linux-kernel - [PATCH 2/8] mincore: Add support for PUDs

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Message-Id: <1450974037-24775-3-git-send-email-matthew.r.wilcox@intel.com>
Date:	Thu, 24 Dec 2015 11:20:31 -0500
From:	Matthew Wilcox <matthew.r.wilcox@...el.com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	Matthew Wilcox <willy@...ux.intel.com>, linux-mm@...ck.org,
	linux-nvdimm@...ts.01.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, x86@...nel.org
Subject: [PATCH 2/8] mincore: Add support for PUDs

From: Matthew Wilcox <willy@...ux.intel.com>

We don't actually care about the contents of the PUD, just set the bits
to indicate presence and return.

Signed-off-by: Matthew Wilcox <willy@...ux.intel.com>
---
 mm/mincore.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/mm/mincore.c b/mm/mincore.c
index 2a565ed..8e6ce12 100644
--- a/mm/mincore.c
+++ b/mm/mincore.c
@@ -108,6 +108,18 @@ static int mincore_unmapped_range(unsigned long addr, unsigned long end,
 	return 0;
 }
 
+static int mincore_pud_range(pud_t *pud, unsigned long addr, unsigned long end,
+			struct mm_walk *walk)
+{
+	unsigned char *vec = walk->private;
+	int nr = (end - addr) >> PAGE_SHIFT;
+
+	memset(vec, 1, nr);
+	walk->private += nr;
+
+	return 0;
+}
+
 static int mincore_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
 			struct mm_walk *walk)
 {
@@ -176,6 +188,7 @@ static long do_mincore(unsigned long addr, unsigned long pages, unsigned char *v
 	unsigned long end;
 	int err;
 	struct mm_walk mincore_walk = {
+		.pud_entry = mincore_pud_range,
 		.pmd_entry = mincore_pte_range,
 		.pte_hole = mincore_unmapped_range,
 		.hugetlb_entry = mincore_hugetlb,
-- 
2.6.2

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