LKML Archive on
 help / color / Atom feed
From: Andi Kleen <>
Cc:, Andi Kleen <>,,,
Subject: [PATCH] perf/x86: Fix exclusion of BTS and LBR for Goldmont
Date: Thu,  8 Dec 2016 16:14:17 -0800
Message-ID: <> (raw)

From: Andi Kleen <>

An earlier patch allowed enabling PT and LBR at the same
time on Goldmont. However it also allowed enabling BTS and LBR
at the same time, which is still not supported. Fix this by
bypassing the check only for PT.

Marking for stable because this allows crashing kernels. Also
should be merged for 4.9.

Fixes: ccbebba4c6bf ("erf/x86/intel/pt: Bypass PT vs. LBR exclusivity if the core supports it")
Cc: <>
v2: Paint bike shed differently.
Signed-off-by: Andi Kleen <>
 arch/x86/events/core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index d0efb5cb1b00..baa1eed55e88 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -364,7 +364,7 @@ int x86_add_exclusive(unsigned int what)
 	int i;
-	if (x86_pmu.lbr_pt_coexist)
+	if (what == x86_lbr_exclusive_pt && x86_pmu.lbr_pt_coexist)
 		return 0;
 	if (!atomic_inc_not_zero(&x86_pmu.lbr_exclusive[what])) {
@@ -387,7 +387,7 @@ fail_unlock:
 void x86_del_exclusive(unsigned int what)
-	if (x86_pmu.lbr_pt_coexist)
+	if (what == x86_lbr_exclusive_pt && x86_pmu.lbr_pt_coexist)

             reply index

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-12-09  0:14 Andi Kleen [this message]
2016-12-09 15:49 ` Peter Zijlstra
2016-12-12  6:49 ` [tip:perf/core] " tip-bot for Andi Kleen
  -- strict thread matches above, loose matches on Subject: below --
2016-12-02 23:17 [PATCH] " Andi Kleen
2016-12-06 12:38 ` Peter Zijlstra
2016-12-06 14:53   ` Andi Kleen

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \ \ \ \ \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

LKML Archive on

Archives are clonable:
	git clone --mirror lkml/git/0.git
	git clone --mirror lkml/git/1.git
	git clone --mirror lkml/git/2.git
	git clone --mirror lkml/git/3.git
	git clone --mirror lkml/git/4.git
	git clone --mirror lkml/git/5.git
	git clone --mirror lkml/git/6.git
	git clone --mirror lkml/git/7.git
	git clone --mirror lkml/git/8.git
	git clone --mirror lkml/git/9.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ \
	public-inbox-index lkml

Example config snippet for mirrors

Newsgroup available over NNTP:

AGPL code for this site: git clone