Hey Greg,
Marc was able to get me a backtrace for that bootup hang scenario that Pierre noted here [1]. A Tested-by is still pending, but I am certain this is the issue, and it may impact more than just the one platform if that "empty_attrs" pattern has been repeated anywhere else in the kernel.
I also took some time to document how to use the helpers a bit better, and introduce DEFINE_SIMPLE_SYSFS_GROUP_VISIBLE() for cases where all that matters is group visibility and not per attribute visibility.
[1]: http://lore.kernel.org/r/b93ec9c2-23f5-486b-a3dc-ed9b960df359@linux.intel.co...
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Dan Williams (3): sysfs: Fix crash on empty group attributes array sysfs: Document new "group visible" helpers sysfs: Introduce DEFINE_SIMPLE_SYSFS_GROUP_VISIBLE()
fs/sysfs/group.c | 4 +- include/linux/sysfs.h | 85 +++++++++++++++++++++++++++++++++++++++++++++++-- 2 files changed, 84 insertions(+), 5 deletions(-)
base-commit: 70317fd24b419091aa0a6dc3ea3ec7bb50c37c32