Re: [PATCH 04/10] module: make MODULE_SYMBOL_PREFIX into a CONFIG option

From: Mike Frysinger
Date: Tue Nov 03 2009 - 07:30:58 EST

On Tue, Nov 3, 2009 at 07:16, Alan Jenkins wrote:
> Mike Frysinger wrote:
>> On Tue, Nov 3, 2009 at 05:06, Alan Jenkins wrote:
>>> The next commit will require the use of MODULE_SYMBOL_PREFIX in
>>> .tmp_exports-asm.S. ÂCurrently it is mixed in with C structure
>>> definitions in "asm/module.h". ÂMove the definition of this arch option
>>> into Kconfig, so it can be easily accessed by any code.
>>> This also lets modpost.c use the same definition. ÂPreviously modpost
>>> relied on a hardcoded list of architectures in mk_elfconfig.c.
>> this should also let us push VMLINUX_SYMBOL() out of
>> arch/*/kernel/ and into asm-generic/ ...
> I don't think that's possible.
> Â #define VMLINUX_SYMBOL(_sym_) _##_sym_
> I don't know any "unstringify" operation. ÂSo I can't convert a string value
> of CONFIG_SYMBOL_PREFIX to the unquoted underscore we neeed for this macro.
> ÂThe same applies for the SYM() macro I use.

let the build system do the unstringify operation.
qstrip = $(strip $(subst ",,$(1))) += -DVMLINUX_SYMBOL_PREFIX=$(call

> If we positively want to keep the generality, I guess I should put
> MODULE_SYMBOL_PREFIX in a header file of it's own. ÂThe disadvantage is that
> it makes it inaccessible to host programs again, like modpost (which
> currently hardcodes the list of affected architectures in mk_elfconfig.c).

having it in the arch Kconfig removes any and all possible
limitations, and it keeps the cruft out of the common init/Kconfig and
in the arch-specific Kconfig, and avoids a dead symbol
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