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-rw-r--r--arch/x86/Makefile5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 9c5a67d1b9c1..f55420a67164 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -217,6 +217,11 @@ 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