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authorTejun Heo <tj@kernel.org>2012-08-03 21:30:46 +0400
committerTejun Heo <tj@kernel.org>2012-08-03 21:30:46 +0400
commitb5490077274482efde57a50b060b99bc839acd45 (patch)
treedae1b67fa7b1c18d116fe97765bad1e52786e7aa /kernel/workqueue.c
parentbf4ede014ea886b71ef71368738da35b316cb7c0 (diff)
downloadlinux-b5490077274482efde57a50b060b99bc839acd45.tar.xz
workqueue: introduce WORK_OFFQ_FLAG_*
Low WORK_STRUCT_FLAG_BITS bits of work_struct->data contain WORK_STRUCT_FLAG_* and flush color. If the work item is queued, the rest point to the cpu_workqueue with WORK_STRUCT_CWQ set; otherwise, WORK_STRUCT_CWQ is clear and the bits contain the last CPU number - either a real CPU number or one of WORK_CPU_*. Scheduled addition of mod_delayed_work[_on]() requires an additional flag, which is used only while a work item is off queue. There are more than enough bits to represent off-queue CPU number on both 32 and 64bits. This patch introduces WORK_OFFQ_FLAG_* which occupy the lower part of the @work->data high bits while off queue. This patch doesn't define any actual OFFQ flag yet. Off-queue CPU number is now shifted by WORK_OFFQ_CPU_SHIFT, which adds the number of bits used by OFFQ flags to WORK_STRUCT_FLAG_SHIFT, to make room for OFFQ flags. To avoid shift width warning with large WORK_OFFQ_FLAG_BITS, ulong cast is added to WORK_STRUCT_NO_CPU and, just in case, BUILD_BUG_ON() to check that there are enough bits to accomodate off-queue CPU number is added. This patch doesn't make any functional difference. Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel/workqueue.c')
-rw-r--r--kernel/workqueue.c14
1 files changed, 9 insertions, 5 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 0f50f4078e36..eeae77079483 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -533,9 +533,9 @@ static int work_next_color(int color)
}
/*
- * A work's data points to the cwq with WORK_STRUCT_CWQ set while the
- * work is on queue. Once execution starts, WORK_STRUCT_CWQ is
- * cleared and the work data contains the cpu number it was last on.
+ * While queued, %WORK_STRUCT_CWQ is set and non flag bits of a work's data
+ * contain the pointer to the queued cwq. Once execution starts, the flag
+ * is cleared and the high bits contain OFFQ flags and CPU number.
*
* set_work_cwq(), set_work_cpu_and_clear_pending() and clear_work_data()
* can be used to set the cwq, cpu or clear work->data. These functions
@@ -565,7 +565,7 @@ static void set_work_cwq(struct work_struct *work,
static void set_work_cpu_and_clear_pending(struct work_struct *work,
unsigned int cpu)
{
- set_work_data(work, cpu << WORK_STRUCT_FLAG_BITS, 0);
+ set_work_data(work, (unsigned long)cpu << WORK_OFFQ_CPU_SHIFT, 0);
}
static void clear_work_data(struct work_struct *work)
@@ -592,7 +592,7 @@ static struct global_cwq *get_work_gcwq(struct work_struct *work)
return ((struct cpu_workqueue_struct *)
(data & WORK_STRUCT_WQ_DATA_MASK))->pool->gcwq;
- cpu = data >> WORK_STRUCT_FLAG_BITS;
+ cpu = data >> WORK_OFFQ_CPU_SHIFT;
if (cpu == WORK_CPU_NONE)
return NULL;
@@ -3724,6 +3724,10 @@ static int __init init_workqueues(void)
unsigned int cpu;
int i;
+ /* make sure we have enough bits for OFFQ CPU number */
+ BUILD_BUG_ON((1LU << (BITS_PER_LONG - WORK_OFFQ_CPU_SHIFT)) <
+ WORK_CPU_LAST);
+
cpu_notifier(workqueue_cpu_up_callback, CPU_PRI_WORKQUEUE_UP);
cpu_notifier(workqueue_cpu_down_callback, CPU_PRI_WORKQUEUE_DOWN);