Re: [PATCH v11 9/9] x86/cpu: Enable LASS by default during CPU initialization

Dave Hansen
2025-10-31T16:55:03Z

On 10/30/25 14:13, David Laight wrote:
>> Unfortunately, CONFIG_X86_VSYSCALL_EMULATION defaults to y. Also, the
>> default Vsyscall mode is XONLY. So even if vsyscalls are deprecated,
>> there is a non-zero possibility someone would complain about it.
> Presumably a command line parameter could be used to disable LASS
> in order to enable vsyscall emulation?
>
> That might let LASS be enabled by default.

Sure... There are a million ways to skin this cat. That's the problem.

The compile switch is the smallest amount of code with the fewest
implications to ABI or documentation that we can muster. All I'm saying
is we should _start_ here, not _end_ here.

If anyone agrees with that approach, acks would be appreciated.