linux-kernel - [tip:x86/timers] x86/tsc_msr: Identify Intel-specific code

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Message-ID: <tip-ba8268330dc18d309a39175ea4d2c5d86c2cef09@git.kernel.org>
Date:	Sun, 10 Jul 2016 11:10:21 -0700
From:	tip-bot for Len Brown <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, peterz@...radead.org, hpa@...or.com,
	tglx@...utronix.de, len.brown@...el.com,
	linux-kernel@...r.kernel.org, mingo@...nel.org
Subject: [tip:x86/timers] x86/tsc_msr: Identify Intel-specific code

Commit-ID:  ba8268330dc18d309a39175ea4d2c5d86c2cef09
Gitweb:     http://git.kernel.org/tip/ba8268330dc18d309a39175ea4d2c5d86c2cef09
Author:     Len Brown <len.brown@...el.com>
AuthorDate: Fri, 17 Jun 2016 01:22:44 -0400
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Sun, 10 Jul 2016 17:00:12 +0200

x86/tsc_msr: Identify Intel-specific code

try_msr_calibrate_tsc() is currently Intel-specific,
and should not execute on any other vendor's parts.

Signed-off-by: Len Brown <len.brown@...el.com>
Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/1fe23c052826bdcfeb3d45045aa02246078cb5a7.1466138954.git.len.brown@intel.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/tsc_msr.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/kernel/tsc_msr.c b/arch/x86/kernel/tsc_msr.c
index 6aa0f4d..4ec5e56 100644
--- a/arch/x86/kernel/tsc_msr.c
+++ b/arch/x86/kernel/tsc_msr.c
@@ -86,6 +86,9 @@ unsigned long try_msr_calibrate_tsc(void)
 	unsigned long res;
 	int cpu_index;
 
+	if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
+		return 0;
+
 	cpu_index = match_cpu(boot_cpu_data.x86, boot_cpu_data.x86_model);
 	if (cpu_index < 0)
 		return 0;