linux-kernel - [PATCH] [v2] audit: avoid -Wempty-body warning

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Date:   Mon, 22 Mar 2021 17:27:45 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Paul Moore <paul@...l-moore.com>, Eric Paris <eparis@...hat.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Richard Guy Briggs <rgb@...hat.com>,
        Jules Irenge <jbi.octave@...il.com>, linux-audit@...hat.com,
        linux-kernel@...r.kernel.org
Subject: [PATCH] [v2] audit: avoid -Wempty-body warning

From: Arnd Bergmann <arnd@...db.de>

gcc warns about an empty statement when audit_remove_mark is defined to
nothing:

kernel/auditfilter.c: In function 'audit_data_to_entry':
kernel/auditfilter.c:609:51: error: suggest braces around empty body in an 'if' statement [-Werror=empty-body]
  609 |                 audit_remove_mark(entry->rule.exe); /* that's the template one */
      |                                                   ^

Change the macros to use the usual "do { } while (0)" instead, and change a
few more that were (void)0, for consistency.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
v2: convert two more macros
---
 kernel/audit.h | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/kernel/audit.h b/kernel/audit.h
index 3b9c0945225a..1522e100fd17 100644
--- a/kernel/audit.h
+++ b/kernel/audit.h
@@ -292,8 +292,8 @@ extern void audit_filter_inodes(struct task_struct *tsk,
 extern struct list_head *audit_killed_trees(void);
 #else /* CONFIG_AUDITSYSCALL */
 #define auditsc_get_stamp(c, t, s) 0
-#define audit_put_watch(w) {}
-#define audit_get_watch(w) {}
+#define audit_put_watch(w) do { } while (0)
+#define audit_get_watch(w) do { } while (0)
 #define audit_to_watch(k, p, l, o) (-EINVAL)
 #define audit_add_watch(k, l) (-EINVAL)
 #define audit_remove_watch_rule(k) BUG()
@@ -302,8 +302,8 @@ extern struct list_head *audit_killed_trees(void);
 
 #define audit_alloc_mark(k, p, l) (ERR_PTR(-EINVAL))
 #define audit_mark_path(m) ""
-#define audit_remove_mark(m)
-#define audit_remove_mark_rule(k)
+#define audit_remove_mark(m) do { } while (0)
+#define audit_remove_mark_rule(k) do { } while (0)
 #define audit_mark_compare(m, i, d) 0
 #define audit_exe_compare(t, m) (-EINVAL)
 #define audit_dupe_exe(n, o) (-EINVAL)
@@ -311,8 +311,8 @@ extern struct list_head *audit_killed_trees(void);
 #define audit_remove_tree_rule(rule) BUG()
 #define audit_add_tree_rule(rule) -EINVAL
 #define audit_make_tree(rule, str, op) -EINVAL
-#define audit_trim_trees() (void)0
-#define audit_put_tree(tree) (void)0
+#define audit_trim_trees() do { } while (0)
+#define audit_put_tree(tree) do { } while (0)
 #define audit_tag_tree(old, new) -EINVAL
 #define audit_tree_path(rule) ""	/* never called */
 #define audit_kill_trees(context) BUG()
-- 
2.29.2