linux-kernel - [PATCH v2 7/9] arm64: hugetlb: Override set_huge_swap_pte

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Message-Id: <20170405133722.6406-8-punit.agrawal@arm.com>
Date:   Wed,  5 Apr 2017 14:37:20 +0100
From:   Punit Agrawal <punit.agrawal@....com>
To:     catalin.marinas@....com, will.deacon@....com,
        akpm@...ux-foundation.org, mark.rutland@....com
Cc:     Punit Agrawal <punit.agrawal@....com>, linux-mm@...ck.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        tbaicar@...eaurora.org, kirill.shutemov@...ux.intel.com,
        mike.kravetz@...cle.com, hillf.zj@...baba-inc.com,
        steve.capper@....com, David Woods <dwoods@...lanox.com>
Subject: [PATCH v2 7/9] arm64: hugetlb: Override set_huge_swap_pte_at() to support contiguous hugepages

The default implementation of set_huge_swap_pte_at() does not support
hugepages consisting of contiguous ptes. Override it to add support for
contiguous hugepages.

Signed-off-by: Punit Agrawal <punit.agrawal@....com>
Cc: David Woods <dwoods@...lanox.com>
---
 arch/arm64/mm/hugetlbpage.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index 53bda26c6e8f..6d3857f41b8d 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -143,6 +143,23 @@ void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
 	}
 }
 
+void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
+			  pte_t *ptep, pte_t pte, unsigned long sz)
+{
+	size_t pgsize;
+	int i;
+	int ncontig;
+
+	if (sz == PUD_SIZE || sz == PMD_SIZE) {
+		set_pte(ptep, pte);
+		return;
+	}
+
+	ncontig = find_num_contig(mm, addr, ptep, &pgsize);
+	for (i = 0; i < ncontig; i++, ptep++)
+		set_pte(ptep, pte);
+}
+
 pte_t *huge_pte_alloc(struct mm_struct *mm,
 		      unsigned long addr, unsigned long sz)
 {
-- 
2.11.0