linux-kernel - [PATCH 1/1] x86/mm: Refine mmap syscall implementation

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Message-Id: <20201217052648.24656-1-adrianhuang0701@gmail.com>
Date:   Thu, 17 Dec 2020 13:26:48 +0800
From:   Adrian Huang <adrianhuang0701@...il.com>
To:     linux-kernel@...r.kernel.org, x86@...nel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Adrian Huang <adrianhuang0701@...il.com>,
        Adrian Huang <ahuang12@...ovo.com>
Subject: [PATCH 1/1] x86/mm: Refine mmap syscall implementation

From: Adrian Huang <ahuang12@...ovo.com>

It is unnecessary to use the local variable 'error' in the mmap
syscall implementation function, so use the return statement
instead of it.

Signed-off-by: Adrian Huang <ahuang12@...ovo.com>
---
 arch/x86/kernel/sys_x86_64.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/sys_x86_64.c b/arch/x86/kernel/sys_x86_64.c
index 504fa5425bce..660b78827638 100644
--- a/arch/x86/kernel/sys_x86_64.c
+++ b/arch/x86/kernel/sys_x86_64.c
@@ -90,14 +90,10 @@ SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
 		unsigned long, prot, unsigned long, flags,
 		unsigned long, fd, unsigned long, off)
 {
-	long error;
-	error = -EINVAL;
 	if (off & ~PAGE_MASK)
-		goto out;
+		return -EINVAL;
 
-	error = ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
-out:
-	return error;
+	return ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 }
 
 static void find_start_end(unsigned long addr, unsigned long flags,
-- 
2.17.1