linux-kernel - [RFC PATCH 3/9] arm64: mm: migrate: add pmd swap entry to support thp migration.

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Message-Id: <20180426142804.180152-4-zi.yan@sent.com>
Date:   Thu, 26 Apr 2018 10:27:58 -0400
From:   Zi Yan <zi.yan@...t.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     Zi Yan <zi.yan@...rutgers.edu>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Steve Capper <steve.capper@....com>,
        Marc Zyngier <marc.zyngier@....com>,
        Kristina Martsenko <kristina.martsenko@....com>,
        Dan Williams <dan.j.williams@...el.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: [RFC PATCH 3/9] arm64: mm: migrate: add pmd swap entry to support thp migration.

From: Zi Yan <zi.yan@...rutgers.edu>

Signed-off-by: Zi Yan <zi.yan@...rutgers.edu>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will.deacon@....com>
Cc: Steve Capper <steve.capper@....com>
Cc: Marc Zyngier <marc.zyngier@....com>
Cc: Kristina Martsenko <kristina.martsenko@....com>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-mm@...ck.org
---
 arch/arm64/include/asm/pgtable.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 7e2c27e63cd8..1cdc9d3db2c7 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -742,7 +742,9 @@ extern pgd_t tramp_pg_dir[PTRS_PER_PGD];
 #define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) })
 
 #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
+#define __pmd_to_swp_entry(pmd)	((swp_entry_t) { pmd_val(pmd) })
 #define __swp_entry_to_pte(swp)	((pte_t) { (swp).val })
+#define __swp_entry_to_pmd(swp)	((pmd_t) { (swp).val })
 
 /*
  * Ensure that there are not more swap files than can be encoded in the kernel
-- 
2.17.0