• Jan Beulich's avatar
    x86/cpu: Track legacy CPU model data only on 32-bit kernels · 09dc68d9
    Jan Beulich authored
    struct cpu_dev's c_models is only ever set inside CONFIG_X86_32
    conditionals (or code that's being built for 32-bit only), so
    there's no use of reserving the (empty) space for the model
    names in a 64-bit kernel.
    
    Similarly, c_size_cache is only used in the #else of a
    CONFIG_X86_64 conditional, so reserving space for (and in one
    case even initializing) that field is pointless for 64-bit
    kernels too.
    
    While moving both fields to the end of the structure, I also
    noticed that:
    
     - the c_models array size was one too small, potentially causing
       table_lookup_model() to return garbage on Intel CPUs (intel.c's
       instance was lacking the sentinel with family being zero), so the
       patch bumps that by one,
    
     - c_models' vendor sub-field was unused (and anyway redundant
       with the base structure's c_x86_vendor field), so the patch deletes it.
    
    Also rename the legacy fields so that their legacy nature stands out
    and comment their declarations.
    Signed-off-by: default avatarJan Beulich <jbeulich@suse.com>
    Link: http://lkml.kernel.org/r/5265036802000078000FC4DB@nat28.tlf.novell.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
    09dc68d9
umc.c 461 Bytes