NeilBrown 750f199ee8 md: mark some attributes as pre-alloc ...

Since __ATTR_PREALLOC was introduced in v3.19-rc1~78^2~18
it can now be used by md.

This ensure that writing to these sysfs attributes will never
block due to a memory allocation.
Such blocking could become a deadlock if mdmon is trying to
reconfigure an array after a failure prior to re-enabling writes.

Signed-off-by: NeilBrown <neilb@suse.de>

2015-02-25 11:38:46 +11:00

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