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| author |   Christoph Hellwig <hch@lst.de> | 2019-11-21 18:13:03 +0100 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2019-11-21 18:13:03 +0100 |
| commit | d7293f79caea45c50c0ab4294847e7af96501ced (patch) | |
| tree | 04d55fbe33562f4d242e0445baae55690ebb6682 /kernel/dma | |
| parent | dma-direct: exclude dma_direct_map_resource from the min_low_pfn check (diff) | |
| parent | arm64: mm: reserve CMA and crashkernel in ZONE_DMA32 (diff) | |
| download | linux-dev-d7293f79caea45c50c0ab4294847e7af96501ced.tar.xz linux-dev-d7293f79caea45c50c0ab4294847e7af96501ced.zip | |
Merge branch 'for-next/zone-dma' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux into dma-mapping-for-next
Pull in a stable branch from the arm64 tree that adds the zone_dma_bits
variable to avoid creating hard to resolve conflicts with that addition.
Diffstat (limited to 'kernel/dma')
| -rw-r--r-- | kernel/dma/direct.c | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c index 40f1f0aac4b1..267b23a13b69 100644 --- a/kernel/dma/direct.c +++ b/kernel/dma/direct.c @@ -17,12 +17,11 @@ #include <linux/swiotlb.h> /* - * Most architectures use ZONE_DMA for the first 16 Megabytes, but - * some use it for entirely different regions: + * Most architectures use ZONE_DMA for the first 16 Megabytes, but some use it + * it for entirely different regions. In that case the arch code needs to + * override the variable below for dma-direct to work properly. */ -#ifndef ARCH_ZONE_DMA_BITS -#define ARCH_ZONE_DMA_BITS 24 -#endif +unsigned int zone_dma_bits __ro_after_init = 24; static void report_addr(struct device *dev, dma_addr_t dma_addr, size_t size) { @@ -76,7 +75,7 @@ static gfp_t __dma_direct_optimal_gfp_mask(struct device *dev, u64 dma_mask, * Note that GFP_DMA32 and GFP_DMA are no ops without the corresponding * zones. */ - if (*phys_mask <= DMA_BIT_MASK(ARCH_ZONE_DMA_BITS)) + if (*phys_mask <= DMA_BIT_MASK(zone_dma_bits)) return GFP_DMA; if (*phys_mask <= DMA_BIT_MASK(32)) return GFP_DMA32; @@ -485,7 +484,7 @@ int dma_direct_supported(struct device *dev, u64 mask) u64 min_mask; if (IS_ENABLED(CONFIG_ZONE_DMA)) - min_mask = DMA_BIT_MASK(ARCH_ZONE_DMA_BITS); + min_mask = DMA_BIT_MASK(zone_dma_bits); else min_mask = DMA_BIT_MASK(32); |