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

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Message-ID: <BANLkTi=y60Jt3-OMzbxQJzGkvzCzNJfJtA@mail.gmail.com>
Date:	Tue, 10 May 2011 23:32:46 -0400
From:	Mike Frysinger <vapier.adi@...il.com>
To:	Alessio Igor Bogani <abogani@...nel.org>
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

On Sat, Apr 16, 2011 at 09:26, Alessio Igor Bogani wrote:
> In the first place I changed the code for place every symbol in a different
> section (for example: "___ksymtab" sec "__" #sym) at compile time (this the
> above mentioned trick!). Thus I request to the linker to sort and merge all
> these sections into the appropriate ones (for example: "__ksymtab") at link
> time using the linker scripts. Once all symbols are sorted we can use binary
> search instead of the linear one.

this breaks symbol prefixed arches (like Blackfin):
  CC      kernel/softirq.o
/tmp/ccp3A6LU.s: Assembler messages:
/tmp/ccp3A6LU.s:3734: Error: symbol `___ksymtab__local_bh_enable' is
already defined
make[1]: *** [kernel/softirq.o] Error 1

this is because your new system of section naming happens to overlap
actual symbol names and the gnu assembler does not allow you to
declare a section and a symbol with the same name.

might be better to pick a separator that cannot appear in a symbol
name.  so rather than "__", use "+".  or some other funky char.
-mike
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