linux-kernel - [tip:x86/asm] x86/asm/entry/64: Fix MSR_IA32_SYSENTER

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Date:	Fri, 3 Apr 2015 07:07:09 -0700
From:	tip-bot for Borislav Petkov <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, bp@...e.de, rostedt@...dmis.org,
	linux-kernel@...r.kernel.org, luto@...capital.net,
	fweisbec@...il.com, oleg@...hat.com, dvlasenk@...hat.com,
	wad@...omium.org, ast@...mgrid.com, keescook@...omium.org,
	mingo@...nel.org, tglx@...utronix.de, hpa@...or.com
Subject: [tip:x86/asm] x86/asm/entry/64:
  Fix MSR_IA32_SYSENTER_CS MSR value

Commit-ID:  7c74d5b7b7b63fc279ed446ebd78de20d81f2824
Gitweb:     http://git.kernel.org/tip/7c74d5b7b7b63fc279ed446ebd78de20d81f2824
Author:     Borislav Petkov <bp@...e.de>
AuthorDate: Fri, 3 Apr 2015 11:42:10 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 3 Apr 2015 15:29:12 +0200

x86/asm/entry/64: Fix MSR_IA32_SYSENTER_CS MSR value

Commit:

  d56fe4bf5f3c ("x86/asm/entry/64: Always set up SYSENTER MSRs")

missed to add "ULL" to the 0 and wrmsrl_safe() complains:

  arch/x86/kernel/cpu/common.c: In function ‘syscall_init’:
  arch/x86/kernel/cpu/common.c:1226:2: warning: right shift count >= width of type wrmsrl_safe(MSR_IA32_SYSENTER_CS, 0);

Fix it.

Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: Alexei Starovoitov <ast@...mgrid.com>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Will Drewry <wad@...omium.org>
Link: http://lkml.kernel.org/r/1428054130-25847-1-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/cpu/common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index a383d53..d56d307 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1184,7 +1184,7 @@ void syscall_init(void)
 	wrmsrl_safe(MSR_IA32_SYSENTER_EIP, (u64)ia32_sysenter_target);
 #else
 	wrmsrl(MSR_CSTAR, ignore_sysret);
-	wrmsrl_safe(MSR_IA32_SYSENTER_CS, 0);
+	wrmsrl_safe(MSR_IA32_SYSENTER_CS, 0ULL);
 	wrmsrl_safe(MSR_IA32_SYSENTER_ESP, 0ULL);
 	wrmsrl_safe(MSR_IA32_SYSENTER_EIP, 0ULL);
 #endif
--
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