On Thu, Feb 14, 2002 at 05:56:31PM -0800, Jun Sun wrote: > I have been chasing a FPU register corruption problem on a SMP box. The > curruption seems to be caused by FPU emulator code. Is that code SMP safe? > If not, what are the volunerable spots? > > Just thought I'd check before I dive into it .... In theory the fp emulation code should be MP safe as the full emulation is only accessing it's context in the fp register set of struct task_struct. The 32-bit kernel's fp register switching is entirely broken (read: close to non-existant). Lots of brownie points for somebody to backport that from the 64-bit kernel to the 32-bit kernel and forward port all the FPU emu bits to the 64-bit kernel ... > BTW, I think even with the latest fpu emu patch, the classic fpu/signal > problem is still there. I will post in a separate email later. Urgs ... Ralf
