__ext4_warning
void __ext4_warning(struct super_block *, const char *, unsigned int,
__ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
__ext4_warning(sb, "", 0, " "); \
__ext4_warning(sb, function, line, "%s", msg);
__ext4_warning(sb, function, line,
__ext4_warning(inode->i_sb, func, line,