On Thu, Mar 12, 2015 at 10:39 AM, Oleg Nesterov <o...@redhat.com> wrote: > On 03/12, Andy Lutomirski wrote: >> >> On Thu, Mar 12, 2015 at 9:54 AM, Oleg Nesterov <o...@redhat.com> wrote: >> > On 03/12, Andy Lutomirski wrote: >> >> >> > As for 32-bit applications. Yes, this can't work because 32-bit simply >> > can't access this "high" memory. But you know, it would be very nice to >> > have the fixmap-like "global" area in init_mm which is also visible to >> > compat applications. If we had it, uprobes could work without xol vma's. >> > >> It could work for 32-bit native, but not for 32-bit compat. > > Yes, yes, I meant 32-bit compat apps. Once again, it would be nice if we > had the "low" fixmaps in init_mm. But unlikely this is possible... > >> On a related note, I'm hoping to rework the mm part pretty heavily: >> >> http://lkml.kernel.org/r/cover.1414629045.git.l...@amacapital.net > > OK... not that I really understand this email. > > Well. Speaking of vdso. I understand that unlikely we can do this, but > for uprobes it would be nice to have a anon-inode file behind this mapping, > so that vma_interval_tree_foreach() could work, etc. OK, this is completely > off-topic, please forget.
Couldn't you do that directly in the uprobes code? That is, create an anon_inode file and just map it the old-fashioned way? --Andy > > > > And I noticed that I didn't read your previous email carefully enough... > >> That sounds reasonable to me. I'll write the patch later today. > > Sure, please send a patch if you want to do this. > >> gdb will still need changes, though, right? > > This is up to gdb developers. To me, it should simply skip this > VM_DONTDUMP vma. > > Oleg. > -- Andy Lutomirski AMA Capital Management, LLC -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
