linux-kernel - [PATCH 3.16 008/254] scsi: dma-mapping: always provide dma_get_cache

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Date:   Wed, 28 Feb 2018 15:20:18 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Christoph Hellwig" <hch@....de>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 3.16 008/254] scsi: dma-mapping: always provide
 dma_get_cache_alignment

3.16.55-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Christoph Hellwig <hch@....de>

commit 860dd4424f344400b491b212ee4acb3a358ba9d9 upstream.

Provide the dummy version of dma_get_cache_alignment that always returns
1 even if CONFIG_HAS_DMA is not set, so that drivers and subsystems can
use it without ifdefs.

Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
[bwh: Backported to 3.16: Also delete the conflicting declaration in
 <asm-generic/dma-mapping-broken.h>]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -181,7 +181,6 @@ static inline void *dma_zalloc_coherent(
 	return ret;
 }
 
-#ifdef CONFIG_HAS_DMA
 static inline int dma_get_cache_alignment(void)
 {
 #ifdef ARCH_DMA_MINALIGN
@@ -189,7 +188,6 @@ static inline int dma_get_cache_alignmen
 #endif
 	return 1;
 }
-#endif
 
 /* flags for the coherent memory api */
 #define	DMA_MEMORY_MAP			0x01
--- a/include/asm-generic/dma-mapping-broken.h
+++ b/include/asm-generic/dma-mapping-broken.h
@@ -85,9 +85,6 @@ dma_supported(struct device *dev, u64 ma
 extern int
 dma_set_mask(struct device *dev, u64 mask);
 
-extern int
-dma_get_cache_alignment(void);
-
 extern void
 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 	       enum dma_data_direction direction);