linux-kernel - Re: [PATCH] staging/android: use multiple futex wait queues

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Date:   Fri, 15 Feb 2019 10:06:14 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Hugo Lefeuvre <hle@....eu.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org, Todd Kjos <tkjos@...roid.com>,
        Greg Hartman <ghartman@...gle.com>,
        Alistair Strachan <astrachan@...gle.com>,
        linux-kernel@...r.kernel.org,
        Arve Hjønnevåg <arve@...roid.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Martijn Coenen <maco@...roid.com>,
        Christian Brauner <christian@...uner.io>
Subject: Re: [PATCH] staging/android: use multiple futex wait queues

On Thu, Feb 14, 2019 at 06:34:59PM +0100, Hugo Lefeuvre wrote:
> @@ -402,6 +410,7 @@ static int handle_vsoc_cond_wait(struct file *filp, struct vsoc_cond_wait *arg)
>  	struct vsoc_region_data *data = vsoc_dev.regions_data + region_number;
>  	int ret = 0;
>  	struct vsoc_device_region *region_p = vsoc_region_from_filep(filp);
> +	struct vsoc_futex_wait_queue_t *it, *wait_queue = NULL;
                                             ^^^^^^^^^^^^^^^^^
>  	atomic_t *address = NULL;
>  	ktime_t wake_time;
>  
> @@ -415,10 +424,27 @@ static int handle_vsoc_cond_wait(struct file *filp, struct vsoc_cond_wait *arg)
>  	address = shm_off_to_virtual_addr(region_p->region_begin_offset +
>  					  arg->offset);
>  
> +	/* Find wait queue corresponding to offset or create it */
> +	spin_lock(&data->futex_wait_queue_lock);
> +	list_for_each_entry(it, &data->futex_wait_queue_list, list) {
> +		if (wait_queue->offset == arg->offset) {
                    ^^^^^^^^^^^^^^^^^^
You meant "it->offset".


> +			wait_queue = it;
> +			break;
> +		}
> +	}
> +
> +	if (!wait_queue) {
> +		wait_queue = kmalloc(sizeof(*wait_queue), GFP_KERNEL);
> +		wait_queue->offset = arg->offset;
> +		init_waitqueue_head(&wait_queue->queue);
> +		list_add(&wait_queue->list, &data->futex_wait_queue_list);
> +	}
> +	spin_unlock(&data->futex_wait_queue_lock);

regards,
dan carpenter