On Thu, 2012-07-26 at 17:47 +0200, Martin Schwidefsky wrote: > A code review revealed another potential race in regard to TLB flushing > on s390. See patch #2 for the ugly details. To fix this I would like > to use the arch_enter_lazy_mmu_mode/arch_leave_lazy_mmu_mode but to do > that the pointer to the mm in question needs to be added to the functions. > To keep things symmetrical arch_flush_lazy_mmu_mode should grow an mm > argument as well. > > powerpc I have a patch that makes sparc64 do the same thing. > and x86 have a non-empty implementation for the lazy mmu flush > primitives and tile calls the generic definition in the architecture > files (which is a bit strange because the generic definition is empty). > Comments? argh.. you're making my head hurt. I guess my first question is where is lazy_mmu_mode active crossing an mm? I thought it was only ever held across operations on a single mm. The second question would be if you could use that detach_mm thing I proposed a while back ( http://marc.info/?l=linux-mm&m=134090072917840 ) or can we rework the active_mm magic in general to make all this easier? Your 2/2 patch makes me shiver.. -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
