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


From: Matthias Kaehlcke <m...@chromium.org>

commit d170fe7dd992b313d4851ae5ab77ee7a51ed8c72 upstream.

This fixes the following clang warning when CONFIG_CPUMASK_OFFSTACK=n:

kernel/irq/manage.c:839:28: error: address of array
'desc->irq_common_data.affinity' will always evaluate to 'true'

Signed-off-by: Matthias Kaehlcke <m...@chromium.org>
Cc: Grant Grundler <grund...@chromium.org>
Cc: Rusty Russell <ru...@rustcorp.com.au>
Cc: Greg Hackmann <ghackm...@google.com>
Cc: Michael Davidson <m...@google.com>
Cc: Andrew Morton <a...@linux-foundation.org>
Link: http://lkml.kernel.org/r/20170412182030.83657-2-...@chromium.org
Signed-off-by: Thomas Gleixner <t...@linutronix.de>
Cc: Nathan Chancellor <natechancel...@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

 kernel/irq/manage.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -836,7 +836,7 @@ irq_thread_check_affinity(struct irq_des
         * This code is triggered unconditionally. Check the affinity
         * mask pointer. For CPU_MASK_OFFSTACK=n this is optimized out.
-       if (desc->irq_common_data.affinity)
+       if (cpumask_available(desc->irq_common_data.affinity))
                cpumask_copy(mask, desc->irq_common_data.affinity);
                valid = false;

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