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Audra Mitchell 52d9b5f0b6 mm/gup: remove the restriction on locked with FOLL_LONGTERM JIRA: https://issues.redhat.com/browse/RHEL-27739 This patch is a backport of the following upstream commit: commit 53b2d09bdd12092a7341c08b6b863560db62fa57 Author: Jason Gunthorpe <jgg@ziepe.ca> Date: Wed Nov 16 16:07:09 2022 -0400 mm/gup: remove the restriction on locked with FOLL_LONGTERM This restriction was created because FOLL_LONGTERM used to scan the vma list, so it could not tolerate becoming unlocked. That was fixed in commit `52650c8b46` ("mm/gup: remove the vma allocation from gup_longterm_locked()") and the restriction on !vma was removed. However, the locked restriction remained, even though it isn't necessary anymore. Adjust __gup_longterm_locked() so it can handle the mmap_read_lock() becoming unlocked while it is looping for migration. Migration does not require the mmap_read_sem because it is only handling struct pages. If we had to unlock then ensure the whole thing returns unlocked. Remove __get_user_pages_remote() and __gup_longterm_unlocked(). These cases can now just directly call other functions. Link: https://lkml.kernel.org/r/0-v1-b9ae39aa8884+14dbb-gup_longterm_locked_jgg@nvidia.com Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> Reviewed-by: John Hubbard <jhubbard@nvidia.com> Cc: Alistair Popple <apopple@nvidia.com> Cc: John Hubbard <jhubbard@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Audra Mitchell <audra@redhat.com>		2024-04-09 09:42:57 -04:00
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README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.