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The buffer can be read and written by a kernel. This is the default. |
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The buffer can be written but not read by a kernel. Reading from the buffer inside a kernel is undefined. |
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The buffer can be read but not written by a kernel. Writing to the buffer inside a kernel is undefined. |
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The buffer is initialized with the data referenced by the provided host memory pointer. |
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The buffer is allocated from host accessible memory. |
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The buffer is allocated from host accessible memory, and initialized with the data referenced by the provided host memory pointer. |