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When a work item is off-queue, its work->data contains WORK_STRUCT_*
and WORK_OFFQ_* flags. As WORK_OFFQ_* flags are used only while a
work item is off-queue, it can occupy bits of work->data which aren't
used while off-queue. WORK_OFFQ_* currently only use bits used by
on-queue CWQ pointer. As color bits aren't used while off-queue,
there's no reason to not use them.
Lower WORK_OFFQ_FLAG_BASE from WORK_STRUCT_FLAG_BITS to
WORK_STRUCT_COLOR_SHIFT thus giving 4 more bits to off-queue flag
space which is also used to record worker_pool ID while off-queue.
This doesn't introduce any visible behavior difference.
tj: Rewrote the description.
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
45d9550a0e