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SubjectRe: [REGRESSION] "add a disk_uevent helper" breaks booting Andorid w/ dynamic partitions
Please try the patch below:

---
From 85943345b41ec04f5a9e92dfad85b0fb24e2d2eb Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Tue, 23 Feb 2021 07:28:22 +0100
Subject: block: don't skip empty device in in disk_uevent

Restore the previous behavior by using the correct flag for the whole device
("part0").

Fixes: 99dfc43ecbf6 ("block: use ->bi_bdev for bio based I/O accounting")
Reported-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
block/genhd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/genhd.c b/block/genhd.c
index dbb92e24ef65ed..fcc530164b5ab4 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -476,7 +476,7 @@ void disk_uevent(struct gendisk *disk, enum kobject_action action)
struct disk_part_iter piter;
struct block_device *part;

- disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
+ disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY_PART0);
while ((part = disk_part_iter_next(&piter)))
kobject_uevent(bdev_kobj(part), action);
disk_part_iter_exit(&piter);
--
2.29.2
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