The patch titled Subject: mempolicy: kill do_set_mempolicy()->down_write(&mm->mmap_sem) has been added to the -mm tree. Its filename is mempolicy-kill-do_set_mempolicy-down_writemm-mmap_sem.patch This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/mempolicy-kill-do_set_mempolicy-down_writemm-mmap_sem.patch and later at http://ozlabs.org/~akpm/mmotm/broken-out/mempolicy-kill-do_set_mempolicy-down_writemm-mmap_sem.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Oleg Nesterov <oleg@xxxxxxxxxx> Subject: mempolicy: kill do_set_mempolicy()->down_write(&mm->mmap_sem) Remove down_write(&mm->mmap_sem) in do_set_mempolicy(). This logic was never correct and it is no longer needed, see the previous patch. Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> Cc: David Rientjes <rientjes@xxxxxxxxxx> Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx> Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx> Cc: Cyrill Gorcunov <gorcunov@xxxxxxxxxx> Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx> Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Hugh Dickins <hughd@xxxxxxxxxx> Cc: Andi Kleen <andi@xxxxxxxxxxxxxx> Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/mempolicy.c | 15 +-------------- 1 file changed, 1 insertion(+), 14 deletions(-) diff -puN mm/mempolicy.c~mempolicy-kill-do_set_mempolicy-down_writemm-mmap_sem mm/mempolicy.c --- a/mm/mempolicy.c~mempolicy-kill-do_set_mempolicy-down_writemm-mmap_sem +++ a/mm/mempolicy.c @@ -802,7 +802,6 @@ static long do_set_mempolicy(unsigned sh nodemask_t *nodes) { struct mempolicy *new, *old; - struct mm_struct *mm = current->mm; NODEMASK_SCRATCH(scratch); int ret; @@ -814,20 +813,11 @@ static long do_set_mempolicy(unsigned sh ret = PTR_ERR(new); goto out; } - /* - * prevent changing our mempolicy while show_numa_maps() - * is using it. - * Note: do_set_mempolicy() can be called at init time - * with no 'mm'. - */ - if (mm) - down_write(&mm->mmap_sem); + task_lock(current); ret = mpol_set_nodemask(new, nodes, scratch); if (ret) { task_unlock(current); - if (mm) - up_write(&mm->mmap_sem); mpol_put(new); goto out; } @@ -837,9 +827,6 @@ static long do_set_mempolicy(unsigned sh nodes_weight(new->v.nodes)) current->il_next = first_node(new->v.nodes); task_unlock(current); - if (mm) - up_write(&mm->mmap_sem); - mpol_put(old); ret = 0; out: _ Patches currently in -mm which might be from oleg@xxxxxxxxxx are prctl-pr_set_mm-introduce-pr_set_mm_map-operation-v4.patch mempolicy-change-alloc_pages_vma-to-use-mpol_cond_put.patch mempolicy-change-get_task_policy-to-return-default_policy-rather-than-null.patch mempolicy-sanitize-the-usage-of-get_task_policy.patch mempolicy-remove-the-task-arg-of-vma_policy_mof-and-simplify-it.patch mempolicy-introduce-__get_vma_policy-export-get_task_policy.patch mempolicy-fix-show_numa_map-vs-exec-do_set_mempolicy-race.patch mempolicy-kill-do_set_mempolicy-down_writemm-mmap_sem.patch mempolicy-unexport-get_vma_policy-and-remove-its-task-arg.patch earlyprintk-re-enable-earlyprintk-calling-early_param.patch fs-proc-task_mmuc-dont-use-task-mm-in-m_start-and-show_map.patch fs-proc-task_mmuc-unify-simplify-do_maps_open-and-numa_maps_open.patch proc-introduce-proc_mem_open.patch fs-proc-task_mmuc-shift-mm_access-from-m_start-to-proc_maps_open.patch fs-proc-task_mmuc-shift-mm_access-from-m_start-to-proc_maps_open-checkpatch-fixes.patch fs-proc-task_mmuc-simplify-the-vma_stop-logic.patch fs-proc-task_mmuc-simplify-the-vma_stop-logic-checkpatch-fixes.patch fs-proc-task_mmuc-cleanup-the-tail_vma-horror-in-m_next.patch fs-proc-task_mmuc-shift-priv-task-=-null-from-m_start-to-m_stop.patch fs-proc-task_mmuc-kill-the-suboptimal-and-confusing-m-version-logic.patch fs-proc-task_mmuc-simplify-m_start-to-make-it-readable.patch fs-proc-task_mmuc-introduce-m_next_vma-helper.patch fs-proc-task_mmuc-reintroduce-m-version-logic.patch fs-proc-task_mmuc-update-m-version-in-the-main-loop-in-m_start.patch fs-proc-task_nommuc-change-maps_open-to-use-__seq_open_private.patch fs-proc-task_nommuc-shift-mm_access-from-m_start-to-proc_maps_open.patch fs-proc-task_nommuc-shift-mm_access-from-m_start-to-proc_maps_open-checkpatch-fixes.patch fs-proc-task_nommuc-dont-use-priv-task-mm.patch proc-maps-replace-proc_maps_private-pid-with-struct-inode-inode.patch proc-maps-make-vm_is_stack-logic-namespace-friendly.patch ipc-shm-kill-the-historical-wrong-mm-start_stack-check.patch linux-next.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html