linux-kernel - changing module from single to multi-file build

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Date:	Tue, 13 Oct 2009 09:24:27 +0100
From:	Ben Dooks <ben@...ff.org.uk>
To:	sam@...nborg.org, linux-kernel@...r.kernel.org
Cc:	spi-devel-general@...ts.sourceforge.net
Subject: changing module from single to multi-file build

I have a driver, drivers/spi/spi_s3c24xx.c in this case that I have
written an FIQ handler for which requires some assembly code. My attempts
at trying to change it so that I can build a single module with both the
C and ASM code linked together have not yet been a success.

The original makefile bit from drivers/spi/Makefile was:

 obj-$(CONFIG_SPI_S3C24XX)              += spi_s3c24xx.o

This allows it to work as a kernel builtin:

 obj-$(CONFIG_SPI_S3C24XX)              += spi_s3c24xx.o
 obj-$(CONFIG_SPI_S3C24XX_FIQ)          += spi_s3c24xx_fiq.o

I tried adding the following to the file, but this does not make
the FIQ code, I assume as there is still drivers/spi/spi_s3c24xx.c.

 obj-spi_s3c24xx-y                      := spi_s3c24xx.o
 obj-spi_s3c24xx-$(CONFIG_SPI_S3C24XX_FIQ) += spi_s3c24xx_fiq.o

Should I rename drivers/spi/spi_s3c24xx.c to something else to avoid
changing the module name, change the module name to avoid renaming the .c
to say  spi_s3c24xx_hw (we have a gpio implementation, but that could easily
be removed in favour of gpiolib). Or is there something else that could
be done?

Note, I was initially against renaming the module, but with module autoload
working so well it seems easier to rename the module than try renaming the
.c file.

-- 
Ben (ben@...ff.org, http://www.fluff.org/)

  'a smiley only costs 4 bytes'
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