From: Ingo Molnar <mingo@elte.hu>
Date: Wed, 10 Jun 2009 22:32:00 +0000 (+0200)
Subject: Revert "x86, bts: reenable ptrace branch trace support"
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=511b01bdf64ad8a38414096eab283c7784aebfc4;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

Revert "x86, bts: reenable ptrace branch trace support"

This reverts commit 7e0bfad24d85de7cf2202a7b0ce51de11a077b21.

A late objection to the ABI has arrived:

   http://lkml.org/lkml/2009/6/10/253

Keep the ABI disabled out of caution, to not create premature
user-space expectations.

While the hw-branch-tracing variant uses and tests the BTS code.

Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Markus Metzger <markus.t.metzger@intel.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
index 924e156a85ab..8130334329c0 100644
--- a/arch/x86/Kconfig.cpu
+++ b/arch/x86/Kconfig.cpu
@@ -506,6 +506,7 @@ config X86_PTRACE_BTS
 	bool "Branch Trace Store"
 	default y
 	depends on X86_DEBUGCTLMSR
+	depends on BROKEN
 	---help---
 	  This adds a ptrace interface to the hardware's branch trace store.