linux-kernel - Re: [PATCH] x86/paravirt: hide unused patch

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Message-ID: <20161216095150.GQ3107@twins.programming.kicks-ass.net>
Date:   Fri, 16 Dec 2016 10:51:50 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/paravirt: hide unused patch_default label

On Fri, Dec 16, 2016 at 10:16:35AM +0100, Arnd Bergmann wrote:
> A bugfix introduced a harmless warning:
> 
> arch/x86/kernel/paravirt_patch_32.c: In function 'native_patch':
> arch/x86/kernel/paravirt_patch_32.c:71:1: error: label 'patch_default' defined but not used [-Werror=unused-label]
> 
> This puts it in the same #ifdef as its caller.
> 
> Fixes: 45dbea5f55c0 ("x86/paravirt: Fix native_patch()")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---

This seems to work as well and is less invasive


 arch/x86/kernel/paravirt_patch_32.c | 2 +-
 arch/x86/kernel/paravirt_patch_64.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/paravirt_patch_32.c b/arch/x86/kernel/paravirt_patch_32.c
index d33ef165b1f8..553acbbb4d32 100644
--- a/arch/x86/kernel/paravirt_patch_32.c
+++ b/arch/x86/kernel/paravirt_patch_32.c
@@ -68,7 +68,7 @@ unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
 #endif
 
 	default:
-patch_default:
+patch_default: __maybe_unused
 		ret = paravirt_patch_default(type, clobbers, ibuf, addr, len);
 		break;
 
diff --git a/arch/x86/kernel/paravirt_patch_64.c b/arch/x86/kernel/paravirt_patch_64.c
index f4fcf26c9fce..11aaf1eaa0e4 100644
--- a/arch/x86/kernel/paravirt_patch_64.c
+++ b/arch/x86/kernel/paravirt_patch_64.c
@@ -80,7 +80,7 @@ unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
 #endif
 
 	default:
-patch_default:
+patch_default: __maybe_unused
 		ret = paravirt_patch_default(type, clobbers, ibuf, addr, len);
 		break;