[2/4] dma-direct: Turn zone_dma_bits default value into a define

Commit Message

Nicolas Saenz Julienne Oct. 1, 2020, 4:17 p.m. UTC

Other code might need to reference it.

Signed-off-by: Nicolas Saenz Julienne <[e-mail]>
---
 include/linux/dma-direct.h | 1 +
 kernel/dma/direct.c        | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

Patch

diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h
index 38ed3b55034d..ef19ff505d09 100644
--- a/include/linux/dma-direct.h
+++ b/include/linux/dma-direct.h
@@ -12,6 +12,7 @@ 
 #include <linux/mem_encrypt.h>
 #include <linux/swiotlb.h>
 
+#define ZONE_DMA_BITS_DEFAULT	24
 extern unsigned int zone_dma_bits;
 
 /*
diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index 121a9c1969dd..4b3cfa02532b 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)