linux-kernel - [PATCH] x86-64: add default case to emulate_vsyscall() to silence compiler warning

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Date:	Thu, 15 Sep 2011 09:38:15 +0100
From:	"Jan Beulich" <JBeulich@...e.com>
To:	<mingo@...e.hu>, <tglx@...utronix.de>, <hpa@...or.com>
Cc:	"Andy Lutomirski" <luto@....EDU>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86-64: add default case to emulate_vsyscall() to
	 silence compiler warning

... since the compiler can't possibly know that vsyscall_nr is limited
to three values, and hence 'ret' must appear possibly uninitialized to
it.

Signed-off-by: Jan Beulich <jbeulich@...ell.com>
Cc: Andy Lutomirski <luto@....edu>

---
 arch/x86/kernel/vsyscall_64.c |    3 +++
 1 file changed, 3 insertions(+)

--- 3.1-rc6/arch/x86/kernel/vsyscall_64.c
+++ 3.1-rc6-x86_64-emul-vsyscall/arch/x86/kernel/vsyscall_64.c
@@ -195,6 +195,9 @@ bool emulate_vsyscall(struct pt_regs *re
 				 (unsigned __user *)regs->si,
 				 0);
 		break;
+	default:
+		ret = -ENOSYS;
+		break;
 	}
 
 	if (ret == -EFAULT) {



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