On Fri, Jan 30, 2015 at 05:20:47PM +0800, Qu Wenruo wrote: > v5: > Add ACCESS_ONE() macro to avoid aggressive compiler optimization to > not read fs_info->mount_opt to new_opt but always use fs_info->mount_opt. This holds only up to this patch, ie. that there are other threads that could change value of fs_info->mount_opt concurrently. But then the per-transaction mount options will avoid that as space cache status will be unmodified by remounts (through parse_options). So either drop ACCESS_ONCE or please write a comment and explain why it's still needed. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
