From 83242c515881cc8642d726c3e648e41bf6c24551 Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@kernel.org>
Date: Wed, 27 May 2015 12:22:29 +0200
Subject: [PATCH] x86/fpu: Make WARN_ON_FPU() more robust in the
 !CONFIG_X86_DEBUG_FPU case

Make sure the WARN_ON_FPU() macro consumes the macro argument,
to avoid 'unused variable' build warnings if the only use of
a variable is in debugging code.

Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Bobby Powers <bobbypowers@gmail.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/include/asm/fpu/internal.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/fpu/internal.h b/arch/x86/include/asm/fpu/internal.h
index 9f3863872007..3c3550c3a4a3 100644
--- a/arch/x86/include/asm/fpu/internal.h
+++ b/arch/x86/include/asm/fpu/internal.h
@@ -49,7 +49,7 @@ extern void fpu__resume_cpu(void);
 #ifdef CONFIG_X86_DEBUG_FPU
 # define WARN_ON_FPU(x) WARN_ON_ONCE(x)
 #else
-# define WARN_ON_FPU(x) ({ 0; })
+# define WARN_ON_FPU(x) ({ (void)(x); 0; })
 #endif
 
 /*
-- 
2.20.1