diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 8d07864..70898a6 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2931,3 +2931,5 @@
 source "drivers/firmware/Kconfig"
 
 source "arch/x86/kvm/Kconfig"
+
+source "arch/x86/Kconfig.assembler"
diff --git a/arch/x86/Kconfig.assembler b/arch/x86/Kconfig.assembler
new file mode 100644
index 0000000..91230bf
--- /dev/null
+++ b/arch/x86/Kconfig.assembler
@@ -0,0 +1,17 @@
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2020 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+
+config AS_AVX2
+	def_bool $(as-instr,vpbroadcastb %xmm0$(comma)%ymm1)
+
+config AS_AVX512
+	def_bool $(as-instr,vpmovm2b %k1$(comma)%zmm5)
+
+config AS_SHA1_NI
+	def_bool $(as-instr,sha1msg1 %xmm0$(comma)%xmm1)
+
+config AS_SHA256_NI
+	def_bool $(as-instr,sha256msg1 %xmm0$(comma)%xmm1)
+
+config AS_ADX
+	def_bool $(as-instr,adox %eax$(comma)%eax)
diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index f32ef7b..b65ec63 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -177,16 +177,6 @@
 	KBUILD_CFLAGS += $(call cc-option,-maccumulate-outgoing-args,)
 endif
 
-# does binutils support specific instructions?
-avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1)
-avx512_instr :=$(call as-instr,vpmovm2b %k1$(comma)%zmm5,-DCONFIG_AS_AVX512=1)
-sha1_ni_instr :=$(call as-instr,sha1msg1 %xmm0$(comma)%xmm1,-DCONFIG_AS_SHA1_NI=1)
-sha256_ni_instr :=$(call as-instr,sha256msg1 %xmm0$(comma)%xmm1,-DCONFIG_AS_SHA256_NI=1)
-adx_instr := $(call as-instr,adox %r10$(comma)%r10,-DCONFIG_AS_ADX=1)
-
-KBUILD_AFLAGS += $(avx2_instr) $(avx512_instr) $(sha1_ni_instr) $(sha256_ni_instr) $(adx_instr)
-KBUILD_CFLAGS += $(avx2_instr) $(avx512_instr) $(sha1_ni_instr) $(sha256_ni_instr) $(adx_instr)
-
 KBUILD_LDFLAGS := -m elf_$(UTS_MACHINE)
 
 #
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index 292e71d..ed4e522 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -83,7 +83,7 @@
 		  nft_set_pipapo.o
 
 ifdef CONFIG_X86_64
-ifneq (,$(findstring -DCONFIG_AS_AVX2=1,$(KBUILD_CFLAGS)))
+ifdef CONFIG_AS_AVX2
 nf_tables-objs += nft_set_pipapo_avx2.o
 endif
 endif