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dma-mapping: prevent dma dependent code from linking on !HAS_DMA archs

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Continuing the work started in 411f0f3edc ...

This enables code with a dma path, that compiles away, to build without
requiring additional code factoring.  It also prevents code that calls
dma_alloc_coherent and dma_free_coherent from linking whereas previously
the code would hit a BUG() at run time.  Finally, it allows archs that set
!HAS_DMA to delete their asm/dma-mapping.h file.

Cc: Cornelia Huck <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: John W. Linville <[email protected]>
Cc: Kyle McMartin <[email protected]>
Cc: James Bottomley <[email protected]>
Cc: Tejun Heo <[email protected]>
Cc: Jeff Garzik <[email protected]>
Cc: <[email protected]>
Cc: <[email protected]>
Cc: <[email protected]>
Cc: <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Dan Williams 2007-07-15 23:40:26 -07:00 • committed by Linus Torvalds
commit 1b0fac4587
10 changed files with 84 additions and 34 deletions
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2
drivers/dma/Kconfig
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@ -3,7 +3,7 @@
#
menu "DMA Engine support"
depends on !S390
depends on HAS_DMA
config DMA_ENGINE
bool "Support for DMA engines"