linux-kernel - help for kernel initcall section (init.h)

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Message-ID: <1313898848.75462.YahooMailNeo@web162014.mail.bf1.yahoo.com>
Date:	Sat, 20 Aug 2011 20:54:08 -0700 (PDT)
From:	Pintu Agarwal <pintu_agarwal@...oo.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: help for kernel initcall section (init.h)

Hi,

I need some help in modifying initcall section in init.h.

That is :

#define __define_initcall(level,fn,id) \
 static initcall_t __initcall_##fn##id __used \
 __attribute__((__section__(".initcall" level ".init"))) = fn

I have to create two different kinds (and later more) of init section and use one of them based on some condition.
For example, I have one init section for normal mode and one init section for charger mode.
During charger mode, I do not have to execute all the initcall so a charger.initcall is create with lesser init function.
The charger initcall section is as follows:
#define __define_charger_initcall(level,fn,id) \
 static initcall_t __charger_initcall_##fn##id __used \
 __attribute__((__section__(".charger.initcall" level ".init"))) = fn

Now the problem is that during compile time both of them needs to be polulated based on CHARGER_MODE is enabled or disabled.
How can this decision be taken during compile time under the macro "__define_initcall" ??

Something like :

#define __define_initcall(level,fn,id)     \
                                                       static initcall_t __initcall_##fn##id __used \
                                                       __attribute__((__section__(".initcall" level ".init"))) = fn  \
                                                       #if defined(CHARGER_MODE)  \
                                                       static initcall_t __charger_initcall_##fn##id __used  \
                                                       __attribute__((__section__(".charger.initcall" level ".init"))) = fn   \
                                                       #endif

Right now this cannot be done, as macro cannot exists inside a macro statement.

If any body have any alternative or better idea of doing this please help.

In gernal, how can I take decision during compile time itself and decide which initcall to be used instead of calling all of them.

Thanks, Regards.
Pintu
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