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VM: add "vm_mmap()" helper function

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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>
This commit is contained in:
Linus Torvalds
2012-04-20 17:13:58 -07:00
parent a46ef99d80
commit 6be5ceb02e
15 changed files with 87 additions and 97 deletions
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4
drivers/gpu/drm/exynos/exynos_drm_gem.c
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@@ -581,10 +581,8 @@ int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data,
obj->filp->f_op = &exynos_drm_gem_fops;
obj->filp->private_data = obj;
down_write(&current->mm->mmap_sem);
addr = do_mmap(obj->filp, 0, args->size,
addr = vm_mmap(obj->filp, 0, args->size,
PROT_READ | PROT_WRITE, MAP_SHARED, 0);
up_write(&current->mm->mmap_sem);
drm_gem_object_unreference_unlocked(obj);