Re: [RFC PATCH v3 08/15] sched/clock, x86: Make __sched_clock_stable forceful

On Tue, Nov 19, 2024 at 04:34:55PM +0100, Valentin Schneider wrote:

Later commits will cause objtool to warn about non __ro_after_init static keys being used in .noinstr sections in order to safely defer instruction patching IPIs targeted at NOHZ_FULL CPUs.

__sched_clock_stable is used in .noinstr code, and can be modified at runtime (e.g. KVM module loading). Suppressing the text_poke_sync() IPI has

Wait, what !? loading KVM causes the TSC to be marked unstable?