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U2FsdGVkX1/6J24uxUaiEty+gwzFJS/pgzqCeAB0vAaPSS/DrycE5KdxcTP5EjTmcWBOBTnQhZt5C6Q6m4e+s1Q2JYLfjfoK6k7RXxN+k1jIjRO/vswitOYfBOUHeRN5eP9BpPosm+QA2Ze3iciNcEbIKxgxl2pJqeci1a9U5Voy5/j93YgMgisSqUmEwAaxUy5FG4Cdpb6op+vBTHmPbVJrS/1V2AAjhnQ3jdkUX3qTWdLG1vN19GfuwMpVOXbTw4F2DD0g5G570F3ImcupzgYbwwKc1bh1mdiNjiGsrAKpRquoL0AG/dO5hUuYRABqMlGpWjahDWJgxTgzDFmVg16+76Rogts04DFirAOJE78eO0nZvSOnXCr0NCiTKHvVbZwftxZXD62j7yuUKIIKXZALAljEAZdMKmEi0GwQU0AkogOI5d4Etuu4ICzycoQJgXkISjt7NahG0KnjkGBbcZ9/0K9BdTywJJ2EO7KQKLW/h/kkFey3eR1/G/YqBHMWsmFwc9/4CY0hzp9TY3a4C+hHy8BeYGIGj07ZhyqBSh40RGROnx1H/AutZ1Y9YJGMW4YUilHQQXHJl8MiH+5SMyZ7Bc9r9p3E2PeCZSVGakK4YKRvfwv4QrnYHDbT6TBy8RVHO8+Xe+UXy5Xh0M9pPV915yht3niuxAzrAPgMf+x2iyIJ/+983YBCR/h9xyIaoKkxFsS4kHbKESXighbRl8wJBhNxhfvwhgfljVHl05GriMt8Ph/oopIUma3C2BoiekIg/DMy4gFd5mHwXV9R7Mpu4cRQ/PQQs0YhriMnLTYrD9+GHi5xBhczb1G9couQ4WF/oDVDSAP3CTs3QGN+WSLCLaTdiXKUrGyXazsrYHOpUg54m2UU7RaKn2nOsqUCyYyMhCRS39I6ZaB1VUxUSr1vmA/cYP7T+OZhYFw2hje6bFy0vff9oLAiL1KhJRckQOhxMZA9ROYX9CDNi0U qSH6I9Do 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Ryhl wrote: > On Fri, Nov 29, 2024 at 5:32 PM Alice Ryhl wrote: > > > > This adds a type called VmAreaRef which is used when referencing a vma > > that you have read access to. Here, read access means that you hold > > either the mmap read lock or the vma read lock (or stronger). > > > > Additionally, a vma_lookup method is added to the mmap read guard, which > > enables you to obtain a &VmAreaRef in safe Rust code. > > > > This patch only provides a way to lock the mmap read lock, but a > > follow-up patch also provides a way to just lock the vma read lock. > > > > Acked-by: Lorenzo Stoakes (for mm bits) > > Reviewed-by: Jann Horn > > Signed-off-by: Alice Ryhl > > It looks like binder needs a way to check whether a given vma is > associated with a given mm. I guess we can do that by adding a method > to VmAreaRef that returns a &MmWithUser. Presumably this would be with a lock held to ensure the VMA doesn't disappear from under us? I guess that's implied by possessing a VmAreaRef in the first place. I also suppoes that the mm having users is implied by you having the VMA that implies a lock held on it :) So that's probably fine then, as long as you can implement some sensible means of comparison between a known 'given mm' vs. the &MmWithUser. > > This indicates that vma->vm_mm references an mm with non-zero mm_users > whenever it's legal to have a reference to the vma. > > Alice