[v4,3/6] dma-mapping: Remove dma_check_mask()
diff mbox series

Message ID 20190806044919.10622-4-bauerman@linux.ibm.com
State Accepted
Commit e740815a97e2b6d6446792f4328378e66de166d1
Headers show
Series
  • Remove x86-specific code from generic headers
Related show

Checks

Context Check Description
snowpatch_ozlabs/checkpatch success total: 0 errors, 0 warnings, 0 checks, 26 lines checked
snowpatch_ozlabs/apply_patch success Successfully applied on branch next (f3365d1a959d5c6527efe3d38276acc9b58e3f3f)

Commit Message

Thiago Jung Bauermann Aug. 6, 2019, 4:49 a.m. UTC
sme_active() is an x86-specific function so it's better not to call it from
generic code. Christoph Hellwig mentioned that "There is no reason why we
should have a special debug printk just for one specific reason why there
is a requirement for a large DMA mask.", so just remove dma_check_mask().

Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
---
 kernel/dma/mapping.c | 8 --------
 1 file changed, 8 deletions(-)

Patch
diff mbox series

diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c
index 1f628e7ac709..61eeefbfcb36 100644
--- a/kernel/dma/mapping.c
+++ b/kernel/dma/mapping.c
@@ -291,12 +291,6 @@  void dma_free_attrs(struct device *dev, size_t size, void *cpu_addr,
 }
 EXPORT_SYMBOL(dma_free_attrs);
 
-static inline void dma_check_mask(struct device *dev, u64 mask)
-{
-	if (sme_active() && (mask < (((u64)sme_get_me_mask() << 1) - 1)))
-		dev_warn(dev, "SME is active, device will require DMA bounce buffers\n");
-}
-
 int dma_supported(struct device *dev, u64 mask)
 {
 	const struct dma_map_ops *ops = get_dma_ops(dev);
@@ -327,7 +321,6 @@  int dma_set_mask(struct device *dev, u64 mask)
 		return -EIO;
 
 	arch_dma_set_mask(dev, mask);
-	dma_check_mask(dev, mask);
 	*dev->dma_mask = mask;
 	return 0;
 }
@@ -345,7 +338,6 @@  int dma_set_coherent_mask(struct device *dev, u64 mask)
 	if (!dma_supported(dev, mask))
 		return -EIO;
 
-	dma_check_mask(dev, mask);
 	dev->coherent_dma_mask = mask;
 	return 0;
 }