CHECK: Concatenated strings should use spaces between elements
WARNING: From:/Signed-off-by: email address mismatch: 'From: Menglong Dong <menglong8.dong@gmail.com>' != 'Signed-off-by: Menglong Dong <dongml2@chinatelecom.cn>'
WARNING: line length of 90 exceeds 80 columns
WARNING: unnecessary whitespace before a quoted newline