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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