Messages in this thread | | | From | Andy Lutomirski <> | Date | Wed, 12 Mar 2014 16:43:34 -0700 | Subject | Re: [PATCH v2] x86: Remove compat vdso support |
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On Wed, Mar 12, 2014 at 4:06 PM, H. Peter Anvin <hpa@linux.intel.com> wrote: > On 03/12/2014 02:49 PM, Andy Lutomirski wrote: >> On Wed, Mar 12, 2014 at 2:46 PM, Linus Torvalds >> <torvalds@linux-foundation.org> wrote: >>> On Wed, Mar 12, 2014 at 2:37 PM, H. Peter Anvin <hpa@linux.intel.com> wrote: >>>> >>>> How would that deal with the legacy vsyscall case for x86-64? Just rely >>>> on the "legacy vsyscall emulation" (which seems to have its own class of >>>> problems...)? >>> >>> It does? >>> >>> We *default* to emulation, and have for over two years now (since >>> v3.4). If there are problems with it, we need to fix those. >> >> Even in the non-default "vsyscall=native" case, the vsyscall pages >> just contains syscalls. It does not need to access the vvar page, the >> hpet, or anything else that the vdso uses. >> > > Ah, right. I let that detail slip the mind. > > I do hear vsyscall=native still being used as a workaround for problems, > but yes, just making it call the kernel is fine, of course.
Next time you hear that, can you let me know? I haven't heard of any issues since 3.4 IIRC.
--Andy
> > So yes, this does make it all better. > > -hpa > >
-- Andy Lutomirski AMA Capital Management, LLC
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