mm/gup: Issues running cudaMallocHost

[Carol Soto]

With kernel 6.11 we are seeing some issues with applications that pin_user_pages*(FOLL_LONGTERM).
We are seeing memory leak and failures to allocate pages when running cuda test that calls cudaMallocHost.

These 2 patches resolved the issue:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/patch/?id=aa6f8b2593b56a02043684182a89853f919dff3e
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/patch/?id=94efde1d15399f5c88e576923db9bcd422d217f2

[Ian May (ian-may)]

Adding additional patch that provides Fixes: 94efde1d1539 ("mm/gup: avoid an unnecessary allocation call for FOLL_LONGTERM cases")

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/patch/?id=a1268be280d8e484ab3606d7476edd0f14bb9961

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux-nvidia-6.11/6.11.0-1009.9 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-noble-linux-nvidia-6.11' to 'verification-done-noble-linux-nvidia-6.11'. If the problem still exists, change the tag 'verification-needed-noble-linux-nvidia-6.11' to 'verification-failed-noble-linux-nvidia-6.11'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Carol Soto (csotog)]

Verified with kernel 6.11.0-1009-nvidia-64k