From: Jérôme Glisse Date: Tue, 14 May 2019 00:22:37 +0000 (-0700) Subject: mm/hmm: add ARCH_HAS_HMM_MIRROR ARCH_HAS_HMM_DEVICE Kconfig X-Git-Tag: v5.2-rc1~71^2~15 X-Git-Url: http://git.samba.org/samba.git/?p=sfrench%2Fcifs-2.6.git;a=commitdiff_plain;h=2c8fc3dcf2dc5cc06c30b63deada4237cd5bf8af mm/hmm: add ARCH_HAS_HMM_MIRROR ARCH_HAS_HMM_DEVICE Kconfig Add 2 new Kconfig variables that are not used by anyone. I check that various make ARCH=somearch allmodconfig do work and do not complain. This new Kconfig needs to be added first so that device drivers that depend on HMM can be updated. Once drivers are updated then I can update the HMM Kconfig to depend on this new Kconfig in a followup patch. This is about solving Kconfig for HMM given that device driver are going through their own tree we want to avoid changing them from the mm tree. So plan is: 1 - Kernel release N add the new Kconfig to mm/Kconfig (this patch) 2 - Kernel release N+1 update driver to depend on new Kconfig ie stop using ARCH_HASH_HMM and start using ARCH_HAS_HMM_MIRROR and ARCH_HAS_HMM_DEVICE (one or the other or both depending on the driver) 3 - Kernel release N+2 remove ARCH_HASH_HMM and do final Kconfig update in mm/Kconfig Link: http://lkml.kernel.org/r/20190417211141.17580-1-jglisse@redhat.com Signed-off-by: Jérôme Glisse Cc: Guenter Roeck Cc: Leon Romanovsky Cc: Jason Gunthorpe Cc: Ralph Campbell Cc: John Hubbard Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/mm/Kconfig b/mm/Kconfig index 4c2e6b63c064..71e697e693df 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -670,6 +670,22 @@ config ZONE_DEVICE If FS_DAX is enabled, then say Y. +config ARCH_HAS_HMM_MIRROR + bool + default y + depends on (X86_64 || PPC64) + depends on MMU && 64BIT + +config ARCH_HAS_HMM_DEVICE + bool + default y + depends on (X86_64 || PPC64) + depends on MEMORY_HOTPLUG + depends on MEMORY_HOTREMOVE + depends on SPARSEMEM_VMEMMAP + depends on ARCH_HAS_ZONE_DEVICE + select XARRAY_MULTI + config ARCH_HAS_HMM bool default y