[PATCH 4.19.y RESEND] erofs: fix up erofs_lookup tracepoint

[Greg KH]

On Mon, Sep 27, 2021 at 01:29:54PM +0800, Gao Xiang wrote:
> commit 93368aab0efc87288cac65e99c9ed2e0ffc9e7d0 upstream.
> 
> Fix up a misuse that the filename pointer isn't always valid in
> the ring buffer, and we should copy the content instead.
> 
> Link: https://lore.kernel.org/r/20210921143531.81356-1-hsiangkao@linux.alibaba.com
> Fixes: 13f06f48f7bf ("staging: erofs: support tracepoint")
> Cc: stable at vger.kernel.org # 4.19+
> Reviewed-by: Chao Yu <chao at kernel.org>
> [ Gao Xiang: resolve trivial conflicts for 4.19.y. ]
> Signed-off-by: Gao Xiang <hsiangkao at linux.alibaba.com>
> ---
> add missing upstream commit id...

Now queued up, thanks.

greg k-h