X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=arch%2Fx86%2FMakefile;h=2d8b9d8ca4f8753291bb1487fb0b77d7b6009280;hb=1fbf3e48123d701584bc75ccac67ef2fe412ac4c;hp=9c5a67d1b9c1b1d40e853b0ac902670465973974;hpb=41b8687191cfd0326db03b0e82fb09d8c98ca641;p=platform%2Fkernel%2Flinux-rpi.git

diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 9c5a67d..2d8b9d8 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -187,7 +187,6 @@ cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,
 cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)
 
 # does binutils support specific instructions?
-asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
 asinstr += $(call as-instr,pshufb %xmm0$(comma)%xmm0,-DCONFIG_AS_SSSE3=1)
 avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
 avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1)
@@ -217,6 +216,11 @@ KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
 # Avoid indirect branches in kernel to deal with Spectre
 ifdef CONFIG_RETPOLINE
   KBUILD_CFLAGS += $(RETPOLINE_CFLAGS)
+  # Additionally, avoid generating expensive indirect jumps which
+  # are subject to retpolines for small number of switch cases.
+  # clang turns off jump table generation by default when under
+  # retpoline builds, however, gcc does not for x86.
+  KBUILD_CFLAGS += $(call cc-option,--param=case-values-threshold=20)
 endif
 
 archscripts: scripts_basic