[tip: ras/core] x86/mce: Lower throttling MCE messages' priority to warning

[tip-bot2 for Benjamin Berg]

The following commit has been merged into the ras/core branch of tip:

Commit-ID:     9c3bafaa1fd88e4dd2dba3735a1f1abb0f2c7bb7
Gitweb:        https://git.kernel.org/tip/9c3bafaa1fd88e4dd2dba3735a1f1abb0f2c7bb7
Author:        Benjamin Berg <bberg@xxxxxxxxxx>
AuthorDate:    Wed, 09 Oct 2019 17:54:24 +02:00
Committer:     Borislav Petkov <bp@xxxxxxx>
CommitterDate: Thu, 17 Oct 2019 09:07:09 +02:00

x86/mce: Lower throttling MCE messages' priority to warning

On modern CPUs it is quite normal that the temperature limits are
reached and the CPU is throttled. In fact, often the thermal design is
not sufficient to cool the CPU at full load and limits can quickly be
reached when a burst in load happens. This will even happen with
technologies like RAPL limitting the long term power consumption of
the package.

Also, these limits are "softer", as Srinivas explains:

"CPU temperature doesn't have to hit max(TjMax) to get these warnings.
OEMs ha[ve] an ability to program a threshold where a thermal interrupt
can be generated. In some systems the offset is 20C+ (Read only value).

In recent systems, there is another offset on top of it which can be
programmed by OS, once some agent can adjust power limits dynamically.
By default this is set to low by the firmware, which I guess the
prime motivation of Benjamin to submit the patch."

So these messages do not usually indicate a hardware issue (e.g.
insufficient cooling). Log them as warnings to avoid confusion about
their severity.

 [ bp: Massage commit mesage. ]

Signed-off-by: Benjamin Berg <bberg@xxxxxxxxxx>
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Tested-by: Christian Kellner <ckellner@xxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: linux-edac <linux-edac@xxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: x86-ml <x86@xxxxxxxxxx>
Link: https://lkml.kernel.org/r/20191009155424.249277-1-bberg@xxxxxxxxxx
---
 arch/x86/kernel/cpu/mce/therm_throt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/mce/therm_throt.c b/arch/x86/kernel/cpu/mce/therm_throt.c
index 6e2becf..bc441d6 100644
--- a/arch/x86/kernel/cpu/mce/therm_throt.c
+++ b/arch/x86/kernel/cpu/mce/therm_throt.c
@@ -188,7 +188,7 @@ static void therm_throt_process(bool new_event, int event, int level)
 	/* if we just entered the thermal event */
 	if (new_event) {
 		if (event == THERMAL_THROTTLING_EVENT)
-			pr_crit("CPU%d: %s temperature above threshold, cpu clock throttled (total events = %lu)\n",
+			pr_warn("CPU%d: %s temperature above threshold, cpu clock throttled (total events = %lu)\n",
 				this_cpu,
 				level == CORE_LEVEL ? "Core" : "Package",
 				state->count);