Re: [PATCH 2/3] x86-64: Clean up vsyscall emulation and removefixed-address ret

[Andrew Lutomirski]

On Mon, Jun 6, 2011 at 1:41 PM, Ingo Molnar <mingo@xxxxxxx> wrote:
>
> * Andy Lutomirski <luto@xxxxxxx> wrote:
>
>> Remove the fixed-address ret in the vsyscall emulation stubs.  As a
>> result, int 0xcc no longer works if executed from user address space
>> (which is OK -- nothing sensible should do that).
>>
>> Removing support for int 0xcc in user address space cleans up the
>> code considerably.
>>
>> Signed-off-by: Andy Lutomirski <luto@xxxxxxx>
>> ---
>>  arch/x86/include/asm/vsyscall.h   |   10 ++++-
>>  arch/x86/kernel/vsyscall_64.c     |   78 +++++++++++--------------------------
>>  arch/x86/kernel/vsyscall_emu_64.S |   17 +--------
>>  3 files changed, 32 insertions(+), 73 deletions(-)
>
> Ok, this makes the whole series a lot more palatable!
>
> Can i propagate the rename suggested by hpa into patch #3:
>
>  CONFIG_COMPAT_VSYSCALL => CONFIG_LEGACY_VSYSCALL

Certainly!  CONFIG_LEGACY_VTIME might be even better, but I'm fine
with any renaming you'd like to do.

--Andy

>
> ? 'legacy' is probably the best name for this and it thus won't be
> confused with the 32-bit compat facilities we have.
>
> Thanks,
>
>        Ingo
>
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