linux-kernel - Re: [PATCH] Built kernel without -O2 option

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Message-ID: <20101129190546.GA14255@host0.dyn.jankratochvil.net>
Date:	Mon, 29 Nov 2010 20:05:46 +0100
From:	Jan Kratochvil <jan.kratochvil@...hat.com>
To:	Hui Zhu <teawater@...il.com>
Cc:	linux-kernel@...r.kernel.org, gdb@...rceware.org,
	hellogcc@...elists.org
Subject: Re: [PATCH] Built kernel without -O2 option

On Mon, 29 Nov 2010 04:56:15 +0100, Hui Zhu wrote:
> So I make a patch that add a option in "Kernel hacking" called "Close
> GCC optimization".  It will make kernel be built without -O2.

This seems to me as a workaround.  The real fix would be to use
	__attribute__((always_inline))
for functions requiring to be inlined and just compile everything with -O0 -g.

info '(gcc)Function Attributes'
`always_inline'
	Generally, functions are not inlined unless optimization is specified.
	For functions declared inline, this attribute inlines the function
	even if no optimization level was specified.

But `always_inline' has been discussed on linux-kernel million times.
I have not googled out a resolution why it is not applicable to this problem,
do you know why?


Thanks,
Jan
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