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author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-04-20 17:13:58 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-04-20 17:29:13 -0700 |
commit | 6be5ceb02e98eaf6cfc4f8b12a896d04023f340d (patch) | |
tree | f34de1392300bbf63549f4eeb20f7606d6f7b1f9 /arch/x86/kvm/x86.c | |
parent | a46ef99d80817a167477ed1c8b4d90ee0c2e726f (diff) | |
download | op-kernel-dev-6be5ceb02e98eaf6cfc4f8b12a896d04023f340d.zip op-kernel-dev-6be5ceb02e98eaf6cfc4f8b12a896d04023f340d.tar.gz |
VM: add "vm_mmap()" helper function
This continues the theme started with vm_brk() and vm_munmap():
vm_mmap() does the same thing as do_mmap(), but additionally does the
required VM locking.
This uninlines (and rewrites it to be clearer) do_mmap(), which sadly
duplicates it in mm/mmap.c and mm/nommu.c. But that way we don't have
to export our internal do_mmap_pgoff() function.
Some day we hopefully don't have to export do_mmap() either, if all
modular users can become the simpler vm_mmap() instead. We're actually
very close to that already, with the notable exception of the (broken)
use in i810, and a couple of stragglers in binfmt_elf.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86/kvm/x86.c')
-rw-r--r-- | arch/x86/kvm/x86.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 8beb9ce..1457be30 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -6336,13 +6336,11 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm, if (npages && !old.rmap) { unsigned long userspace_addr; - down_write(¤t->mm->mmap_sem); - userspace_addr = do_mmap(NULL, 0, + userspace_addr = vm_mmap(NULL, 0, npages * PAGE_SIZE, PROT_READ | PROT_WRITE, map_flags, 0); - up_write(¤t->mm->mmap_sem); if (IS_ERR((void *)userspace_addr)) return PTR_ERR((void *)userspace_addr); |