* Jörn Engel <joern@xxxxxxxxx> wrote: > > ah. You should mark pit_read() function as notrace. PIT clocksource > > is rare. (add the 'notrace' word to the function prototype) > > Hardly a change at all. Apart from some offsets, this dump is > identical. > > stopped custom tracer. > BUG: spinlock recursion on CPU#0, sh/954 > lock: c030f280, .magic: dead4ead, .owner: sh/954, .owner_cpu: 0 > Pid: 954, comm: sh Not tainted 2.6.24-rc3-ge1cca7e8-dirty #3 > [<c0103a04>] show_trace_log_lvl+0x35/0x54 > [<c010450a>] show_trace+0x2c/0x2e > [<c0104e6d>] dump_stack+0x84/0x8a > [<c01ded7c>] spin_bug+0xa7/0xae > [<c01def14>] _raw_spin_lock+0x45/0xfa > [<c02a02b1>] _spin_lock_irqsave+0x68/0x7a > [<c01087e2>] pit_read+0xf/0x91 > [<c0130ee1>] get_monotonic_cycles+0xf/0x2d > [<c013c0e7>] now+0x2a/0x7c > [<c013c333>] ____trace+0x4d/0x1e8 > [<c013dbeb>] __mcount+0x95/0xa6 > [<c010d354>] mcount+0x14/0x18 > [<c0135a3c>] lock_acquired+0xe/0x1d7 > [<c02a02b9>] _spin_lock_irqsave+0x70/0x7a > [<c01087e2>] pit_read+0xf/0x91 hm, it seems lock_acquired() [in kernel/lockdep.c] needs to be marked 'notrace' too - otherwise we recurse back into pit_read(). Ingo _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
