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author | Lorenzo Stoakes <lstoakes@gmail.com> | 2016-10-13 03:20:16 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-12-17 23:55:16 +0300 |
commit | 8e50b8b07f462ab4b91bc1491b1c91bd75e4ad40 (patch) | |
tree | 8d8e4110fcbdad29416f5fa7ad3a512a6ff8cec8 /mm | |
parent | 3ec22a6bce3f06aa3b8a399ea456fb1cb3792584 (diff) | |
download | linux-8e50b8b07f462ab4b91bc1491b1c91bd75e4ad40.tar.xz |
mm: replace get_user_pages() write/force parameters with gup_flags
commit 768ae309a96103ed02eb1e111e838c87854d8b51 upstream.
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>
[bwh: Backported to 4.4:
- Drop changes in rapidio, vchiq, goldfish
- Keep the "write" variable in amdgpu_ttm_tt_pin_userptr() as it's still
needed
- Also update calls from various other places that now use
get_user_pages_remote() upstream, which were updated there by commit
9beae1ea8930 "mm: replace get_user_pages_remote() write/force ..."
- Also update calls from hfi1 and ipath
- Adjust context]
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm')
-rw-r--r-- | mm/gup.c | 15 | ||||
-rw-r--r-- | mm/memory.c | 6 | ||||
-rw-r--r-- | mm/mempolicy.c | 2 | ||||
-rw-r--r-- | mm/nommu.c | 18 |
4 files changed, 15 insertions, 26 deletions
@@ -854,18 +854,13 @@ EXPORT_SYMBOL(get_user_pages_unlocked); * FAULT_FLAG_ALLOW_RETRY to handle_mm_fault. */ long get_user_pages(struct task_struct *tsk, struct mm_struct *mm, - unsigned long start, unsigned long nr_pages, int write, - int force, struct page **pages, struct vm_area_struct **vmas) + unsigned long start, unsigned long nr_pages, + unsigned int gup_flags, struct page **pages, + struct vm_area_struct **vmas) { - unsigned int flags = FOLL_TOUCH; - - if (write) - flags |= FOLL_WRITE; - if (force) - flags |= FOLL_FORCE; - return __get_user_pages_locked(tsk, mm, start, nr_pages, - pages, vmas, NULL, false, flags); + pages, vmas, NULL, false, + gup_flags | FOLL_TOUCH); } EXPORT_SYMBOL(get_user_pages); diff --git a/mm/memory.c b/mm/memory.c index 5aee9ec8b8c6..13142accda4f 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3715,6 +3715,10 @@ static int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm, { struct vm_area_struct *vma; void *old_buf = buf; + unsigned int flags = FOLL_FORCE; + + if (write) + flags |= FOLL_WRITE; down_read(&mm->mmap_sem); /* ignore errors, just check how much was successfully transferred */ @@ -3724,7 +3728,7 @@ static int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm, struct page *page = NULL; ret = get_user_pages(tsk, mm, addr, 1, - write, 1, &page, &vma); + flags, &page, &vma); if (ret <= 0) { #ifndef CONFIG_HAVE_IOREMAP_PROT break; diff --git a/mm/mempolicy.c b/mm/mempolicy.c index be9840bf11d1..44134ba6fb53 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -818,7 +818,7 @@ static int lookup_node(struct mm_struct *mm, unsigned long addr) struct page *p; int err; - err = get_user_pages(current, mm, addr & PAGE_MASK, 1, 0, 0, &p, NULL); + err = get_user_pages(current, mm, addr & PAGE_MASK, 1, 0, &p, NULL); if (err >= 0) { err = page_to_nid(p); put_page(p); diff --git a/mm/nommu.c b/mm/nommu.c index 6cbb985238c4..073ea36abc21 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -184,18 +184,11 @@ finish_or_fault: */ long get_user_pages(struct task_struct *tsk, struct mm_struct *mm, 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(tsk, mm, start, nr_pages, flags, pages, vmas, - NULL); + return __get_user_pages(tsk, mm, start, nr_pages, + gup_flags, pages, vmas, NULL); } EXPORT_SYMBOL(get_user_pages); @@ -204,10 +197,7 @@ long get_user_pages_locked(struct task_struct *tsk, struct mm_struct *mm, 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(tsk, mm, start, nr_pages, write, force, + return get_user_pages(tsk, mm, start, nr_pages, gup_flags, pages, NULL); } EXPORT_SYMBOL(get_user_pages_locked); |