linux-kernel - [PATCH -next] taint: fix debugfs_simple

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Date:   Fri, 28 Dec 2018 09:54:21 +0000
From:   YueHaibing <yuehaibing@...wei.com>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        "Borislav Petkov" <bp@...e.de>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>,
        "Petr Mladek" <pmladek@...e.com>
CC:     YueHaibing <yuehaibing@...wei.com>, <linux-kernel@...r.kernel.org>,
        <kernel-janitors@...r.kernel.org>
Subject: [PATCH -next] taint: fix debugfs_simple_attr.cocci warnings

Use DEFINE_DEBUGFS_ATTRIBUTE rather than DEFINE_SIMPLE_ATTRIBUTE
for debugfs files.

Semantic patch information:
Rationale: DEFINE_SIMPLE_ATTRIBUTE + debugfs_create_file()
imposes some significant overhead as compared to
DEFINE_DEBUGFS_ATTRIBUTE + debugfs_create_file_unsafe().

Generated by: scripts/coccinelle/api/debugfs/debugfs_simple_attr.cocci

Signed-off-by: YueHaibing <yuehaibing@...wei.com>
---
 kernel/panic.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/kernel/panic.c b/kernel/panic.c
index d10c340..d3d8a44 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -615,16 +615,14 @@ static int clear_warn_once_set(void *data, u64 val)
 	return 0;
 }
 
-DEFINE_SIMPLE_ATTRIBUTE(clear_warn_once_fops,
-			NULL,
-			clear_warn_once_set,
-			"%lld\n");
+DEFINE_DEBUGFS_ATTRIBUTE(clear_warn_once_fops, NULL, clear_warn_once_set,
+			 "%lld\n");
 
 static __init int register_warn_debugfs(void)
 {
 	/* Don't care about failure */
-	debugfs_create_file("clear_warn_once", 0200, NULL,
-			    NULL, &clear_warn_once_fops);
+	debugfs_create_file_unsafe("clear_warn_once", 0200, NULL, NULL,
+				   &clear_warn_once_fops);
 	return 0;
 }