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/linux-3.4.99/Documentation/
Ddma-buf-sharing.txt12 either the 'exporter' of buffers, or the 'user' of buffers.
15 exporter, and A as buffer-user.
17 The exporter
34 - *may* be exported to user space using "mmap" *ONLY* by exporter, outside of
48 4. When needed, buffer-user requests access to the buffer from exporter
49 5. When finished with its use, the buffer-user notifies end-of-DMA to exporter
56 The buffer exporter announces its wish to export a buffer. In this, it
94 helps the exporter to know of device buffer constraints.
102 operation, if provided by the exporter.
107 Until this stage, the buffer-exporter has the option to choose not to actually
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/linux-3.4.99/mm/
Dmmap.c534 struct vm_area_struct *exporter = NULL; in vma_adjust() local
543 exporter = next; in vma_adjust()
551 exporter = next; in vma_adjust()
560 exporter = vma; in vma_adjust()
569 if (exporter && exporter->anon_vma && !importer->anon_vma) { in vma_adjust()
570 if (anon_vma_clone(importer, exporter)) in vma_adjust()
572 importer->anon_vma = exporter->anon_vma; in vma_adjust()