linux-kernel - Re: [PATCH 0/4] Speed up the symbols' resolution process V4

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Date:	Wed, 11 May 2011 17:25:40 +0200
From:	Alessio Igor Bogani <abogani@...nel.org>
To:	Mike Frysinger <vapier.adi@...il.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Tim Abbott <tabbott@...lice.com>,
	Anders Kaseorg <andersk@...lice.com>,
	Jason Wessel <jason.wessel@...driver.com>,
	Tim Bird <tim.bird@...sony.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux Embedded <linux-embedded@...r.kernel.org>
Subject: Re: [PATCH 0/4] Speed up the symbols' resolution process V4

Dear Mr. Frysinger,

2011/5/11 Mike Frysinger <vapier.adi@...il.com>:
[...]
>> Sorry I don't think that is a good choice from a long term point of
>> view. What do you think to add MODULE_SYMBOL_PREFIX to section names
>> instead? In this way symbol and section names should always be
>> different also on symbol prefixed archs (which are blackfin and
>> h8300).
>
> that doesnt work.  it simply delays the problem to another set of
> underscores.  so with that change, local_bh_enable/_local_bh_enable
> work, but now send_remote_softirq/__send_remote_softirq fail:

In my opinion it should work. if I use SYMBOL_PREFIX + two underscore
for section name I should always obtain different names.
So if SYMBOL_PREFIX is "_" section name will be "___", if
SYMBOL_PREFIX is "__" section name will be "____" and so on.

>  CC      kernel/softirq.o
> nano /tmp/cconhYy1.s: Assembler messages:
> /tmp/cconhYy1.s:3664: Error: symbol `___ksymtab___send_remote_softirq'
> is already defined
> make[1]: *** [kernel/softirq.o] Error 1

I'm a bit confused. I can build a kernel here:
$ make ARCH=blackfin CROSS_COMPILE="bfin-uclinux-" defconfig
*** Default configuration is based on 'BF537-STAMP_defconfig'
[...]
$ make ARCH=blackfin CROSS_COMPILE="bfin-uclinux-"
  CHK     include/linux/version.h
  CHK     include/generated/utsrelease.h
  CALL    scripts/checksyscalls.sh
[...]
  OBJCOPY arch/blackfin/boot/vmlinux.bin
  GZIP    arch/blackfin/boot/vmlinux.bin.gz
  UIMAGE  arch/blackfin/boot/vmImage.gz
Image Name:   bf537-0.2-2.6.39-rc3-00004-gf26a
Created:      Wed May 11 17:06:45 2011
Image Type:   Blackfin Linux Kernel Image (gzip compressed)
Data Size:    986471 Bytes = 963.35 kB = 0.94 MB
Load Address: 00001000
Entry Point:  001a8518
  Building modules, stage 2.
  MODPOST 69 modules

Unfortunately I can't make skyeye emulator works to test the obtained
kernel image.

Ciao,
Alessio
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