linux-kernel - [PATCH] cpuidle : fix random hangs with intel

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1331770181-800-1-git-send-email-daniel.lezcano@linaro.org>
Date:	Thu, 15 Mar 2012 01:09:41 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	sfr@...b.auug.org.au
Cc:	akpm@...ux-foundation.org, rob.lee@...aro.org, j-pihet@...com,
	khilman@...com, deepthi@...ux.vnet.ibm.com,
	dan.carpenter@...cle.com, linux-next@...r.kernel.org,
	linux-kernel@...r.kernel.org, hughd@...gle.com,
	amit.kucheria@...aro.org
Subject: [PATCH] cpuidle : fix random hangs with intel_idle

The cpuidle consolidation inverts the local_irq_enable for
the poll_idle function with CPU_RELAX.

Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Reported-by: Hugh Dickins <hughd@...gle.com>
---
 drivers/cpuidle/cpuidle.c |   21 +++++++++++++--------
 1 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index 56de5f7..4869b55 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -213,20 +213,25 @@ int cpuidle_wrap_enter(struct cpuidle_device *dev,
 }
 
 #ifdef CONFIG_ARCH_HAS_CPU_RELAX
-static inline int __poll_idle(struct cpuidle_device *dev,
+static int poll_idle(struct cpuidle_device *dev,
 		struct cpuidle_driver *drv, int index)
 {
+	ktime_t	t1, t2;
+	s64 diff;
+
+	t1 = ktime_get();
+	local_irq_enable();
 	while (!need_resched())
 		cpu_relax();
 
-	return index;
-}
+	t2 = ktime_get();
+	diff = ktime_to_us(ktime_sub(t2, t1));
+	if (diff > INT_MAX)
+		diff = INT_MAX;
 
-static int poll_idle(struct cpuidle_device *dev,
-		struct cpuidle_driver *drv, int index)
-{
-	return cpuidle_wrap_enter(dev,	drv, index,
-				__poll_idle);
+	dev->last_residency = (int) diff;
+
+	return index;
 }
 
 static void poll_idle_init(struct cpuidle_driver *drv)
-- 
1.7.5.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/