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

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Message-ID: <5171473.bOz59Zi81c@wuerfel>
Date:	Tue, 13 Oct 2015 13:28:18 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	yalin wang <yalin.wang2010@...il.com>
Cc:	Sam Ravnborg <sam@...nborg.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	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 Tuesday 13 October 2015 17:51:32 yalin wang wrote:

> > 32	__earlycon_table_sentinel
> > 200	__earlycon_of_table_sentinel
> > 6	__irf_end
> > 
> > 
> > 26398 total
> i am curious about your scripts ,
> could you show me ?

I was using some ad-hoc command line tricks, including

objcopy  -j .init.data  build/multi_v7_defconfig/vmlinux   /tmp/initdata
nm initdata  | sort -n | { read start b sym ; while read a b c ; do objdump -Dr --start-address=0x$start --stop-address=0x$a initdata > initdata.d/$sym  ; start=$a ; sym=$c  ; done }
(some manual sorting to delete the files that have pre-initialized symbols)
sum=0 ; nm /tmp/initdata  | sort -n | { read start b sym ; while read a b c ; do test -e ../$sym  && { echo $[0x$a - 0x$start]\      $sym  ; sum=$[$sum + $[0x$a - 0x$start]] ; } ; start=$a ; sym=$c ; done ; echo $sum;}

I'm sure there are better ways to do this, and the manual step I used at
first was faulty.

	Arnd
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