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author | Gioh Kim <gioh.kim@lge.com> | 2014-05-20 17:09:35 -0600 |
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committer | Bjorn Helgaas <bhelgaas@google.com> | 2014-05-26 17:28:28 -0600 |
commit | 2af9da8638a139303b3cd535b458a1b2c80dd4f3 (patch) | |
tree | a6480c71dd2a80363aa0b1226ab3628374c37678 | |
parent | 34c815fbdc1257e823726f8c6bcd9255d495058d (diff) | |
download | op-kernel-dev-2af9da8638a139303b3cd535b458a1b2c80dd4f3.zip op-kernel-dev-2af9da8638a139303b3cd535b458a1b2c80dd4f3.tar.gz |
DMA-API: Update dma_pool_create ()and dma_pool_alloc() descriptions
Use "boundary" to be more descriptive than "alloc" in the dma_pool_create()
documentation.
Replace "SLAB_KERNEL" and "SLAB_ATOMIC" with the correct "GFP_KERNEL" and
"GFP_ATOMIC."
[bhelgaas: changelog]
Signed-off-by: Gioh Kim <gioh.kim@lge.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
-rw-r--r-- | Documentation/DMA-API-HOWTO.txt | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/Documentation/DMA-API-HOWTO.txt b/Documentation/DMA-API-HOWTO.txt index b22ceff..dcbbe36 100644 --- a/Documentation/DMA-API-HOWTO.txt +++ b/Documentation/DMA-API-HOWTO.txt @@ -429,13 +429,13 @@ Create a dma_pool like this: struct dma_pool *pool; - pool = dma_pool_create(name, dev, size, align, alloc); + pool = dma_pool_create(name, dev, size, align, boundary); The "name" is for diagnostics (like a kmem_cache name); dev and size are as above. The device's hardware alignment requirement for this type of data is "align" (which is expressed in bytes, and must be a power of two). If your device has no boundary crossing restrictions, -pass 0 for alloc; passing 4096 says memory allocated from this pool +pass 0 for boundary; passing 4096 says memory allocated from this pool must not cross 4KByte boundaries (but at that time it may be better to use dma_alloc_coherent() directly instead). @@ -443,8 +443,8 @@ Allocate memory from a DMA pool like this: cpu_addr = dma_pool_alloc(pool, flags, &dma_handle); -flags are SLAB_KERNEL if blocking is permitted (not in_interrupt nor -holding SMP locks), SLAB_ATOMIC otherwise. Like dma_alloc_coherent(), +flags are GFP_KERNEL if blocking is permitted (not in_interrupt nor +holding SMP locks), GFP_ATOMIC otherwise. Like dma_alloc_coherent(), this returns two values, cpu_addr and dma_handle. Free memory that was allocated from a dma_pool like this: |