linux-kernel - [PATCH RT 1/2] genirq: Fix pointer cast warning for randomness on 32-bit architectures

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Message-ID: <20160929170041.GW10601@decadent.org.uk>
Date:   Thu, 29 Sep 2016 18:00:41 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kernel@...r.kernel.org, stable-rt@...r.kernel.org
Subject: [PATCH RT 1/2] genirq: Fix pointer cast warning for randomness on
 32-bit architectures

gcc warns about casting directly from a 32-bit pointer to u64.  In the
current rt patch series we cast to unsigned long to avoid the warning,
but this fix hasn't been backported to all versions.

Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
Cc: <stable-rt@...r.kernel.org> # 3.2
---
 kernel/irq/manage.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index c4677795d7c8..b1683ba80c88 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -897,7 +897,8 @@ static int irq_thread(void *data)
 #ifdef CONFIG_PREEMPT_RT_FULL
 			migrate_disable();
 			add_interrupt_randomness(action->irq, 0,
-						 desc->random_ip ^ (u64) action);
+						 desc->random_ip ^
+						 (unsigned long) action);
 			migrate_enable();
 #endif
 		}


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