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Message-ID: <5451157-3818-4af5-fd2c-5d26a5d1dc53@google.com>
Date: Tue, 3 Oct 2023 02:21:34 -0700 (PDT)
From: Hugh Dickins <hughd@...gle.com>
To: Andrew Morton <akpm@...ux-foundation.org>
cc: Andi Kleen <ak@...ux.intel.com>, Christoph Lameter <cl@...ux.com>,
Matthew Wilcox <willy@...radead.org>,
Mike Kravetz <mike.kravetz@...cle.com>,
David Hildenbrand <david@...hat.com>,
Suren Baghdasaryan <surenb@...gle.com>,
Yang Shi <shy828301@...il.com>,
Sidhartha Kumar <sidhartha.kumar@...cle.com>,
Vishal Moola <vishal.moola@...il.com>,
Kefeng Wang <wangkefeng.wang@...wei.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Tejun Heo <tj@...nel.org>,
Mel Gorman <mgorman@...hsingularity.net>,
Michal Hocko <mhocko@...e.com>,
"Huang, Ying" <ying.huang@...el.com>, linux-kernel@...r.kernel.org,
linux-mm@...ck.org
Subject: [PATCH v2 06/12] mempolicy trivia: use pgoff_t in shared mempolicy
tree
Prefer the more explicit "pgoff_t" to "unsigned long" when dealing with
a shared mempolicy tree. Delete confusing comment about pseudo mm vmas.
Signed-off-by: Hugh Dickins <hughd@...gle.com>
---
include/linux/mempolicy.h | 20 +++++++-------------
mm/mempolicy.c | 12 ++++++------
2 files changed, 13 insertions(+), 19 deletions(-)
diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h
index 325b7200c311..c69f9480d5e4 100644
--- a/include/linux/mempolicy.h
+++ b/include/linux/mempolicy.h
@@ -107,22 +107,16 @@ static inline bool mpol_equal(struct mempolicy *a, struct mempolicy *b)
/*
* Tree of shared policies for a shared memory region.
- * Maintain the policies in a pseudo mm that contains vmas. The vmas
- * carry the policy. As a special twist the pseudo mm is indexed in pages, not
- * bytes, so that we can work with shared memory segments bigger than
- * unsigned long.
*/
-
-struct sp_node {
- struct rb_node nd;
- unsigned long start, end;
- struct mempolicy *policy;
-};
-
struct shared_policy {
struct rb_root root;
rwlock_t lock;
};
+struct sp_node {
+ struct rb_node nd;
+ pgoff_t start, end;
+ struct mempolicy *policy;
+};
int vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst);
void mpol_shared_policy_init(struct shared_policy *sp, struct mempolicy *mpol);
@@ -130,7 +124,7 @@ int mpol_set_shared_policy(struct shared_policy *sp,
struct vm_area_struct *vma, struct mempolicy *mpol);
void mpol_free_shared_policy(struct shared_policy *sp);
struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp,
- unsigned long idx);
+ pgoff_t idx);
struct mempolicy *get_task_policy(struct task_struct *p);
struct mempolicy *__get_vma_policy(struct vm_area_struct *vma,
@@ -216,7 +210,7 @@ static inline void mpol_free_shared_policy(struct shared_policy *sp)
}
static inline struct mempolicy *
-mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx)
+mpol_shared_policy_lookup(struct shared_policy *sp, pgoff_t idx)
{
return NULL;
}
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index c7906a034959..1d3f9e1ecbb8 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -2448,8 +2448,8 @@ bool __mpol_equal(struct mempolicy *a, struct mempolicy *b)
* lookup first element intersecting start-end. Caller holds sp->lock for
* reading or for writing
*/
-static struct sp_node *
-sp_lookup(struct shared_policy *sp, unsigned long start, unsigned long end)
+static struct sp_node *sp_lookup(struct shared_policy *sp,
+ pgoff_t start, pgoff_t end)
{
struct rb_node *n = sp->root.rb_node;
@@ -2503,8 +2503,8 @@ static void sp_insert(struct shared_policy *sp, struct sp_node *new)
}
/* Find shared policy intersecting idx */
-struct mempolicy *
-mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx)
+struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp,
+ pgoff_t idx)
{
struct mempolicy *pol = NULL;
struct sp_node *sn;
@@ -2672,8 +2672,8 @@ static struct sp_node *sp_alloc(unsigned long start, unsigned long end,
}
/* Replace a policy range. */
-static int shared_policy_replace(struct shared_policy *sp, unsigned long start,
- unsigned long end, struct sp_node *new)
+static int shared_policy_replace(struct shared_policy *sp, pgoff_t start,
+ pgoff_t end, struct sp_node *new)
{
struct sp_node *n;
struct sp_node *n_new = NULL;
--
2.35.3
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