[PATCH v3 5/8] dma-direct: Turn zone_dma_bits default value into a define

Nicolas Saenz Julienne
2020-10-14T19:12:28Z

Set zone_dma_bits default value through a define so as for architectures
to be able to override it with their default value.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
include/linux/dma-direct.h | 3 +++
kernel/dma/direct.c | 2 +-
2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h
index 18aade195884..e433d90cbacf 100644
--- a/include/linux/dma-direct.h
+++ b/include/linux/dma-direct.h
@@ -12,6 +12,9 @@
#include <linux/mem_encrypt.h>
#include <linux/swiotlb.h>

+#ifndef ZONE_DMA_BITS_DEFAULT
+#define ZONE_DMA_BITS_DEFAULT 24
+#endif
extern unsigned int zone_dma_bits;

/*
diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index 06c111544f61..c0d97f536e93 100644
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -20,7 +20,7 @@
* it for entirely different regions. In that case the arch code needs to
* override the variable below for dma-direct to work properly.
*/
-unsigned int zone_dma_bits __ro_after_init = 24;
+unsigned int zone_dma_bits __ro_after_init = ZONE_DMA_BITS_DEFAULT;

static inline dma_addr_t phys_to_dma_direct(struct device *dev,
phys_addr_t phys)
--
2.28.0