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-rw-r--r--include/linux/workqueue.h10
1 files changed, 9 insertions, 1 deletions
diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index ff68b1d95b41..f8b35763e55f 100644
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -73,13 +73,21 @@ enum {
WORK_OFFQ_CANCELING = (1 << WORK_OFFQ_FLAG_BASE),
+ /*
+ * When a work item is off queue, its high bits point to the last
+ * cpu it was on. Cap at 31 bits and use the highest number to
+ * indicate that no cpu is associated.
+ */
WORK_OFFQ_FLAG_BITS = 1,
WORK_OFFQ_CPU_SHIFT = WORK_OFFQ_FLAG_BASE + WORK_OFFQ_FLAG_BITS,
+ WORK_OFFQ_LEFT = BITS_PER_LONG - WORK_OFFQ_CPU_SHIFT,
+ WORK_OFFQ_CPU_BITS = WORK_OFFQ_LEFT <= 31 ? WORK_OFFQ_LEFT : 31,
+ WORK_OFFQ_CPU_NONE = (1LU << WORK_OFFQ_CPU_BITS) - 1,
/* convenience constants */
WORK_STRUCT_FLAG_MASK = (1UL << WORK_STRUCT_FLAG_BITS) - 1,
WORK_STRUCT_WQ_DATA_MASK = ~WORK_STRUCT_FLAG_MASK,
- WORK_STRUCT_NO_CPU = (unsigned long)WORK_CPU_NONE << WORK_OFFQ_CPU_SHIFT,
+ WORK_STRUCT_NO_CPU = (unsigned long)WORK_OFFQ_CPU_NONE << WORK_OFFQ_CPU_SHIFT,
/* bit mask for work_busy() return values */
WORK_BUSY_PENDING = 1 << 0,