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mm: replace get_user_pages() write/force parameters with gup_flags

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This removes the 'write' and 'force' from get_user_pages() and replaces
them with 'gup_flags' to make the use of FOLL_FORCE explicit in callers
as use of this flag can result in surprising behaviour (and hence bugs)
within the mm subsystem.

Signed-off-by: Lorenzo Stoakes <lstoakes@gmail.com>
Acked-by: Christian König <christian.koenig@amd.com>
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Lorenzo Stoakes 2016-10-13 01:20:16 +01:00 • committed by Linus Torvalds
parent 7f23b3504a
commit 768ae309a9
22 changed files with 49 additions and 54 deletions
Download patch file Download diff file Expand all files Collapse all files

18
mm/nommu.c
View file

@ -160,18 +160,11 @@ finish_or_fault:
* - don't permit access to VMAs that don't support it, such as I/O mappings
*/
long get_user_pages(unsigned long start, unsigned long nr_pages,
int write, int force, struct page **pages,
unsigned int gup_flags, struct page **pages,
struct vm_area_struct **vmas)
{
int flags = 0;
if (write)
flags |= FOLL_WRITE;
if (force)
flags |= FOLL_FORCE;
return __get_user_pages(current, current->mm, start, nr_pages, flags,
pages, vmas, NULL);
return __get_user_pages(current, current->mm, start, nr_pages,
gup_flags, pages, vmas, NULL);
}
EXPORT_SYMBOL(get_user_pages);
@ -179,10 +172,7 @@ long get_user_pages_locked(unsigned long start, unsigned long nr_pages,
unsigned int gup_flags, struct page **pages,
int *locked)
{
int write = gup_flags & FOLL_WRITE;
int force = gup_flags & FOLL_FORCE;
return get_user_pages(start, nr_pages, write, force, pages, NULL);
return get_user_pages(start, nr_pages, gup_flags, pages, NULL);
}
EXPORT_SYMBOL(get_user_pages_locked);