On Thursday 10 August 2006 18:04, Ben Weintraub wrote: > Howdy, > > I'm wondering if anyone has had success getting Ingo Molnar's realtime > preemption patch (the one here: > http://people.redhat.com/mingo/realtime-preempt/ ) working on the ppc > arch.
I have gotten them to work with MPC7448 boards, but it has hardware floating point, so no math-emu problems. > Anyhow, when I boot on an MPC8555 with my hack, I get an endless stream > of: > > BUG: sleeping function called from invalid context init(1) at > arch/powerpc/math-emu/math.c:226 > in_atomic():0 [00000000], irqs_disabled():1 > Call Trace: > [A0BB3E90] [A000934C] show_stack+0x48/0x194 (unreliable) > [A0BB3EC0] [A001B7DC] __might_sleep+0xe8/0xf4 > [A0BB3EE0] [A00136C0] do_mathemu+0x30/0x8c8 > [A0BB3F00] [A00036AC] program_check_exception+0x1ac/0x514 > [A0BB3F40] [A0002A08] ret_from_except_full+0x0/0x4c > > Line 226 in arch/powerpc/math-emu/math.c is part of the do_mathemu() > function, and contains a call to get_user(), which calls > __might_sleep(), causing this problem. >
