Merge tag 'x86_fpu_for_v7.4_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 FPU state updates from Borislav Petkov:

 - Document and cleanup the signal frame handling with the goal to allow
   process migration between CPUs with different FPU capabilities but
   which use only a common set of FPU features, i.e., think
   checkpoint/restore (Andrei Vagin)

 - Consolidate how XSTATE features are checked by doing them once during
   boot with the intent of removing cpu_has_xfeatures(). Latter will
   happen in the next cycle (Eric Biggers)

 - Other cleanups

* tag 'x86_fpu_for_v7.4_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/fpu: Remove additional remnants of math emulation
  x86/fpu: Remove unnecessary checks for X86_FEATURE_FPU
  selftests/x86: Add tests for signal frame FPU portability
  x86/fpu: Pre-fault only required size of xstate buffer
  x86/fpu: Fix potential underflow in xstate_calculate_size()
  x86/fpu: Document reasoning of FX-only fallback
  x86/fpu: Extract restore_from_ia32_fxstate() and clean up fpu__restore_sig()
  x86/fpu: Clean up and rename variables in signal frame handling
  x86/fpu: Document signal frame layout and portability
  xor: Add AVX-512 optimized xor_gen()
  xor: Remove redundant X86_FEATURE_OSXSAVE check
  lib/crc: x86: Stop using cpu_has_xfeatures()
  lib/crypto: x86: Stop using cpu_has_xfeatures()
  crypto: x86 - Stop using cpu_has_xfeatures()
  um: Check for missing AVX and AVX-512 xstate bits
  x86/fpu: Check for missing AVX and AVX-512 xstate bits

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