genirq: Use cpumask_available() for check of cpumask variable

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'
[-Werror,-Wpointer-bool-conversion]

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Cc: Grant Grundler <grundler@chromium.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Greg Hackmann <ghackmann@google.com>
Cc: Michael Davidson <md@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/20170412182030.83657-2-mka@chromium.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 098314b6a96633892fd8785049b2b3d2eaf92611..732efa3a116c8ca34e817b838be5ac1ae6110fdd 100644 (file)
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -836,7 +836,7 @@ irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action)
         * 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);
        else
                valid = false;