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SubjectRe: [PATCH] module, async: async_synchronize_full() on module init iff async is used

> As Arjan suggested, trying to load the default modules right after the
> initial rootfs mount could be an acceptable compromise and it would be
> really nice (for both code sanity and avoiding future problems) to be
> able to declare module loading nested inside async unspported.

we can even try twice

the first time right after we mount the initramfs
the second time when the initramfs code exits, and before we exec init
(the initramfs supposedly mounted the real root fs at this point)

if you want your elevator to apply to your root filesystem storage, the rule
will then be "put the module in the initramfs"... but to be honest,
that's not a restriction that is unreasonable or unexpected.

for doing a module loading from inside an async handler..we can then just make
use of the normal "load this module async" way of requesting a module.

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