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.