linux-kernel - [PATCH 1/2] x86/prctl/uapi: remove ifdef for CHECKPOINT

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Date:   Thu, 27 Oct 2016 17:15:15 +0300
From:   Dmitry Safonov <dsafonov@...tuozzo.com>
To:     <linux-kernel@...r.kernel.org>
CC:     Dmitry Safonov <dsafonov@...tuozzo.com>, <0x7f454c46@...il.com>,
        "Cyrill Gorcunov" <gorcunov@...nvz.org>,
        Paul Bolle <pebolle@...cali.nl>,
        "Andy Lutomirski" <luto@...nel.org>, <oleg@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, <linux-mm@...ck.org>,
        <x86@...nel.org>
Subject: [PATCH 1/2] x86/prctl/uapi: remove ifdef for CHECKPOINT_RESTORE

As userspace knows nothing about kernel config, this ifdefs
will make prctl constants invisible to userspace.
Let it be clean'n'simple: remove ifdefs.
If kernel has CONFIG_CHECKPOINT_RESTORE disabled, sys_prctl()
will return -EINVAL for those prctls.

Fixes: 2eefd8789698 ("x86/arch_prctl/vdso: Add ARCH_MAP_VDSO_*")
Cc: 0x7f454c46@...il.com
Cc: Cyrill Gorcunov <gorcunov@...nvz.org>
Cc: Paul Bolle <pebolle@...cali.nl>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: oleg@...hat.com
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: linux-mm@...ck.org
Cc: x86@...nel.org
Reported-by: Paul Bolle <pebolle@...cali.nl>
Signed-off-by: Dmitry Safonov <dsafonov@...tuozzo.com>
---
 arch/x86/include/uapi/asm/prctl.h | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/arch/x86/include/uapi/asm/prctl.h b/arch/x86/include/uapi/asm/prctl.h
index ae135de547f5..835aa51c7f6e 100644
--- a/arch/x86/include/uapi/asm/prctl.h
+++ b/arch/x86/include/uapi/asm/prctl.h
@@ -6,10 +6,8 @@
 #define ARCH_GET_FS 0x1003
 #define ARCH_GET_GS 0x1004
 
-#ifdef CONFIG_CHECKPOINT_RESTORE
-# define ARCH_MAP_VDSO_X32	0x2001
-# define ARCH_MAP_VDSO_32	0x2002
-# define ARCH_MAP_VDSO_64	0x2003
-#endif
+#define ARCH_MAP_VDSO_X32	0x2001
+#define ARCH_MAP_VDSO_32	0x2002
+#define ARCH_MAP_VDSO_64	0x2003
 
 #endif /* _ASM_X86_PRCTL_H */
-- 
2.10.1