linux-kernel - [PATCH 2/4] arm: dump: no need to check return value of debugfs

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Message-Id: <20190122144114.9816-3-gregkh@linuxfoundation.org>
Date:   Tue, 22 Jan 2019 15:41:12 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Catalin Marinas <catalin.marinas@....com>,
        Kevin Hilman <khilman@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Will Deacon <will.deacon@....com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jinbum Park <jinb.park7@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Laura Abbott <labbott@...hat.com>
Subject: [PATCH 2/4] arm: dump: no need to check return value of debugfs_create functions

When calling debugfs functions, there is no need to ever check the
return value.  The function can work or not, but the code logic should
never do something different based on this.

Cc: Russell King <linux@...linux.org.uk>
Cc: Jinbum Park <jinb.park7@...il.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Laura Abbott <labbott@...hat.com>
Cc: linux-arm-kernel@...ts.infradead.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/arm/include/asm/ptdump.h | 9 +++------
 arch/arm/mm/dump.c            | 4 ++--
 arch/arm/mm/ptdump_debugfs.c  | 8 ++------
 3 files changed, 7 insertions(+), 14 deletions(-)

diff --git a/arch/arm/include/asm/ptdump.h b/arch/arm/include/asm/ptdump.h
index 3ebf9718288d..0c2d3d0d4cc6 100644
--- a/arch/arm/include/asm/ptdump.h
+++ b/arch/arm/include/asm/ptdump.h
@@ -21,13 +21,10 @@ struct ptdump_info {
 
 void ptdump_walk_pgd(struct seq_file *s, struct ptdump_info *info);
 #ifdef CONFIG_ARM_PTDUMP_DEBUGFS
-int ptdump_debugfs_register(struct ptdump_info *info, const char *name);
+void ptdump_debugfs_register(struct ptdump_info *info, const char *name);
 #else
-static inline int ptdump_debugfs_register(struct ptdump_info *info,
-					const char *name)
-{
-	return 0;
-}
+static inline void ptdump_debugfs_register(struct ptdump_info *info,
+					   const char *name) { }
 #endif /* CONFIG_ARM_PTDUMP_DEBUGFS */
 
 void ptdump_check_wx(void);
diff --git a/arch/arm/mm/dump.c b/arch/arm/mm/dump.c
index 084779c5c893..eb385a500ed0 100644
--- a/arch/arm/mm/dump.c
+++ b/arch/arm/mm/dump.c
@@ -450,7 +450,7 @@ void ptdump_check_wx(void)
 static int ptdump_init(void)
 {
 	ptdump_initialize();
-	return ptdump_debugfs_register(&kernel_ptdump_info,
-					"kernel_page_tables");
+	ptdump_debugfs_register(&kernel_ptdump_info, "kernel_page_tables");
+	return 0;
 }
 __initcall(ptdump_init);
diff --git a/arch/arm/mm/ptdump_debugfs.c b/arch/arm/mm/ptdump_debugfs.c
index be8d87be4b93..598b636615a2 100644
--- a/arch/arm/mm/ptdump_debugfs.c
+++ b/arch/arm/mm/ptdump_debugfs.c
@@ -24,11 +24,7 @@ static const struct file_operations ptdump_fops = {
 	.release	= single_release,
 };
 
-int ptdump_debugfs_register(struct ptdump_info *info, const char *name)
+void ptdump_debugfs_register(struct ptdump_info *info, const char *name)
 {
-	struct dentry *pe;
-
-	pe = debugfs_create_file(name, 0400, NULL, info, &ptdump_fops);
-	return pe ? 0 : -ENOMEM;
-
+	debugfs_create_file(name, 0400, NULL, info, &ptdump_fops);
 }
-- 
2.20.1