linux-kernel - [PATCH 4.4 002/107] x86/MCE: Remove min interval polling limitation

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Date:   Mon, 23 Jul 2018 14:40:56 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dewet Thibaut <thibaut.dewet@...ia.com>,
        Alexander Sverdlin <alexander.sverdlin@...ia.com>,
        Borislav Petkov <bp@...e.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tony Luck <tony.luck@...el.com>,
        linux-edac <linux-edac@...r.kernel.org>
Subject: [PATCH 4.4 002/107] x86/MCE: Remove min interval polling limitation

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dewet Thibaut <thibaut.dewet@...ia.com>

commit fbdb328c6bae0a7c78d75734a738b66b86dffc96 upstream.

commit b3b7c4795c ("x86/MCE: Serialize sysfs changes") introduced a min
interval limitation when setting the check interval for polled MCEs.
However, the logic is that 0 disables polling for corrected MCEs, see
Documentation/x86/x86_64/machinecheck. The limitation prevents disabling.

Remove this limitation and allow the value 0 to disable polling again.

Fixes: b3b7c4795c ("x86/MCE: Serialize sysfs changes")
Signed-off-by: Dewet Thibaut <thibaut.dewet@...ia.com>
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@...ia.com>
[ Massage commit message. ]
Signed-off-by: Borislav Petkov <bp@...e.de>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Tony Luck <tony.luck@...el.com>
Cc: linux-edac <linux-edac@...r.kernel.org>
Cc: stable@...r.kernel.org
Link: http://lkml.kernel.org/r/20180716084927.24869-1-alexander.sverdlin@nokia.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/x86/kernel/cpu/mcheck/mce.c |    3 ---
 1 file changed, 3 deletions(-)

--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -2294,9 +2294,6 @@ static ssize_t store_int_with_restart(st
 	if (check_interval == old_check_interval)
 		return ret;

-	if (check_interval < 1)
-		check_interval = 1;
-
 	mutex_lock(&mce_sysfs_mutex);
 	mce_restart();
 	mutex_unlock(&mce_sysfs_mutex);