LKML Archive on
 help / color / Atom feed
From: Borislav Petkov <>
To: X86 ML <>
Cc: LKML <>
Subject: [PATCH] x86/apic: Make TSC deadline timer detection message visible
Date: Mon, 25 May 2020 12:42:18 +0200
Message-ID: <> (raw)

From: Borislav Petkov <>

The commit

  c84cb3735fd5 ("x86/apic: Move TSC deadline timer debug printk")

removed the message which said that the deadline timer was enabled.
It added a pr_debug() message which is issued when deadline timer
validation succeeds.

Well, issued only when CONFIG_DYNAMIC_DEBUG is enabled - otherwise
pr_debug() calls get optimized away if DEBUG is not defined in the
compilation unit.

Therefore, make the above message pr_info() so that it is visible in

Signed-off-by: Borislav Petkov <>
 arch/x86/kernel/apic/apic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 4b1d31be50b4..bf4acb0b5365 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -2060,7 +2060,7 @@ void __init init_apic_mappings(void)
 	unsigned int new_apicid;
 	if (apic_validate_deadline_timer())
-		pr_debug("TSC deadline timer available\n");
+		pr_info("TSC deadline timer available\n");
 	if (x2apic_mode) {
 		boot_cpu_physical_apicid = read_apic_id();

             reply index

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-25 10:42 Borislav Petkov [this message]
2020-05-26  9:28 ` [tip: x86/apic] " tip-bot2 for Borislav Petkov

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

	# 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