linux-kernel - Re: [RFC] arm: add __initbss section attribute

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Date:	Tue, 13 Oct 2015 15:33:10 +0800
From:	yalin wang <yalin.wang2010@...il.com>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Will Deacon <will.deacon@....com>,
	Nicolas Pitre <nico@...aro.org>,
	Kees Cook <keescook@...omium.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Victor Kamensky <victor.kamensky@...aro.org>,
	Mark Salter <msalter@...hat.com>, vladimir.murzin@....com,
	ggdavisiv@...il.com, paul.gortmaker@...driver.com,
	mingo@...nel.org, rusty@...tcorp.com.au, mcgrof@...e.com,
	akpm@...ux-foundation.org, kirill.shutemov@...ux.intel.com,
	n-horiguchi@...jp.nec.com, aarcange@...hat.com, mhocko@...e.com,
	jack@...e.cz, iamjoonsoo.kim@....com, xiexiuqi@...wei.com,
	vbabka@...e.cz, Vineet.Gupta1@...opsys.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC] arm: add __initbss section attribute


> On Oct 13, 2015, at 04:04, Sam Ravnborg <sam@...nborg.org> wrote:
> 
>> --- a/include/asm-generic/vmlinux.lds.h
>> +++ b/include/asm-generic/vmlinux.lds.h
>> 
>> -#define BSS_SECTION(sbss_align, bss_align, stop_align)			\
>> +#define BSS_SECTION(sbss_align, bss_align, initbss_align, stop_align)			\
> 
> A few comments:
> 
> 1) - please align the backslash at the end of the
>     line with the backslash above it.
> 2) - you need to fix all the remaining users of BSS_SECTION.
> 3) - do we really need the flexibility to specify an alignment (stop_align)?
>        If not - drop the extra argument.
> 
> 	Sam
i change lots of __initdata to __initbss to test it on ARM arch,


Download attachment "initbss_change.diff" of type "application/octet-stream" (101068 bytes)


build result :


yalin@...ntu:~/linux-next$ ll ../kernel_out_arm/arch/arm/boot/*Image*
-rwxrwxr-x 1 yalin yalin 14487552 Oct 13 15:08 ../kernel_out_arm/arch/arm/boot/Image*       # apply the patch
-rwxrwxr-x 1 yalin yalin 14512128 Oct 12 11:48 ../kernel_out_arm/arch/arm/boot/Image_old*
-rwxrwxr-x 1 yalin yalin  6479568 Oct 13 15:08 ../kernel_out_arm/arch/arm/boot/zImage*    # apply the patch
-rwxrwxr-x 1 yalin yalin  6479664 Oct 12 17:31 ../kernel_out_arm/arch/arm/boot/zImage_old*


Image size shrink about 24576 bytes
zImage seems not change much .

it will be more useful for platform which don’t use compress Image like ARM64 / x86 platform i think.

Thanks