linux-kernel - [PATCH] x86/vdso: Add ARCH_MAP_VDSO_X32 if CONFIG_X86_X32

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Message-Id: <1474073513-6656-1-git-send-email-vlee@freedesktop.org>
Date:   Sat, 17 Sep 2016 00:51:53 +0000
From:   Vinson Lee <vlee@...edesktop.org>
To:     Dmitry Safonov <dsafonov@...tuozzo.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Andy Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...e.de>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Brian Gerst <brgerst@...il.com>
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] x86/vdso: Add ARCH_MAP_VDSO_X32 if CONFIG_X86_X32_ABI.

vdso_image_x32 is generated if CONFIG_X86_X32_ABI.

This patch fixes this build error on CentOS 6.8 with gcc 4.4.

  LD      init/built-in.o
arch/x86/built-in.o: In function `do_arch_prctl':
(.text+0x27466): undefined reference to `vdso_image_x32'
arch/x86/built-in.o: In function `do_arch_prctl':
(.text+0x27477): undefined reference to `vdso_image_x32'

Fixes: 2eefd8789698 ("x86/arch_prctl/vdso: Add ARCH_MAP_VDSO_*")
Signed-off-by: Vinson Lee <vlee@...edesktop.org>
---
 arch/x86/kernel/process_64.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index b34caea..b3760b3 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -592,7 +592,7 @@ long do_arch_prctl(struct task_struct *task, int code, unsigned long addr)
 	}
 
 #ifdef CONFIG_CHECKPOINT_RESTORE
-# ifdef CONFIG_X86_X32
+# ifdef CONFIG_X86_X32_ABI
 	case ARCH_MAP_VDSO_X32:
 		return prctl_map_vdso(&vdso_image_x32, addr);
 # endif
-- 
1.7.1