[tip:x86/urgent] x86: vsyscall: Use NULL instead 0 for a pointer argument

[tip-bot for Emil Goode]

Commit-ID:  46ed99d1b7c92920ce9e313152522847647aae4f
Gitweb:     http://git.kernel.org/tip/46ed99d1b7c92920ce9e313152522847647aae4f
Author:     Emil Goode <emilgoode@xxxxxxxxx>
AuthorDate: Sun, 1 Apr 2012 20:48:04 +0200
Committer:  Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Fri, 6 Apr 2012 11:49:59 +0200

x86: vsyscall: Use NULL instead 0 for a pointer argument

This patch silences the following sparse warning:
arch/x86/kernel/vsyscall_64.c:250:34:
       warning: Using plain integer as NULL pointer

Signed-off-by: Emil Goode <emilgoode@xxxxxxxxx>
Acked-by: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: john.stultz@xxxxxxxxxx
Link: http://lkml.kernel.org/r/1333306084-3776-1-git-send-email-emilgoode@xxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
 arch/x86/kernel/vsyscall_64.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/vsyscall_64.c b/arch/x86/kernel/vsyscall_64.c
index f386dc4..7515cf0 100644
--- a/arch/x86/kernel/vsyscall_64.c
+++ b/arch/x86/kernel/vsyscall_64.c
@@ -216,9 +216,9 @@ bool emulate_vsyscall(struct pt_regs *regs, unsigned long address)
 	current_thread_info()->sig_on_uaccess_error = 1;
 
 	/*
-	 * 0 is a valid user pointer (in the access_ok sense) on 32-bit and
+	 * NULL is a valid user pointer (in the access_ok sense) on 32-bit and
 	 * 64-bit, so we don't need to special-case it here.  For all the
-	 * vsyscalls, 0 means "don't write anything" not "write it at
+	 * vsyscalls, NULL means "don't write anything" not "write it at
 	 * address 0".
 	 */
 	ret = -EFAULT;
@@ -247,7 +247,7 @@ bool emulate_vsyscall(struct pt_regs *regs, unsigned long address)
 
 		ret = sys_getcpu((unsigned __user *)regs->di,
 				 (unsigned __user *)regs->si,
-				 0);
+				 NULL);
 		break;
 	}
 
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