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Linux 3.11 compat: Replace num_physpages with totalram_pages
num_physpages was removed by torvalds/linux@cfa11e0, so lets replace it with totalram_pages. This is a bug fix as much as it is a compatibility fix because num_physpages did not reflect the number of pages actually available to the kernel: http://lkml.indiana.edu/hypermail/linux/kernel/0908.2/01001.html Also, there are known issues with memory calculations when ZFS is in a Xen dom0. There is a chance that using totalram_pages could resolve them. This conjecture is untested at the time of writing. Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes openzfs#273
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