[PATCH 4/7] mm: cma: Export dma_contiguous_default_area

[Maxime Ripard]

The CMA dma-buf heap uses the dev_get_cma_area() inline function that
would either return the content of device.cma_area or the content of
dma_contiguous_default_area.

The latter holds a pointer to the default CMA region, and is stored in a
public variable. However, that variable isn't exported which prevents to
use dev_get_cma_area() in modules.

Since we want to turn the CMA heap into a module, let's export
dma_contiguous_default_area to allow modules to use dev_get_cma_area().

Signed-off-by: Maxime Ripard <mripard@xxxxxxxxxx>
---
 kernel/dma/contiguous.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/dma/contiguous.c b/kernel/dma/contiguous.c
index 14bd54fb758537f01a6fe27318e7b683964e20b1..fb64ccb99243e3cfea4890391a723130db69ee94 100644
--- a/kernel/dma/contiguous.c
+++ b/kernel/dma/contiguous.c
@@ -52,10 +52,11 @@
 #else
 #define CMA_SIZE_MBYTES 0
 #endif
 
 struct cma *dma_contiguous_default_area;
+EXPORT_SYMBOL_GPL(dma_contiguous_default_area);
 
 /*
  * Default global CMA area size can be defined in kernel's .config.
  * This is useful mainly for distro maintainers to create a kernel
  * that works correctly for most supported systems.

-- 
2.53.0