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From: Daniel Jordan <daniel.m.jordan@oracle.com>
To: linux-mm@kvack.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: aarcange@redhat.com, aaron.lu@intel.com,
	akpm@linux-foundation.org, alex.williamson@redhat.com,
	bsd@redhat.com, daniel.m.jordan@oracle.com,
	darrick.wong@oracle.com, dave.hansen@linux.intel.com,
	jgg@mellanox.com, jwadams@google.com, jiangshanlai@gmail.com,
	mhocko@kernel.org, mike.kravetz@oracle.com,
	Pavel.Tatashin@microsoft.com, prasad.singamsetty@oracle.com,
	rdunlap@infradead.org, steven.sistare@oracle.com,
	tim.c.chen@intel.com, tj@kernel.org, vbabka@suse.cz
Subject: [RFC PATCH v4 10/13] mm: enlarge type of offset argument in mem_map_offset and mem_map_next
Date: Mon,  5 Nov 2018 11:55:55 -0500
Message-ID: <20181105165558.11698-11-daniel.m.jordan@oracle.com> (raw)
In-Reply-To: <20181105165558.11698-1-daniel.m.jordan@oracle.com>

Changes the type of 'offset' from int to unsigned long in both
mem_map_offset and mem_map_next.

This facilitates ktask's use of mem_map_next with its unsigned long
types to avoid silent truncation when these unsigned longs are passed as
ints.

It also fixes the preexisting truncation of 'offset' from unsigned long
to int by the sole caller of mem_map_offset, follow_hugetlb_page.

Signed-off-by: Daniel Jordan <daniel.m.jordan@oracle.com>
---
 mm/internal.h | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/mm/internal.h b/mm/internal.h
index 3b1ec1412fd2..cc90de4d4e01 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -367,7 +367,8 @@ static inline void mlock_migrate_page(struct page *new, struct page *old) { }
  * the maximally aligned gigantic page 'base'.  Handle any discontiguity
  * in the mem_map at MAX_ORDER_NR_PAGES boundaries.
  */
-static inline struct page *mem_map_offset(struct page *base, int offset)
+static inline struct page *mem_map_offset(struct page *base,
+					  unsigned long offset)
 {
 	if (unlikely(offset >= MAX_ORDER_NR_PAGES))
 		return nth_page(base, offset);
@@ -378,8 +379,8 @@ static inline struct page *mem_map_offset(struct page *base, int offset)
  * Iterator over all subpages within the maximally aligned gigantic
  * page 'base'.  Handle any discontiguity in the mem_map.
  */
-static inline struct page *mem_map_next(struct page *iter,
-						struct page *base, int offset)
+static inline struct page *mem_map_next(struct page *iter, struct page *base,
+					unsigned long offset)
 {
 	if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
 		unsigned long pfn = page_to_pfn(base) + offset;
-- 
2.19.1

  parent reply index

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-05 16:55 [RFC PATCH v4 00/13] ktask: multithread CPU-intensive kernel work Daniel Jordan
2018-11-05 16:55 ` [RFC PATCH v4 01/13] ktask: add documentation Daniel Jordan
2018-11-05 21:19   ` Randy Dunlap
2018-11-06  2:27     ` Daniel Jordan
2018-11-06  8:49   ` Peter Zijlstra
2018-11-06 20:34     ` Daniel Jordan
2018-11-06 20:51       ` Jason Gunthorpe
2018-11-07 10:27         ` Peter Zijlstra
2018-11-07 20:21           ` Daniel Jordan
2018-11-07 10:35       ` Peter Zijlstra
2018-11-07 21:20         ` Daniel Jordan
2018-11-08 17:26   ` Jonathan Corbet
2018-11-08 19:15     ` Daniel Jordan
2018-11-08 19:24       ` Jonathan Corbet
2018-11-27 19:50   ` Pavel Machek
2018-11-28 16:56     ` Daniel Jordan
2018-11-05 16:55 ` [RFC PATCH v4 02/13] ktask: multithread CPU-intensive kernel work Daniel Jordan
2018-11-05 20:51   ` Randy Dunlap
2018-11-06  2:24     ` Daniel Jordan
2018-11-05 16:55 ` [RFC PATCH v4 03/13] ktask: add undo support Daniel Jordan
2018-11-05 16:55 ` [RFC PATCH v4 04/13] ktask: run helper threads at MAX_NICE Daniel Jordan
2018-11-05 16:55 ` [RFC PATCH v4 05/13] workqueue, ktask: renice helper threads to prevent starvation Daniel Jordan
2018-11-13 16:34   ` Tejun Heo
2018-11-19 16:45     ` Daniel Jordan
2018-11-20 16:33       ` Tejun Heo
2018-11-20 17:03         ` Daniel Jordan
2018-11-05 16:55 ` [RFC PATCH v4 06/13] vfio: parallelize vfio_pin_map_dma Daniel Jordan
2018-11-05 21:51   ` Alex Williamson
2018-11-06  2:42     ` Daniel Jordan
2018-11-05 16:55 ` [RFC PATCH v4 07/13] mm: change locked_vm's type from unsigned long to atomic_long_t Daniel Jordan
2018-11-05 16:55 ` [RFC PATCH v4 08/13] vfio: remove unnecessary mmap_sem writer acquisition around locked_vm Daniel Jordan
2018-11-05 16:55 ` [RFC PATCH v4 09/13] vfio: relieve mmap_sem reader cacheline bouncing by holding it longer Daniel Jordan
2018-11-05 16:55 ` Daniel Jordan [this message]
2018-11-05 16:55 ` [RFC PATCH v4 11/13] mm: parallelize deferred struct page initialization within each node Daniel Jordan
2018-11-10  3:48   ` Elliott, Robert (Persistent Memory)
2018-11-12 16:54     ` Daniel Jordan
2018-11-12 22:15       ` Elliott, Robert (Persistent Memory)
2018-11-19 16:01         ` Daniel Jordan
2018-11-27  0:12           ` Elliott, Robert (Persistent Memory)
2018-11-27 20:23             ` Daniel Jordan
2018-11-19 16:29       ` Daniel Jordan
2018-11-05 16:55 ` [RFC PATCH v4 12/13] mm: parallelize clear_gigantic_page Daniel Jordan
2018-11-05 16:55 ` [RFC PATCH v4 13/13] hugetlbfs: parallelize hugetlbfs_fallocate with ktask Daniel Jordan
2018-11-05 17:29 ` [RFC PATCH v4 00/13] ktask: multithread CPU-intensive kernel work Michal Hocko
2018-11-06  1:29   ` Daniel Jordan
2018-11-06  9:21     ` Michal Hocko
2018-11-07 20:17       ` Daniel Jordan
2018-11-05 18:49 ` Zi Yan
2018-11-06  2:20   ` Daniel Jordan
2018-11-06  2:48     ` Zi Yan
2018-11-06 19:00       ` Daniel Jordan
2018-11-30 19:18 ` Tejun Heo
2018-12-01  0:13   ` Daniel Jordan
2018-12-03 16:16     ` Tejun Heo

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