Move size optimization option outside of EMBEDDED menu, mark it EXPERIMENTAL (c45b4f1f) · Commits · 戴 / test

Also, disable on sparc64 - a number of people report breakage. Probably a compiler bug, but it's quite possible that it tickles some latent kernel problem too. It still defaults to 'y' everywhere else (when enabled through EXPERIMENTAL), and Dave Jones points out that Fedora (and RHEL4) has been building with size optimizations for a long time on x86, x86-64, ia64, s390, s390x, ppc32 and ppc64. So it is really only moderately experimental, but the sparc64 breakage certainly shows that it can trigger "issues". Signed-off-by:

Linus Torvalds <torvalds@osdl.org>

init/Kconfig

+14 −12

Original line number	Diff line number	Diff line
		@@ -256,6 +256,20 @@ config CPUSETS

		source "usr/Kconfig"

		config CC_OPTIMIZE_FOR_SIZE
		bool "Optimize for size (Look out for broken compilers!)"
		default y
		depends on ARM \|\| H8300 \|\| EXPERIMENTAL
		depends on !SPARC64
		help
		Enabling this option will pass "-Os" instead of "-O2" to gcc
		resulting in a smaller kernel.

		WARNING: some versions of gcc may generate incorrect code with this
		option. If problems are observed, a gcc upgrade may be needed.

		If unsure, say N.

		menuconfig EMBEDDED
		bool "Configure standard kernel features (for small systems)"
		help
		@@ -338,18 +352,6 @@ config EPOLL
		Disabling this option will cause the kernel to be built without
		support for epoll family of system calls.

		config CC_OPTIMIZE_FOR_SIZE
		bool "Optimize for size"
		default y if ARM \|\| H8300
		help
		Enabling this option will pass "-Os" instead of "-O2" to gcc
		resulting in a smaller kernel.

		WARNING: some versions of gcc may generate incorrect code with this
		option. If problems are observed, a gcc upgrade may be needed.

		If unsure, say N.

		config SHMEM
		bool "Use full shmem filesystem" if EMBEDDED
		default y

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