Re: [PATCH 1/4] mm: introduce vma_set_file function v2

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Am 08.10.20 um 13:39 schrieb Matthew Wilcox:
On Thu, Oct 08, 2020 at 01:23:39PM +0200, Christian König wrote:
  drivers/dma-buf/dma-buf.c                  | 16 +++++-----------
  drivers/gpu/drm/etnaviv/etnaviv_gem.c      |  4 +---
  drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c |  3 +--
  drivers/gpu/drm/i915/gem/i915_gem_mman.c   |  4 ++--
  drivers/gpu/drm/msm/msm_gem.c              |  4 +---
  drivers/gpu/drm/omapdrm/omap_gem.c         |  3 +--
  drivers/gpu/drm/vgem/vgem_drv.c            |  3 +--
  drivers/staging/android/ashmem.c           |  5 ++---
...
+++ b/mm/mmap.c
@@ -136,6 +136,22 @@ void vma_set_page_prot(struct vm_area_struct *vma)
  	WRITE_ONCE(vma->vm_page_prot, vm_page_prot);
  }
+/*
+ * Change backing file, only valid to use during initial VMA setup.
+ */
+struct file *vma_set_file(struct vm_area_struct *vma, struct file *file)
+{
+	if (file)
+	        get_file(file);
+
+	swap(vma->vm_file, file);
+
+	if (file)
+		fput(file);
+
+	return file;
+}
+
These users are all potentially modules.  You need an EXPORT_SYMBOL()?

Oh, good point. Yeah I totally missed that. The initial DMA-buf use case was not inside a module.

Thanks,
Christian.


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