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| author |  Jason Gunthorpe <jgg@nvidia.com>
| 2023-01-24 16:34:34 -0400 |
|---|---|---|
| committer |  Andrew Morton <akpm@linux-foundation.org>
| 2023-02-09 16:51:45 -0800 |
| commit | 2c2241081f7dec878331fdc3a3f2361e99556bca (patch) | |
| tree | e5ca9e9d46b394af7536f51581d2d2bbda7ed5b0 /mm | |
| parent | mm/gup: move gup_must_unshare() to mm/internal.h (diff) | |
| download | linux-2c2241081f7dec878331fdc3a3f2361e99556bca.tar.gz linux-2c2241081f7dec878331fdc3a3f2361e99556bca.tar.bz2 linux-2c2241081f7dec878331fdc3a3f2361e99556bca.zip | |
mm/gup: move private gup FOLL_ flags to internal.h
Move the flags that should not/are not used outside gup.c and related into
mm/internal.h to discourage driver abuse.
To make this more maintainable going forward compact the two FOLL ranges
with new bit numbers from 0 to 11 and 16 to 21, using shifts so it is
explicit.
Switch to an enum so the whole thing is easier to read.
Link: https://lkml.kernel.org/r/13-v2-987e91b59705+36b-gup_tidy_jgg@nvidia.com
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Claudio Imbrenda <imbrenda@linux.ibm.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Mike Rapoport (IBM) <rppt@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/internal.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/mm/internal.h b/mm/internal.h index 4f5ca3401b05..dfb37e94e140 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -858,6 +858,21 @@ int migrate_device_coherent_page(struct page *page); struct folio *try_grab_folio(struct page *page, int refs, unsigned int flags); int __must_check try_grab_page(struct page *page, unsigned int flags); +enum { + /* mark page accessed */ + FOLL_TOUCH = 1 << 16, + /* a retry, previous pass started an IO */ + FOLL_TRIED = 1 << 17, + /* we are working on non-current tsk/mm */ + FOLL_REMOTE = 1 << 18, + /* pages must be released via unpin_user_page */ + FOLL_PIN = 1 << 19, + /* gup_fast: prevent fall-back to slow gup */ + FOLL_FAST_ONLY = 1 << 20, + /* allow unlocking the mmap lock */ + FOLL_UNLOCKABLE = 1 << 21, +}; + /* * Indicates for which pages that are write-protected in the page table, * whether GUP has to trigger unsharing via FAULT_FLAG_UNSHARE such that the |