• Vincent Minet's avatar
    intel_pstate: Set CPU number before accessing MSRs · 179e8471
    Vincent Minet authored
    Ensure that cpu->cpu is set before writing MSR_IA32_PERF_CTL during CPU
    initialization. Otherwise only cpu0 has its P-state set and all other
    cores are left with their values unchanged.
    
    In most cases, this is not too serious because the P-states will be set
    correctly when the timer function is run.  But when the default governor
    is set to performance, the per-CPU current_pstate stays the same forever
    and no attempts are made to write the MSRs again.
    Signed-off-by: default avatarVincent Minet <vincent@vincent-minet.net>
    Cc: All applicable <stable@vger.kernel.org>
    Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
    179e8471
intel_pstate.c 22.9 KB