linux-kernel - [RFC V2 08/12] mm: Add new VMA flag VM

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Message-Id: <20170130033602.12275-9-khandual@linux.vnet.ibm.com>
Date:   Mon, 30 Jan 2017 09:05:49 +0530
From:   Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     mhocko@...e.com, vbabka@...e.cz, mgorman@...e.de,
        minchan@...nel.org, aneesh.kumar@...ux.vnet.ibm.com,
        bsingharora@...il.com, srikar@...ux.vnet.ibm.com,
        haren@...ux.vnet.ibm.com, jglisse@...hat.com,
        dave.hansen@...el.com, dan.j.williams@...el.com
Subject: [RFC V2 08/12] mm: Add new VMA flag VM_CDM

VMA which contains CDM memory pages should be marked with new VM_CDM flag.
These VMAs need to be identified in various core kernel paths for special
handling and this flag will help in their identification.

Signed-off-by: Anshuman Khandual <khandual@...ux.vnet.ibm.com>
---
 include/linux/mm.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index b84615b..82482d3 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -182,6 +182,11 @@ extern unsigned int kobjsize(const void *objp);
 #define VM_ACCOUNT	0x00100000	/* Is a VM accounted object */
 #define VM_NORESERVE	0x00200000	/* should the VM suppress accounting */
 #define VM_HUGETLB	0x00400000	/* Huge TLB Page VM */
+
+#ifdef CONFIG_COHERENT_DEVICE
+#define VM_CDM		0x00800000	/* Contains coherent device memory */
+#endif
+
 #define VM_ARCH_1	0x01000000	/* Architecture-specific flag */
 #define VM_ARCH_2	0x02000000
 #define VM_DONTDUMP	0x04000000	/* Do not include in the core dump */
-- 
2.9.3