[PATCH v7 3/9] landlock: Optimize the number of calls to get_access_mask slightly

From: "Günther Noack" <gnoack@google.com>
To: linux-security-module@vger.kernel.org,
	"Mickaël Salaün" <mic@digikod.net>
Cc: "Jeff Xu" <jeffxu@google.com>,
	"Jorge Lucangeli Obes" <jorgelo@chromium.org>,
	"Allen Webb" <allenwebb@google.com>,
	"Dmitry Torokhov" <dtor@google.com>,
	"Paul Moore" <paul@paul-moore.com>,
	"Konstantin Meskhidze" <konstantin.meskhidze@huawei.com>,
	"Matt Bobrowski" <repnop@google.com>,
	linux-fsdevel@vger.kernel.org,
	"Günther Noack" <gnoack@google.com>
Subject: [PATCH v7 3/9] landlock: Optimize the number of calls to get_access_mask slightly
Date: Fri,  1 Dec 2023 15:30:36 +0100	[thread overview]
Message-ID: <20231201143042.3276833-4-gnoack@google.com> (raw)
In-Reply-To: <20231201143042.3276833-1-gnoack@google.com>

This call is now going through a function pointer,
and it is not as obvious any more that it will be inlined.

Signed-off-by: Günther Noack <gnoack@google.com>
---
 security/landlock/ruleset.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/security/landlock/ruleset.c b/security/landlock/ruleset.c
index 789c81b26a50..e0a5fbf9201a 100644
--- a/security/landlock/ruleset.c
+++ b/security/landlock/ruleset.c
@@ -723,11 +723,12 @@ landlock_init_layer_masks(const struct landlock_ruleset *const domain,
 	/* Saves all handled accesses per layer. */
 	for (layer_level = 0; layer_level < domain->num_layers; layer_level++) {
 		const unsigned long access_req = access_request;
+		const access_mask_t access_mask =
+			get_access_mask(domain, layer_level);
 		unsigned long access_bit;
 
 		for_each_set_bit(access_bit, &access_req, num_access) {
-			if (BIT_ULL(access_bit) &
-			    get_access_mask(domain, layer_level)) {
+			if (BIT_ULL(access_bit) & access_mask) {
 				(*layer_masks)[access_bit] |=
 					BIT_ULL(layer_level);
 				handled_accesses |= BIT_ULL(access_bit);
-- 
2.43.0.rc2.451.g8631bc7472-goog

