Messages in this thread | | | Date | Tue, 26 Oct 2021 23:55:43 -0700 | From | Christoph Hellwig <> | Subject | Re: [PATCH] dm: add module parameter bdev_wait |
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On Fri, Oct 22, 2021 at 02:47:47PM +0800, Mark-PK Tsai wrote: > dm_early_create() fail if the target block device not found in > the late init stage. > The block device is created in mmc_rescan() which kernel do > it async by queue it into system_freezable_wq. > Add module param bdev_wait to support waiting the block device > ready before dm_early_create() like prepare_namespace() does.
This adds a busy loop. There is a reason why we usually set up stacking drivers from userspace, in that we have a working event system there. So the answer is not to add further hacks to the in-kernel DM setup hack, but to stop using it.
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