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author | Linus Torvalds <torvalds@linux-foundation.org> | 2015-02-11 18:23:28 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-02-11 18:23:28 -0800 |
commit | 59d53737a8640482995fea13c6e2c0fd016115d6 (patch) | |
tree | 3423eb92315865d76cb8d488513bfef6ab9251d0 /virt/kvm | |
parent | d3f180ea1a44aecba1b0dab2a253428e77f906bf (diff) | |
parent | 8138a67a5557ffea3a21dfd6f037842d4e748513 (diff) | |
download | linux-stable-59d53737a8640482995fea13c6e2c0fd016115d6.tar.gz linux-stable-59d53737a8640482995fea13c6e2c0fd016115d6.tar.bz2 linux-stable-59d53737a8640482995fea13c6e2c0fd016115d6.zip |
Merge branch 'akpm' (patches from Andrew)
Merge second set of updates from Andrew Morton:
"More of MM"
* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (83 commits)
mm/nommu.c: fix arithmetic overflow in __vm_enough_memory()
mm/mmap.c: fix arithmetic overflow in __vm_enough_memory()
vmstat: Reduce time interval to stat update on idle cpu
mm/page_owner.c: remove unnecessary stack_trace field
Documentation/filesystems/proc.txt: describe /proc/<pid>/map_files
mm: incorporate read-only pages into transparent huge pages
vmstat: do not use deferrable delayed work for vmstat_update
mm: more aggressive page stealing for UNMOVABLE allocations
mm: always steal split buddies in fallback allocations
mm: when stealing freepages, also take pages created by splitting buddy page
mincore: apply page table walker on do_mincore()
mm: /proc/pid/clear_refs: avoid split_huge_page()
mm: pagewalk: fix misbehavior of walk_page_range for vma(VM_PFNMAP)
mempolicy: apply page table walker on queue_pages_range()
arch/powerpc/mm/subpage-prot.c: use walk->vma and walk_page_vma()
memcg: cleanup preparation for page table walk
numa_maps: remove numa_maps->vma
numa_maps: fix typo in gather_hugetbl_stats
pagemap: use walk->vma instead of calling find_vma()
clear_refs: remove clear_refs_private->vma and introduce clear_refs_test_walk()
...
Diffstat (limited to 'virt/kvm')
-rw-r--r-- | virt/kvm/async_pf.c | 2 | ||||
-rw-r--r-- | virt/kvm/kvm_main.c | 50 |
2 files changed, 5 insertions, 47 deletions
diff --git a/virt/kvm/async_pf.c b/virt/kvm/async_pf.c index 5ff7f7f2689a..44660aee335f 100644 --- a/virt/kvm/async_pf.c +++ b/virt/kvm/async_pf.c @@ -80,7 +80,7 @@ static void async_pf_execute(struct work_struct *work) might_sleep(); - kvm_get_user_page_io(NULL, mm, addr, 1, NULL); + get_user_pages_unlocked(NULL, mm, addr, 1, 1, 0, NULL); kvm_async_page_present_sync(vcpu, apf); spin_lock(&vcpu->async_pf.lock); diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 1cc6e2e19982..458b9b14b15c 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -1128,43 +1128,6 @@ static int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm, return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL); } -int kvm_get_user_page_io(struct task_struct *tsk, struct mm_struct *mm, - unsigned long addr, bool write_fault, - struct page **pagep) -{ - int npages; - int locked = 1; - int flags = FOLL_TOUCH | FOLL_HWPOISON | - (pagep ? FOLL_GET : 0) | - (write_fault ? FOLL_WRITE : 0); - - /* - * If retrying the fault, we get here *not* having allowed the filemap - * to wait on the page lock. We should now allow waiting on the IO with - * the mmap semaphore released. - */ - down_read(&mm->mmap_sem); - npages = __get_user_pages(tsk, mm, addr, 1, flags, pagep, NULL, - &locked); - if (!locked) { - VM_BUG_ON(npages); - - if (!pagep) - return 0; - - /* - * The previous call has now waited on the IO. Now we can - * retry and complete. Pass TRIED to ensure we do not re - * schedule async IO (see e.g. filemap_fault). - */ - down_read(&mm->mmap_sem); - npages = __get_user_pages(tsk, mm, addr, 1, flags | FOLL_TRIED, - pagep, NULL, NULL); - } - up_read(&mm->mmap_sem); - return npages; -} - static inline int check_user_page_hwpoison(unsigned long addr) { int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE; @@ -1227,15 +1190,10 @@ static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault, npages = get_user_page_nowait(current, current->mm, addr, write_fault, page); up_read(¤t->mm->mmap_sem); - } else { - /* - * By now we have tried gup_fast, and possibly async_pf, and we - * are certainly not atomic. Time to retry the gup, allowing - * mmap semaphore to be relinquished in the case of IO. - */ - npages = kvm_get_user_page_io(current, current->mm, addr, - write_fault, page); - } + } else + npages = __get_user_pages_unlocked(current, current->mm, addr, 1, + write_fault, 0, page, + FOLL_TOUCH|FOLL_HWPOISON); if (npages != 1) return npages; |