Re: [PATCH] workqueue: WQ_NON_REENTRANT is meaningless and going away

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On Thu, Mar 27, 2014 at 09:41:47AM +0800, ZhangZhen wrote:
> Tejun Heo has  made WQ_NON_REENTRANT useless in the commit:dbf2576e37 ("workqueue: make all
> workqueues non-reentrant"). So remove its usages.
> 
> This patch doesn't introduce any behavior changes.
> 
> Signed-off-by: zhangzhen <zhenzhang.zhang@xxxxxxxxxx>

James, Chris, can you guys please ack this?  I think it'd be best to
route it through workqueue branch.

Thanks.

> ---
>  drivers/mmc/host/dw_mmc.c |    2 +-
>  include/linux/workqueue.h |    6 ------
>  net/l2tp/l2tp_core.c      |    2 +-
>  3 files changed, 2 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> index 55cd110..c204b7d 100644
> --- a/drivers/mmc/host/dw_mmc.c
> +++ b/drivers/mmc/host/dw_mmc.c
> @@ -2607,7 +2607,7 @@ int dw_mci_probe(struct dw_mci *host)
> 
>  	tasklet_init(&host->tasklet, dw_mci_tasklet_func, (unsigned long)host);
>  	host->card_workqueue = alloc_workqueue("dw-mci-card",
> -			WQ_MEM_RECLAIM | WQ_NON_REENTRANT, 1);
> +			WQ_MEM_RECLAIM, 1);
>  	if (!host->card_workqueue) {
>  		ret = -ENOMEM;
>  		goto err_dmaunmap;
> diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
> index 594521b..57b2687 100644
> --- a/include/linux/workqueue.h
> +++ b/include/linux/workqueue.h
> @@ -295,12 +295,6 @@ static inline unsigned int work_static(struct work_struct *work) { return 0; }
>   * Documentation/workqueue.txt.
>   */
>  enum {
> -	/*
> -	 * All wqs are now non-reentrant making the following flag
> -	 * meaningless.  Will be removed.
> -	 */
> -	WQ_NON_REENTRANT	= 1 << 0, /* DEPRECATED */
> -
>  	WQ_UNBOUND		= 1 << 1, /* not bound to any cpu */
>  	WQ_FREEZABLE		= 1 << 2, /* freeze during suspend */
>  	WQ_MEM_RECLAIM		= 1 << 3, /* may be used for memory reclaim */
> diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c
> index 735d0f6..fcbd63e 100644
> --- a/net/l2tp/l2tp_core.c
> +++ b/net/l2tp/l2tp_core.c
> @@ -2016,7 +2016,7 @@ static int __init l2tp_init(void)
>  	if (rc)
>  		goto out;
> 
> -	l2tp_wq = alloc_workqueue("l2tp", WQ_NON_REENTRANT | WQ_UNBOUND, 0);
> +	l2tp_wq = alloc_workqueue("l2tp", WQ_UNBOUND, 0);
>  	if (!l2tp_wq) {
>  		pr_err("alloc_workqueue failed\n");
>  		rc = -ENOMEM;

-- 
tejun
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