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Re: [PATCH 60/78] zram: remove the claim mechanism
- To: Minchan Kim <minchan@xxxxxxxxxx>
- From: Christoph Hellwig <hch@xxxxxx>
- Date: Thu, 26 Nov 2020 10:59:48 +0100
- Cc: Christoph Hellwig <hch@xxxxxx>, Jens Axboe <axboe@xxxxxxxxx>, Justin Sanders <justin@xxxxxxxxxx>, Josef Bacik <josef@xxxxxxxxxxxxxx>, Ilya Dryomov <idryomov@xxxxxxxxx>, Jack Wang <jinpu.wang@xxxxxxxxxxxxxxx>, "Michael S. Tsirkin" <mst@xxxxxxxxxx>, Jason Wang <jasowang@xxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Stefan Hajnoczi <stefanha@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Mike Snitzer <snitzer@xxxxxxxxxx>, Song Liu <song@xxxxxxxxxx>, "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>, dm-devel@xxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, drbd-dev@xxxxxxxxxxxxxxxx, nbd@xxxxxxxxxxxxxxxx, ceph-devel@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-raid@xxxxxxxxxxxxxxx, linux-nvme@xxxxxxxxxxxxxxxxxxx, linux-scsi@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
- Delivery-date: Thu, 26 Nov 2020 09:59:59 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Wed, Nov 25, 2020 at 05:11:07PM -0800, Minchan Kim wrote:
> With this patch, how deal with the race?
>
> CPU 1 CPU 2
>
> hot_remove_store
> zram_remove
> zram_busy
> return -EBUSY
> open /dev/zram0
> del_gendisk
> zram_reset and destroy
Yeah, it looks like zram does not really handle hot unplugging unlike
other drivers. So I've dropped this one for now.
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