ZEN: Restore CONFIG_OPTIMIZE_FOR_PERFORMANCE_O3

This reverts a6036a4 (kbuild: drop support for CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3), removes the dependency on CONFIG_ARC and adds RUSTFLAGS.
zen-kernel · Dec 11, 2022 · 7042e70 · 7042e70
1 parent b88b54d
commit 7042e70
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diff --git a/Makefile b/Makefile
@@ -823,6 +823,9 @@ KBUILD_CFLAGS	+= $(call cc-disable-warning, address-of-packed-member)
 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
 KBUILD_CFLAGS += -O2
 KBUILD_RUSTFLAGS += -Copt-level=2
+else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
+KBUILD_CFLAGS += -O3
+KBUILD_RUSTFLAGS += -Copt-level=3
 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 KBUILD_CFLAGS += -Os
 KBUILD_RUSTFLAGS += -Copt-level=s

diff --git a/init/Kconfig b/init/Kconfig
@@ -1414,6 +1414,12 @@ config CC_OPTIMIZE_FOR_PERFORMANCE
 	  with the "-O2" compiler flag for best performance and most
 	  helpful compile-time warnings.
 
+config CC_OPTIMIZE_FOR_PERFORMANCE_O3
+	bool "Optimize more for performance (-O3)"
+	help
+	  Choosing this option will pass "-O3" to your compiler to optimize
+	  the kernel yet more for performance.
+
 config CC_OPTIMIZE_FOR_SIZE
 	bool "Optimize for size (-Os)"
 	help