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Groups > linux.kernel > #1649490
| From | Laurent Dufour <ldufour@linux.vnet.ibm.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [RFC v2 02/10] mm: Remove nest locking operation with mmap_sem |
| Date | 2017-05-24 13:30 +0200 |
| Message-ID | <tKCEi-1Hm-25@gated-at.bofh.it> (permalink) |
| References | <tKCEh-1Hm-1@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
The range locking framework doesn't yet provide nest locking operation. Once the range locking API while provide nested operation support, this patch will have to be reviewed. Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com> --- mm/mmap.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/mm/mmap.c b/mm/mmap.c index f82741e199c0..87c8625ae91d 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -3284,7 +3284,11 @@ static void vm_lock_anon_vma(struct mm_struct *mm, struct anon_vma *anon_vma) * The LSB of head.next can't change from under us * because we hold the mm_all_locks_mutex. */ +#ifndef CONFIG_MEM_RANGE_LOCK down_write_nest_lock(&anon_vma->root->rwsem, &mm->mmap_sem); +#else + down_write(&anon_vma->root->rwsem); +#endif /* * We can safely modify head.next after taking the * anon_vma->root->rwsem. If some other vma in this mm shares @@ -3314,7 +3318,11 @@ static void vm_lock_mapping(struct mm_struct *mm, struct address_space *mapping) */ if (test_and_set_bit(AS_MM_ALL_LOCKS, &mapping->flags)) BUG(); +#ifndef CONFIG_MEM_RANGE_LOCK down_write_nest_lock(&mapping->i_mmap_rwsem, &mm->mmap_sem); +#else + down_write(&mapping->i_mmap_rwsem); +#endif } } -- 2.7.4
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[RFC v2 00/10] Replace mmap_sem by a range lock Laurent Dufour <ldufour@linux.vnet.ibm.com> - 2017-05-24 13:30 +0200 [RFC v2 06/10] mm: Add a range lock parameter to lock_page_or_retry() Laurent Dufour <ldufour@linux.vnet.ibm.com> - 2017-05-24 13:30 +0200 [RFC v2 03/10] mm: Add a range parameter to the vm_fault structure Laurent Dufour <ldufour@linux.vnet.ibm.com> - 2017-05-24 13:30 +0200 [RFC v2 02/10] mm: Remove nest locking operation with mmap_sem Laurent Dufour <ldufour@linux.vnet.ibm.com> - 2017-05-24 13:30 +0200 [RFC v2 04/10] mm: Handle range lock field when collapsing huge pages Laurent Dufour <ldufour@linux.vnet.ibm.com> - 2017-05-24 13:30 +0200 [RFC v2 08/10] mm: Define mem range lock operations Laurent Dufour <ldufour@linux.vnet.ibm.com> - 2017-05-24 13:30 +0200 [RFC v2 07/10] mm: Add a range lock parameter to GUP() and handle_page_fault() Laurent Dufour <ldufour@linux.vnet.ibm.com> - 2017-05-24 13:30 +0200 [RFC v2 05/10] mm: Add a range lock parameter to userfaultfd_remove() Laurent Dufour <ldufour@linux.vnet.ibm.com> - 2017-05-24 13:30 +0200 [RFC v2 01/10] mm: Deactivate mmap_sem assert Laurent Dufour <ldufour@linux.vnet.ibm.com> - 2017-05-24 13:30 +0200 [RFC v2 10/10] mm: Introduce CONFIG_MEM_RANGE_LOCK Laurent Dufour <ldufour@linux.vnet.ibm.com> - 2017-05-24 13:30 +0200
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