linux-kernel - [tip:x86/asm] x86/prctl/uapi: Remove #ifdef for CHECKPOINT

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Message-ID: <tip-a01aa6c9f40fe03c82032e7f8b3bcf1e6c93ac0e@git.kernel.org>
Date:   Thu, 27 Oct 2016 23:48:55 -0700
From:   tip-bot for Dmitry Safonov <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mingo@...nel.org, brgerst@...il.com, gorcunov@...nvz.org,
        luto@...nel.org, linux-kernel@...r.kernel.org, hpa@...or.com,
        pebolle@...cali.nl, dsafonov@...tuozzo.com, peterz@...radead.org,
        dvlasenk@...hat.com, bp@...en8.de, jpoimboe@...hat.com,
        torvalds@...ux-foundation.org, tglx@...utronix.de
Subject: [tip:x86/asm] x86/prctl/uapi: Remove #ifdef for CHECKPOINT_RESTORE

Commit-ID:  a01aa6c9f40fe03c82032e7f8b3bcf1e6c93ac0e
Gitweb:     http://git.kernel.org/tip/a01aa6c9f40fe03c82032e7f8b3bcf1e6c93ac0e
Author:     Dmitry Safonov <dsafonov@...tuozzo.com>
AuthorDate: Thu, 27 Oct 2016 17:15:15 +0300
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 28 Oct 2016 08:15:55 +0200

x86/prctl/uapi: Remove #ifdef for CHECKPOINT_RESTORE

As userspace knows nothing about kernel config, thus #ifdefs
around ABI prctl constants makes them 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.

Reported-by: Paul Bolle <pebolle@...cali.nl>
Signed-off-by: Dmitry Safonov <dsafonov@...tuozzo.com>
Acked-by: Andy Lutomirski <luto@...nel.org>
Cc: 0x7f454c46@...il.com
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Cyrill Gorcunov <gorcunov@...nvz.org>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-mm@...ck.org
Cc: oleg@...hat.com
Fixes: 2eefd8789698 ("x86/arch_prctl/vdso: Add ARCH_MAP_VDSO_*")
Link: http://lkml.kernel.org/r/20161027141516.28447-2-dsafonov@virtuozzo.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 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 ae135de..835aa51 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 */