From f702e1107601230eec707739038a89018ea3468d Mon Sep 17 00:00:00 2001
From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Date: Wed, 15 Dec 2021 20:13:55 +0900
Subject: [PATCH] tomoyo: use hwight16() in tomoyo_domain_quota_is_ok()
Git-commit: f702e1107601230eec707739038a89018ea3468d
Patch-mainline: v5.16-rc7
References: git-fixes

hwight16() is much faster. While we are at it, no need to include
"perm =" part into data_race() macro, for perm is a local variable
that cannot be accessed by other threads.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 security/tomoyo/util.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/security/tomoyo/util.c b/security/tomoyo/util.c
index af8cd2af3466..6799b1122c9d 100644
--- a/security/tomoyo/util.c
+++ b/security/tomoyo/util.c
@@ -1056,7 +1056,6 @@ bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r)
 	list_for_each_entry_rcu(ptr, &domain->acl_info_list, list,
 				srcu_read_lock_held(&tomoyo_ss)) {
 		u16 perm;
-		u8 i;
 
 		if (ptr->is_deleted)
 			continue;
@@ -1067,23 +1066,23 @@ bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r)
 		 */
 		switch (ptr->type) {
 		case TOMOYO_TYPE_PATH_ACL:
-			data_race(perm = container_of(ptr, struct tomoyo_path_acl, head)->perm);
+			perm = data_race(container_of(ptr, struct tomoyo_path_acl, head)->perm);
 			break;
 		case TOMOYO_TYPE_PATH2_ACL:
-			data_race(perm = container_of(ptr, struct tomoyo_path2_acl, head)->perm);
+			perm = data_race(container_of(ptr, struct tomoyo_path2_acl, head)->perm);
 			break;
 		case TOMOYO_TYPE_PATH_NUMBER_ACL:
-			data_race(perm = container_of(ptr, struct tomoyo_path_number_acl, head)
+			perm = data_race(container_of(ptr, struct tomoyo_path_number_acl, head)
 				  ->perm);
 			break;
 		case TOMOYO_TYPE_MKDEV_ACL:
-			data_race(perm = container_of(ptr, struct tomoyo_mkdev_acl, head)->perm);
+			perm = data_race(container_of(ptr, struct tomoyo_mkdev_acl, head)->perm);
 			break;
 		case TOMOYO_TYPE_INET_ACL:
-			data_race(perm = container_of(ptr, struct tomoyo_inet_acl, head)->perm);
+			perm = data_race(container_of(ptr, struct tomoyo_inet_acl, head)->perm);
 			break;
 		case TOMOYO_TYPE_UNIX_ACL:
-			data_race(perm = container_of(ptr, struct tomoyo_unix_acl, head)->perm);
+			perm = data_race(container_of(ptr, struct tomoyo_unix_acl, head)->perm);
 			break;
 		case TOMOYO_TYPE_MANUAL_TASK_ACL:
 			perm = 0;
@@ -1091,9 +1090,7 @@ bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r)
 		default:
 			perm = 1;
 		}
-		for (i = 0; i < 16; i++)
-			if (perm & (1 << i))
-				count++;
+		count += hweight16(perm);
 	}
 	if (count < tomoyo_profile(domain->ns, domain->profile)->
 	    pref[TOMOYO_PREF_MAX_LEARNING_ENTRY])
-- 
2.31.1