hugetlbfs: correct handling of negative input to /proc/sys/vm/nr_hugepages
When the user inserts a negative value into /proc/sys/vm/nr_hugepages it will cause the kernel to allocate as many hugepages as possible and to then update /proc/meminfo to reflect this. This changes the behavior so that the negative input will result in nr_hugepages value being unchanged. Signed-off-by: NPetr Holasek <pholasek@redhat.com> Signed-off-by: NAnton Arapov <anton@redhat.com> Reviewed-by: NNaoya Horiguchi <n-horiguchi@ah.jp.nec.com> Acked-by: NDavid Rientjes <rientjes@google.com> Acked-by: NMel Gorman <mel@csn.ul.ie> Acked-by: NEric B Munson <emunson@mgebm.net> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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