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I'm trying to mmap a scatter gather list to the user space. [The scatter gather list has the same lifetime as a file descriptor to a device.] Each element of the scatter gather list is obtained from __get_free_pages() [typically order == 3]. In LDD2, Rubini & Corbett limit their "scullp" driver example to order 0. There is a bit of arm waving in the text (page 392) about some manipulation of page counts being required when the order is > 0. Could someone please elaborate what the rules are (for the "nopage" callback)? [The DEBUG_LRU_PAGE() at line 206 of page_alloc.c disapproves of my attempts to date.] Is there any driver out there that solves this particular problem? Doug Gilbert - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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