[PATCH] STAGING: Comedi: Build only on arches providingPAGE_KERNEL_NOCACHE

From: Ralf Baechle
Date: Thu Jun 23 2011 - 07:46:26 EST

On architectures that don't define PAGE_KERNEL_NOCACHE, the Comedi driver turns
into tragedy:

CC [M] drivers/staging/comedi/drivers.o
drivers/staging/comedi/drivers.c: In function âcomedi_buf_allocâ:
drivers/staging/comedi/drivers.c:505:41: error: âPAGE_KERNEL_NOCACHEâ undeclared (first use in this function)
drivers/staging/comedi/drivers.c:505:41: note: each undeclared identifier is rep orted only once for each function it appears in
make[3]: *** [drivers/staging/comedi/drivers.o] Error 1

Restrict the driver to only those architectures that define PAGE_KERNEL_NOCACHE.

PAGE_KERNEL_NOCACHE is a kludge - some system architectures such as SGI IP27
are even uable to offer uncached operation - at least in the way an unwitting
driver might assume. I haven't looked in details how the driver is using
the area vmaped with PAGE_KERNEL_NOCACHE but maybe doing it XFS-style using
cached memory and the flush_kernel_vmap_range / invalidate_kernel_vmap_range
APIs in conjunction with the DMA API is a practical alternative.

Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>

drivers/staging/comedi/Kconfig | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/staging/comedi/Kconfig b/drivers/staging/comedi/Kconfig
index 1502d80..bccdc12 100644
--- a/drivers/staging/comedi/Kconfig
+++ b/drivers/staging/comedi/Kconfig
@@ -2,6 +2,7 @@ config COMEDI
tristate "Data acquisition support (comedi)"
default N
depends on m
+ depends on BROKEN || FRV || M32R || MN10300 || SUPERH || TILE || X86
Enable support a wide range of data acquisition devices
for Linux.
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