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SubjectRe: [PATCH v3 -next 3/5] arm: Add support for LZ4-compressed kernel
On Tue,  5 Mar 2013 20:47:34 +0900 Kyungsik Lee <kyungsik.lee@lge.com> wrote:

> This patch integrates the LZ4 decompression code to the arm pre-boot code.
> And it depends on two patchs below
>
> lib: Add support for LZ4-compressed kernel
> decompressor: Add LZ4 decompressor module
>
> ...
>
> - Apply CFLAGS, -Os to decompress.o to improve decompress
> performance during boot-up process
>
> ...
>
> --- a/arch/arm/boot/compressed/Makefile
> +++ b/arch/arm/boot/compressed/Makefile
> @@ -24,6 +24,9 @@ endif
> AFLAGS_head.o += -DTEXT_OFFSET=$(TEXT_OFFSET)
> HEAD = head.o
> OBJS += misc.o decompress.o
> +ifeq ($(CONFIG_KERNEL_LZ4),y)
> +CFLAGS_decompress.o := -Os
> +endif

Surprised. You found that -Os produces faster code than -O2? Details,
please?



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