+0xf/0x11 > [<c0106d33>] dump_stack+0x12/0x14 > [<c02a0a25>] debug_smp_processor_id+0xa1/0xb4 > [<f887064c>] rcu_random+0x16/0x39 [rcutorture] > [<f8870cdf>] rcu_torture_fakewriter+0x4d/0xc5 [rcutorture] > > rcu_random() can do with raw_smp_processor_id() as a parameter to cpu_clock() > in this particular context. > > Signed-off-by: Gautham R Shenoy <[EMAIL PROTECTED]>
Looks reasonable to me. Acked-by: Josh Triplett <[EMAIL PROTECTED]> - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
