• Thomas Gleixner's avatar
    x86: cleanup PAT cpu validation · 8d4a4300
    Thomas Gleixner authored
    Move the scattered checks for PAT support to a single function. Its
    moved to addon_cpuid_features.c as this file is shared between 32 and
    64 bit.
    
    Remove the manipulation of the PAT feature bit and just disable PAT in
    the PAT layer, based on the PAT bit provided by the CPU and the
    current CPU version/model white list.
    
    Change the boot CPU check so it works on Voyager somewhere in the
    future as well :) Also panic, when a secondary has PAT disabled but
    the primary one has alrady switched to PAT. We have no way to undo
    that.
    
    The white list is kept for now to ensure that we can rely on known to
    work CPU types and concentrate on the software induced problems
    instead of fighthing CPU erratas and subtle wreckage caused by not yet
    verified CPUs. Once the PAT code has stabilized enough, we can remove
    the white list and open the can of worms.
    Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    8d4a4300
pat.h 514 Bytes