Verification for linux-nvidia/6.8.0-1066.69, I ran the reproducer from
comment #7 on this kernel. It indicates that this kernel is indeed
patched:
noble/linux-nvidia 6.8.0-1066-nvidia
$ ./gupbench -p 512 -r 5 -i 200 1 8 32 128
page size: 4K, pages/thread: 512, reps: 5, iters: 200
get_user_pages_fast_only() verdict:
gupfast (alloc_page+vm_insert_page): 512/512
anon (control) : 512/512
pin_user_pages_fast(FOLL_WRITE) median ns/page:
threads gupfast anon
1 29.3 23.0
8 23.3 30.9
32 22.1 21.9
128 21.6 21.6
RESULT: PASS - GUP-fast accepts NULL-mapping order-0 folios (fixed)
** Tags removed: verification-needed-noble-linux-nvidia
** Tags added: verification-done-noble-linux-nvidia
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https://bugs.launchpad.net/bugs/2162917
Title:
Backport: "mm/gup: fix GUP-fast fallback for NULL-mapping order-0
folios"
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