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Commit c45b4f1f authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Move size optimization option outside of EMBEDDED menu, mark it EXPERIMENTAL 



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: default avatarLinus Torvalds <torvalds@osdl.org>
parent 11c18b5c

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