* Oleg Nesterov <o...@redhat.com> [2012-08-08 19:37:47]: > Add the new MMF_HAS_UPROBES flag. It is set by install_breakpoint() > and it is copied by dup_mmap(), uprobe_pre_sstep_notifier() checks > it to avoid the slow path if the task was never probed. Perhaps it > makes sense to check it in valid_vma(is_register => false) as well. > > This needs the new dup_mmap()->uprobe_dup_mmap() hook. We can't use > uprobe_reset_state() or put MMF_HAS_UPROBES into MMF_INIT_MASK, we > need oldmm->mmap_sem to avoid the race with uprobe_register() or > mmap() from another thread. > > Currently we never clear this bit, it can be false-positive after > uprobe_unregister() or uprobe_munmap() or if dup_mmap() hits the > probed VM_DONTCOPY vma. But this is fine correctness-wise and has > no effect unless the task hits the non-uprobe breakpoint. > > Signed-off-by: Oleg Nesterov <o...@redhat.com> Acked-by: Srikar Dronamraju <sri...@linux.vnet.ibm.com>
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