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Message-ID: <6B24EEDBA38D764293B27C04FE414CC64E4091DE4E@G1W0491.americas.hpqcorp.net> Date: Mon, 30 Jun 2008 19:32:41 +0000 From: "Pan, Weimin" <weimin.pan@...com> To: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Why get_user_pages fails? I booted the kernel and set "mem=512M" and then mmapped the physical memory above 512M to user space and got the user space virtual address for that memory. When I passed that address to my driver to do direct IO. The get_user_pages() in my driver fails. I found that this is due to the VM_IO and VM_PFNMAP are set. Does that mean the page structures are not built when I mmapped physical memory to user space (using remap_pfn_range())? Do I have a way to solve this problem? How can I map the physical memory to user space virtual address and can pass this address to my driver to do direct IO by using get_user_pages() function? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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