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Introduce a new module parameter for dax_hmem which initializes all region devices as free, rather than allocating a pagemap for the region by default. All hmem devices created with dax_hmem.region_idle=1 will have full available size for creating dynamic dax devices. Signed-off-by: Joao Martins <[email protected]> Signed-off-by: Dan Williams <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Ard Biesheuvel <[email protected]> Cc: Ard Biesheuvel <[email protected]> Cc: Benjamin Herrenschmidt <[email protected]> Cc: Ben Skeggs <[email protected]> Cc: Bjorn Helgaas <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Boris Ostrovsky <[email protected]> Cc: Brice Goglin <[email protected]> Cc: Catalin Marinas <[email protected]> Cc: Daniel Vetter <[email protected]> Cc: Dave Hansen <[email protected]> Cc: Dave Jiang <[email protected]> Cc: David Airlie <[email protected]> Cc: David Hildenbrand <[email protected]> Cc: Greg Kroah-Hartman <[email protected]> Cc: "H. Peter Anvin" <[email protected]> Cc: Hulk Robot <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Ira Weiny <[email protected]> Cc: Jason Gunthorpe <[email protected]> Cc: Jason Yan <[email protected]> Cc: Jeff Moyer <[email protected]> Cc: "Jérôme Glisse" <[email protected]> Cc: Jia He <[email protected]> Cc: Jonathan Cameron <[email protected]> Cc: Juergen Gross <[email protected]> Cc: kernel test robot <[email protected]> Cc: Michael Ellerman <[email protected]> Cc: Mike Rapoport <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Pavel Tatashin <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: "Rafael J. Wysocki" <[email protected]> Cc: Randy Dunlap <[email protected]> Cc: Stefano Stabellini <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Tom Lendacky <[email protected]> Cc: Vishal Verma <[email protected]> Cc: Vivek Goyal <[email protected]> Cc: Wei Yang <[email protected]> Cc: Will Deacon <[email protected]> Link: https://lkml.kernel.org/r/159643106460.4062302.5868522341307530091.stgit@dwillia2-desk3.amr.corp.intel.com Link: https://lore.kernel.org/r/[email protected] Link: https://lkml.kernel.org/r/160106119033.30709.11249962152222193448.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Linus Torvalds <[email protected]>