Commit 931ac77e authored by Tejun Heo's avatar Tejun Heo
Browse files

workqueue: fix build problem on !CONFIG_SMP 



Commit f3421797 (workqueue: implement unbound workqueue) incorrectly
tested CONFIG_SMP as part of a C expression in alloc/free_cwqs().  As
CONFIG_SMP is not defined in UP, this breaks build.  Fix it by using

Found during linux-next build test.

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Reported-by: default avatarStephen Rothwell <sfr@canb.auug.org.au>
parent 9f9c2364

kernel/workqueue.c

+14 −4
Original line number Diff line number Diff line
@@ -2615,11 +2615,15 @@ static int alloc_cwqs(struct workqueue_struct *wq) 
	const size_t size = sizeof(struct cpu_workqueue_struct);

	const size_t align = max_t(size_t, 1 << WORK_STRUCT_FLAG_BITS,

				   __alignof__(unsigned long long));

#ifdef CONFIG_SMP

	bool percpu = !(wq->flags & WQ_UNBOUND);

#else

	bool percpu = false;

#endif



	if (CONFIG_SMP && !(wq->flags & WQ_UNBOUND)) {

		/* on SMP, percpu allocator can align itself */

	if (percpu)

		wq->cpu_wq.pcpu = __alloc_percpu(size, align);

	} else {

	else {

		void *ptr;



		/*
@@ -2641,7 +2645,13 @@ static int alloc_cwqs(struct workqueue_struct *wq) 


static void free_cwqs(struct workqueue_struct *wq)

{

	if (CONFIG_SMP && !(wq->flags & WQ_UNBOUND))

#ifdef CONFIG_SMP

	bool percpu = !(wq->flags & WQ_UNBOUND);

#else

	bool percpu = false;

#endif



	if (percpu)

		free_percpu(wq->cpu_wq.pcpu);

	else if (wq->cpu_wq.single) {

		/* the pointer to free is stored right after the cwq */

CRA Git | Maintained and supported by SUSTech CRA and CCSE