Linux 4.19.178

Merge 244 patches from 4.19.178 stable
branch (248 total) beside 4 already merged patches:
7f1ba7ee94ad1 block: add helper for checking if queue is registered
fa137b50f3264 block: split .sysfs_lock into two locks
6c63a7be2b11b block: fix race between switching elevator and removing queues
ee3d84e67d013 block: don't release queue's sysfs lock during switching elevator
Tested-by: NJon Hunter <jonathanh@nvidia.com>
Tested-by: NPavel Machek (CIP) <pavel@denx.de>
Tested-by: NShuah Khan <skhan@linuxfoundation.org>
Tested-by: NHulk Robot <hulkci@huawei.com>
Tested-by: NLinux Kernel Functional Testing <lkft@linaro.org>
Tested-by: NGuenter Roeck <linux@roeck-us.net>
Tested-by: NJason Self <jason@bluehome.net>
Link: https://lore.kernel.org/r/20210301193544.489324430@linuxfoundation.org
Link: https://lore.kernel.org/r/20210302122300.309814713@linuxfoundation.org
Link: https://lore.kernel.org/r/20210301161031.684018251@linuxfoundation.org
Link: https://lore.kernel.org/r/20210302192550.512870321@linuxfoundation.orgSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

Makefile

 # SPDX-License-Identifier: GPL-2.0
 VERSION = 4
 PATCHLEVEL = 19
-SUBLEVEL = 177
+SUBLEVEL = 178
 EXTRAVERSION =
 NAME = "People's Front"