On Mon, 27 Jan 2014 18:03:04 +0800 Weijie Yang <weijie.y...@samsung.com> wrote:
> swapoff clear swap_info's SWP_USED flag prematurely and free its resources > after that. A concurrent swapon will reuse this swap_info while its previous > resources are not cleared completely. > > These late freed resources are: > - p->percpu_cluster > - swap_cgroup_ctrl[type] > - block_device setting > - inode->i_flags &= ~S_SWAPFILE > > This patch clear SWP_USED flag after all its resources freed, so that swapon > can reuse this swap_info by alloc_swap_info() safely. > > This patch is just for a rare scenario, aim to correct of code. I believe that http://ozlabs.org/~akpm/mmots/broken-out/mm-swap-fix-race-on-swap_info-reuse-between-swapoff-and-swapon.patch makes this patch redundant? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
