mm/gup: add FOLL_UNLOCKABLE

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Setting FOLL_UNLOCKABLE allows GUP to lock/unlock the mmap lock on its
own.  It is a more explicit replacement for locked != NULL.  This clears
the way for passing in locked = 1, without intending that the lock can be
unlocked.

Set the flag in all cases where it is used, eg locked is present in the
external interface or locked is used internally with locked = 0.

Link: https://lkml.kernel.org/r/8-v2-987e91b59705+36b-gup_tidy_jgg@nvidia.com
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Acked-by: Mike Rapoport (IBM) <rppt@kernel.org>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Claudio Imbrenda <imbrenda@linux.ibm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

...

This commit is contained in:

Jason Gunthorpe 2023-01-24 16:34:29 -04:00 • committed by Andrew Morton

parent 6e4382c706

commit f04740f545

2 changed files with 24 additions and 13 deletions

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1

include/linux/mm_types.h

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36

mm/gup.c

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