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SubjectRe: [PATCH v2 4/8] x86/spec_ctrl: Add sysctl knobs to enable/disable SPEC_CTRL feature
On 01/05/2018 06:12 PM, Tim Chen wrote:
> .macro ENABLE_IBRS
> - ALTERNATIVE "jmp .Lskip_\@", "", X86_FEATURE_SPEC_CTRL
> + testl $1, dynamic_ibrs
> + jz .Lskip_\@

There was an earlier suggestion to use STATIC_JUMP_IF_... here. That's
a good suggestion, but we encountered some issues with it either
crashing the kernel at boot or not properly turning on/off.

We would love to do that minor really soon, but we figured everyone
would rather see this version than wait for us to debug such a minor tweak.

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