linux-kernel - [PATCH 2/3] x86,mm/pat: Cleanup some of the local memtype_rb

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Date:   Tue, 13 Aug 2019 15:46:19 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     mingo@...nel.org, tglx@...utronix.de
Cc:     walken@...gle.com, peterz@...radead.org, akpm@...ux-foundation.org,
        x86@...nel.org, linux-kernel@...r.kernel.org, dave@...olabs.net,
        Davidlohr Bueso <dbueso@...e.de>
Subject: [PATCH 2/3] x86,mm/pat: Cleanup some of the local memtype_rb_* calls

Cleanup by both getting rid of passing the rb_root down the helper
calls; there is only one. Secondly rename some of the calls from
memtype_rb_ to memtype_interval_.

Signed-off-by: Davidlohr Bueso <dbueso@...e.de>
---
 arch/x86/mm/pat_rbtree.c | 33 ++++++++++++++-------------------
 1 file changed, 14 insertions(+), 19 deletions(-)

diff --git a/arch/x86/mm/pat_rbtree.c b/arch/x86/mm/pat_rbtree.c
index 1be4d1856a9b..c87fa0e402db 100644
--- a/arch/x86/mm/pat_rbtree.c
+++ b/arch/x86/mm/pat_rbtree.c
@@ -55,12 +55,11 @@ static int is_node_overlap(struct memtype *node, u64 start, u64 end)
 	return 1;
 }
 
-static struct memtype *memtype_rb_lowest_match(struct rb_root_cached *root,
-						u64 start, u64 end)
+static struct memtype *memtype_interval_lowest_match(u64 start, u64 end)
 {
 	struct memtype *node;
 
-	node = memtype_interval_iter_first(root, start, end);
+	node = memtype_interval_iter_first(&memtype_rbroot, start, end);
 	while (node) {
 		if (is_node_overlap(node, start, end))
 			return node;
@@ -76,12 +75,12 @@ enum {
 	MEMTYPE_END_MATCH	= 1
 };
 
-static struct memtype *memtype_rb_match(struct rb_root_cached *root,
-					u64 start, u64 end, int match_type)
+static struct memtype *memtype_interval_match(u64 start, u64 end,
+					      int match_type)
 {
 	struct memtype *match;
 
-	match = memtype_rb_lowest_match(root, start, end);
+	match = memtype_interval_lowest_match(start, end);
 
 	while (match != NULL && match->start < end) {
 		if ((match_type == MEMTYPE_EXACT_MATCH) &&
@@ -98,15 +97,14 @@ static struct memtype *memtype_rb_match(struct rb_root_cached *root,
 	return NULL; /* Returns NULL if there is no match */
 }
 
-static int memtype_rb_check_conflict(struct rb_root_cached *root,
-				      u64 start, u64 end,
-				      enum page_cache_mode reqtype,
-				      enum page_cache_mode *newtype)
+static int memtype_interval_check_conflict(u64 start, u64 end,
+					   enum page_cache_mode reqtype,
+					   enum page_cache_mode *newtype)
 {
 	struct memtype *match;
 	enum page_cache_mode found_type = reqtype;
 
-	match = memtype_rb_lowest_match(root, start, end);
+	match = memtype_interval_lowest_match(start, end);
 	if (match == NULL)
 		goto success;
 
@@ -146,9 +144,8 @@ int rbt_memtype_check_insert(struct memtype *new,
 {
 	int err;
 
-	err =  memtype_rb_check_conflict(&memtype_rbroot,
-					 new->start, new->end,
-					 new->type, ret_type);
+	err =  memtype_interval_check_conflict(new->start, new->end,
+					       new->type, ret_type);
 	if (err)
 		return err;
 
@@ -170,11 +167,9 @@ struct memtype *rbt_memtype_erase(u64 start, u64 end)
 	 * it then checks with END_MATCH, i.e. shrink the size of a node
 	 * from the end for the mremap case.
 	 */
-	data = memtype_rb_match(&memtype_rbroot, start, end,
-				MEMTYPE_EXACT_MATCH);
+	data = memtype_interval_match(start, end, MEMTYPE_EXACT_MATCH);
 	if (!data) {
-		data = memtype_rb_match(&memtype_rbroot, start, end,
-					MEMTYPE_END_MATCH);
+		data = memtype_interval_match(start, end, MEMTYPE_END_MATCH);
 		if (!data)
 			return ERR_PTR(-EINVAL);
 	}
@@ -196,7 +191,7 @@ struct memtype *rbt_memtype_erase(u64 start, u64 end)
 
 struct memtype *rbt_memtype_lookup(u64 addr)
 {
-	return memtype_rb_lowest_match(&memtype_rbroot, addr, addr + PAGE_SIZE);
+	return memtype_interval_lowest_match(addr, addr + PAGE_SIZE);
 }
 
 #if defined(CONFIG_DEBUG_FS)
-- 
2.16.4