linux-kernel - [PATCH v2 6/6] maple_tree: reorder mas->store

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20250221163610.578409-7-sidhartha.kumar@oracle.com>
Date: Fri, 21 Feb 2025 16:36:10 +0000
From: Sidhartha Kumar <sidhartha.kumar@...cle.com>
To: linux-kernel@...r.kernel.org, maple-tree@...ts.infradead.org
Cc: linux-mm@...ck.org, akpm@...ux-foundation.org, liam.howlett@...cle.com,
        richard.weiyang@...il.com,
        Sidhartha Kumar <sidhartha.kumar@...cle.com>
Subject: [PATCH v2 6/6] maple_tree: reorder mas->store_type case statements

Move the unlikely case that mas->store_type is invalid to be the last
evaluated case and put liklier cases higher up.

Suggested-by: Liam Howlett <liam.howlett@...cle.com>
Signed-off-by: Sidhartha <sidhartha.kumar@...cle.com>
---
 lib/maple_tree.c | 51 ++++++++++++++++++++++++------------------------
 1 file changed, 25 insertions(+), 26 deletions(-)

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index 8fdd3f477198..36d7d7a27e32 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -4091,15 +4091,6 @@ static inline void mas_wr_store_entry(struct ma_wr_state *wr_mas)
 	unsigned char new_end = mas_wr_new_end(wr_mas);
 
 	switch (mas->store_type) {
-	case wr_invalid:
-		MT_BUG_ON(mas->tree, 1);
-		return;
-	case wr_new_root:
-		mas_new_root(mas, wr_mas->entry);
-		break;
-	case wr_store_root:
-		mas_store_root(mas, wr_mas->entry);
-		break;
 	case wr_exact_fit:
 		rcu_assign_pointer(wr_mas->slots[mas->offset], wr_mas->entry);
 		if (!!wr_mas->entry ^ !!wr_mas->content)
@@ -4121,6 +4112,14 @@ static inline void mas_wr_store_entry(struct ma_wr_state *wr_mas)
 	case wr_rebalance:
 		mas_wr_bnode(wr_mas);
 		break;
+	case wr_new_root:
+		mas_new_root(mas, wr_mas->entry);
+		break;
+	case wr_store_root:
+		mas_store_root(mas, wr_mas->entry);
+		break;
+	case wr_invalid:
+		MT_BUG_ON(mas->tree, 1);
 	}
 
 	return;
@@ -4185,19 +4184,10 @@ static inline int mas_prealloc_calc(struct ma_wr_state *wr_mas, void *entry)
 	unsigned char delta = height - wr_mas->vacant_height;
 
 	switch (mas->store_type) {
-	case wr_invalid:
-		WARN_ON_ONCE(1);
-		break;
-	case wr_new_root:
-		ret = 1;
-		break;
-	case wr_store_root:
-		if (likely((mas->last != 0) || (mas->index != 0)))
-			ret = 1;
-		else if (((unsigned long) (entry) & 3) == 2)
-			ret = 1;
-		else
-			ret = 0;
+	case wr_exact_fit:
+	case wr_append:
+	case wr_slot_store:
+		ret = 0;
 		break;
 	case wr_spanning_store:
 		if (wr_mas->sufficient_height < wr_mas->vacant_height)
@@ -4217,10 +4207,19 @@ static inline int mas_prealloc_calc(struct ma_wr_state *wr_mas, void *entry)
 	case wr_node_store:
 		ret = mt_in_rcu(mas->tree) ? 1 : 0;
 		break;
-	case wr_append:
-	case wr_exact_fit:
-	case wr_slot_store:
-		ret = 0;
+	case wr_new_root:
+		ret = 1;
+		break;
+	case wr_store_root:
+		if (likely((mas->last != 0) || (mas->index != 0)))
+			ret = 1;
+		else if (((unsigned long) (entry) & 3) == 2)
+			ret = 1;
+		else
+			ret = 0;
+		break;
+	case wr_invalid:
+		WARN_ON_ONCE(1);
 	}
 
 	return ret;
-- 
2.43.0