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author | David S. Miller <davem@davemloft.net> | 2014-08-06 05:57:18 +0400 |
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committer | David S. Miller <davem@davemloft.net> | 2014-08-06 05:57:18 +0400 |
commit | e9011d086674caeedb0ffb6eb5b8bc5920821df3 (patch) | |
tree | ed5d06353d8dc1fa5f6da349808f8345ca2291a5 /arch/arm64/mm/init.c | |
parent | cfcfe22256d5a8a14924a1145d56017b043b554f (diff) | |
parent | c78f77e20d2ba5d4d5e478e85a6fb42556893e2d (diff) | |
download | linux-e9011d086674caeedb0ffb6eb5b8bc5920821df3.tar.xz |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc
Conflicts:
arch/sparc/mm/init_64.c
Conflict was simple non-overlapping additions.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/arm64/mm/init.c')
-rw-r--r-- | arch/arm64/mm/init.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index f43db8a69262..e90c5426fe14 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -60,6 +60,17 @@ static int __init early_initrd(char *p) early_param("initrd", early_initrd); #endif +/* + * Return the maximum physical address for ZONE_DMA (DMA_BIT_MASK(32)). It + * currently assumes that for memory starting above 4G, 32-bit devices will + * use a DMA offset. + */ +static phys_addr_t max_zone_dma_phys(void) +{ + phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, 32); + return min(offset + (1ULL << 32), memblock_end_of_DRAM()); +} + static void __init zone_sizes_init(unsigned long min, unsigned long max) { struct memblock_region *reg; @@ -70,9 +81,7 @@ static void __init zone_sizes_init(unsigned long min, unsigned long max) /* 4GB maximum for 32-bit only capable devices */ if (IS_ENABLED(CONFIG_ZONE_DMA)) { - unsigned long max_dma_phys = - (unsigned long)(dma_to_phys(NULL, DMA_BIT_MASK(32)) + 1); - max_dma = max(min, min(max, max_dma_phys >> PAGE_SHIFT)); + max_dma = PFN_DOWN(max_zone_dma_phys()); zone_size[ZONE_DMA] = max_dma - min; } zone_size[ZONE_NORMAL] = max - max_dma; @@ -146,7 +155,7 @@ void __init arm64_memblock_init(void) /* 4GB maximum for 32-bit only capable devices */ if (IS_ENABLED(CONFIG_ZONE_DMA)) - dma_phys_limit = dma_to_phys(NULL, DMA_BIT_MASK(32)) + 1; + dma_phys_limit = max_zone_dma_phys(); dma_contiguous_reserve(dma_phys_limit); memblock_allow_resize(); |