FAILED: Patch "LoongArch: Define the __io_aw() hook as mmiowb()" failed to apply to 4.19-stable tree

[Sasha Levin]

The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------