linux-kernel - [PATCH] mm/hmm: add ARCH_HAS_HMM_MIRROR ARCH_HAS_HMM

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Date:   Wed, 17 Apr 2019 17:11:41 -0400
From:   jglisse@...hat.com
To:     linux-mm@...ck.org
Cc:     linux-kernel@...r.kernel.org,
        Jérôme Glisse <jglisse@...hat.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Leon Romanovsky <leonro@...lanox.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ralph Campbell <rcampbell@...dia.com>,
        John Hubbard <jhubbard@...dia.com>
Subject: [PATCH] mm/hmm: add ARCH_HAS_HMM_MIRROR ARCH_HAS_HMM_DEVICE Kconfig

From: Jérôme Glisse <jglisse@...hat.com>

This patch just add 2 new Kconfig that are _not use_ by anyone. I check
that various make ARCH=somearch allmodconfig do work and do not complain.
This new Kconfig need to be added first so that device driver that do
depend on HMM can be updated.

Once drivers are updated then i can update the HMM Kconfig to depends
on this new Kconfig in a followup patch.

Signed-off-by: Jérôme Glisse <jglisse@...hat.com>
Cc: Guenter Roeck <linux@...ck-us.net>
Cc: Leon Romanovsky <leonro@...lanox.com>
Cc: Jason Gunthorpe <jgg@...lanox.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Ralph Campbell <rcampbell@...dia.com>
Cc: John Hubbard <jhubbard@...dia.com>
---
 mm/Kconfig | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/mm/Kconfig b/mm/Kconfig
index 25c71eb8a7db..daadc9131087 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -676,6 +676,22 @@ 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
-- 
2.20.1