Subject: + mm-new_vma_page-cannot-see-null-vma-for-hugetlb-pages.patch added to -mm tree
To: mhocko@xxxxxxx,bob.liu@xxxxxxxxxx,liwanp@xxxxxxxxxxxxxxxxxx,n-horiguchi@xxxxxxxxxxxxx,sasha.levin@xxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Wed, 08 Jan 2014 12:49:19 -0800
The patch titled
Subject: mm: new_vma_page() cannot see NULL vma for hugetlb pages
has been added to the -mm tree. Its filename is
mm-new_vma_page-cannot-see-null-vma-for-hugetlb-pages.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-new_vma_page-cannot-see-null-vma-for-hugetlb-pages.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-new_vma_page-cannot-see-null-vma-for-hugetlb-pages.patch
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------------------------------------------------------
From: Michal Hocko <mhocko@xxxxxxx>
Subject: mm: new_vma_page() cannot see NULL vma for hugetlb pages
11c731e81bb0 ("mm/mempolicy: fix !vma in new_vma_page()") has removed
BUG_ON(!vma) from new_vma_page which is partially correct because
page_address_in_vma will return EFAULT for non-linear mappings and at
least shared shmem might be mapped this way.
The patch also tried to prevent NULL ptr for hugetlb pages which is not
correct AFAICS because hugetlb pages cannot be mapped as VM_NONLINEAR and
other conditions in page_address_in_vma seem to be legit and catch real
bugs.
This patch restores BUG_ON for PageHuge to catch potential issues when the
to-be-migrated page is not setup properly.
Signed-off-by: Michal Hocko <mhocko@xxxxxxx>
Reviewed-by: Bob Liu <bob.liu@xxxxxxxxxx>
Cc: Sasha Levin <sasha.levin@xxxxxxxxxx>
Cc: Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx>
Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mempolicy.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff -puN mm/mempolicy.c~mm-new_vma_page-cannot-see-null-vma-for-hugetlb-pages mm/mempolicy.c
--- a/mm/mempolicy.c~mm-new_vma_page-cannot-see-null-vma-for-hugetlb-pages
+++ a/mm/mempolicy.c
@@ -1199,10 +1199,8 @@ static struct page *new_vma_page(struct
}
if (PageHuge(page)) {
- if (vma)
- return alloc_huge_page_noerr(vma, address, 1);
- else
- return NULL;
+ BUG_ON(!vma);
+ return alloc_huge_page_noerr(vma, address, 1);
}
/*
* if !vma, alloc_page_vma() will use task or system default policy
_
Patches currently in -mm which might be from mhocko@xxxxxxx are
mm-mempolicy-remove-unneeded-functions-for-uma-configs.patch
mm-memblock-debug-correct-displaying-of-upper-memory-boundary.patch
memcg-fix-kmem_account_flags-check-in-memcg_can_account_kmem.patch
memcg-make-memcg_update_cache_sizes-static.patch
introduce-for_each_thread-to-replace-the-buggy-while_each_thread.patch
oom_kill-change-oom_killc-to-use-for_each_thread.patch
oom_kill-has_intersects_mems_allowed-needs-rcu_read_lock.patch
oom_kill-add-rcu_read_lock-into-find_lock_task_mm.patch
mm-page_alloc-allow-__gfp_nofail-to-allocate-below-watermarks-after-reclaim.patch
x86-memblock-set-current-limit-to-max-low-memory-address.patch
mm-memblock-debug-dont-free-reserved-array-if-arch_discard_memblock.patch
mm-bootmem-remove-duplicated-declaration-of-__free_pages_bootmem.patch
mm-memblock-remove-unnecessary-inclusions-of-bootmemh.patch
mm-memblock-drop-warn-and-use-smp_cache_bytes-as-a-default-alignment.patch
mm-memblock-reorder-parameters-of-memblock_find_in_range_node.patch
mm-memblock-switch-to-use-numa_no_node-instead-of-max_numnodes.patch
mm-memblock-add-memblock-memory-allocation-apis.patch
mm-memblock-add-memblock-memory-allocation-apis-fix.patch
mm-init-use-memblock-apis-for-early-memory-allocations.patch
mm-printk-use-memblock-apis-for-early-memory-allocations.patch
mm-page_alloc-use-memblock-apis-for-early-memory-allocations.patch
mm-power-use-memblock-apis-for-early-memory-allocations.patch
lib-swiotlbc-use-memblock-apis-for-early-memory-allocations.patch
lib-cpumaskc-use-memblock-apis-for-early-memory-allocations.patch
mm-sparse-use-memblock-apis-for-early-memory-allocations.patch
mm-hugetlb-use-memblock-apis-for-early-memory-allocations.patch
mm-page_cgroup-use-memblock-apis-for-early-memory-allocations.patch
mm-percpu-use-memblock-apis-for-early-memory-allocations.patch
mm-memory_hotplug-use-memblock-apis-for-early-memory-allocations.patch
drivers-firmware-memmapc-use-memblock-apis-for-early-memory-allocations.patch
arch-arm-kernel-use-memblock-apis-for-early-memory-allocations.patch
arch-arm-mm-initc-use-memblock-apis-for-early-memory-allocations.patch
arch-arm-mach-omap2-omap_hwmodc-use-memblock-apis-for-early-memory-allocations.patch
lib-show_memc-show-num_poisoned_pages-when-oom.patch
memcg-oom-lock-mem_cgroup_print_oom_info.patch
mm-page_alloc-warn-for-non-blockable-__gfp_nofail-allocation-failure.patch
memcg-do-not-use-vmalloc-for-mem_cgroup-allocations.patch
slab-clean-up-kmem_cache_create_memcg-error-handling.patch
memcg-slab-kmem_cache_create_memcg-fix-memleak-on-fail-path.patch
memcg-slab-clean-up-memcg-cache-initialization-destruction.patch
memcg-slab-fix-barrier-usage-when-accessing-memcg_caches.patch
memcg-fix-possible-null-deref-while-traversing-memcg_slab_caches-list.patch
memcg-slab-fix-races-in-per-memcg-cache-creation-destruction.patch
memcg-get-rid-of-kmem_cache_dup.patch
slab-do-not-panic-if-we-fail-to-create-memcg-cache.patch
memcg-slab-rcu-protect-memcg_params-for-root-caches.patch
memcg-remove-kmem_accounted_activated-flag.patch
memcg-rework-memcg_update_kmem_limit-synchronization.patch
mm-new_vma_page-cannot-see-null-vma-for-hugetlb-pages.patch
proc-fix-the-potential-use-after-free-in-first_tid.patch
proc-change-first_tid-to-use-while_each_thread-rather-than-next_thread.patch
proc-dont-abuse-group_leader-in-proc_task_readdir-paths.patch
proc-fix-f_pos-overflows-in-first_tid.patch
linux-next.patch
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