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authorJason Gunthorpe <jgg@nvidia.com>2023-01-24 16:34:32 -0400
committerAndrew Morton <akpm@linux-foundation.org>2023-02-09 16:51:45 -0800
commit9198a9196ee67814a101c178ed828f8ea9c2965e (patch)
treeacdf88a4b0afa2e7006d414d778e9e421bb8911d /mm
parentedad1bb1fbf7e28b49bf76b2aa66bfcaba00f627 (diff)
mm/gup: make get_user_pages_fast_only() return the common return value
There are only two callers, both can handle the common return code: - get_user_page_fast_only() checks == 1 - gfn_to_page_many_atomic() already returns -1, and the only caller checks for negative return values Remove the restriction against returning negative values. Link: https://lkml.kernel.org/r/11-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> Reviewed-by: David Hildenbrand <david@redhat.com> Cc: Alistair Popple <apopple@nvidia.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Claudio Imbrenda <imbrenda@linux.ibm.com> Cc: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/gup.c17
1 files changed, 1 insertions, 16 deletions
diff --git a/mm/gup.c b/mm/gup.c
index 91c8ab53f43f..91d047096c09 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -3005,8 +3005,6 @@ static int internal_get_user_pages_fast(unsigned long start,
*
* Like get_user_pages_fast() except it's IRQ-safe in that it won't fall back to
* the regular GUP.
- * Note a difference with get_user_pages_fast: this always returns the
- * number of pages pinned, 0 if no pages were pinned.
*
* If the architecture does not support this function, simply return with no
* pages pinned.
@@ -3018,7 +3016,6 @@ static int internal_get_user_pages_fast(unsigned long start,
int get_user_pages_fast_only(unsigned long start, int nr_pages,
unsigned int gup_flags, struct page **pages)
{
- int nr_pinned;
/*
* Internally (within mm/gup.c), gup fast variants must set FOLL_GET,
* because gup fast is always a "pin with a +1 page refcount" request.
@@ -3030,19 +3027,7 @@ int get_user_pages_fast_only(unsigned long start, int nr_pages,
FOLL_GET | FOLL_FAST_ONLY))
return -EINVAL;
- nr_pinned = internal_get_user_pages_fast(start, nr_pages, gup_flags,
- pages);
-
- /*
- * As specified in the API description above, this routine is not
- * allowed to return negative values. However, the common core
- * routine internal_get_user_pages_fast() *can* return -errno.
- * Therefore, correct for that here:
- */
- if (nr_pinned < 0)
- nr_pinned = 0;
-
- return nr_pinned;
+ return internal_get_user_pages_fast(start, nr_pages, gup_flags, pages);
}
EXPORT_SYMBOL_GPL(get_user_pages_fast_only);