CHECK: struct mutex definition without comment
WARNING: ENOSYS means 'invalid syscall nr' and nothing else
WARNING: line length of 100 exceeds 80 columns
WARNING: line length of 81 exceeds 80 columns
WARNING: line length of 85 exceeds 80 columns
WARNING: line length of 87 exceeds 80 columns
WARNING: line length of 88 exceeds 80 columns
WARNING: line length of 92 exceeds 80 columns
WARNING: line length of 93 exceeds 80 columns