• Ingo Molnar's avatar
    Merge tag 'alternatives_padding' of... · f8e92fb4
    Ingo Molnar authored
    Merge tag 'alternatives_padding' of git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp into x86/asm
    
    Pull alternative instructions framework improvements from Borislav Petkov:
    
     "A more involved rework of the alternatives framework to be able to
      pad instructions and thus make using the alternatives macros more
      straightforward and without having to figure out old and new instruction
      sizes but have the toolchain figure that out for us.
    
      Furthermore, it optimizes JMPs used so that fetch and decode can be
      relieved with smaller versions of the JMPs, where possible.
    
      Some stats:
    
        x86_64 defconfig:
    
        Alternatives sites total:               2478
        Total padding added (in Bytes):         6051
    
      The padding is currently done for:
    
        X86_FEATURE_ALWAYS
        X86_FEATURE_ERMS
        X86_FEATURE_LFENCE_RDTSC
        X86_FEATURE_MFENCE_RDTSC
        X86_FEATURE_SMAP
    
      This is with the latest version of the patchset. Of course, on each
      machine the alternatives sites actually being patched are a proper
      subset of the total number."
    Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
    f8e92fb4
entry_32.S 32.3 KB