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authorLorenzo Stoakes <lstoakes@gmail.com>2016-12-14 15:06:55 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-14 16:04:09 -0800
commit8b7457ef9a9eb46cd1675d40d8e1fd3c47a38395 (patch)
tree485def76ab013b2609eb24762e4c39fc531c72d7 /mm/process_vm_access.c
parent5b56d49fc31dbb0487e14ead790fc81ca9fb2c99 (diff)
downloadlinux-8b7457ef9a9eb46cd1675d40d8e1fd3c47a38395.tar.bz2
mm: unexport __get_user_pages_unlocked()
Unexport the low-level __get_user_pages_unlocked() function and replaces invocations with calls to more appropriate higher-level functions. In hva_to_pfn_slow() we are able to replace __get_user_pages_unlocked() with get_user_pages_unlocked() since we can now pass gup_flags. In async_pf_execute() and process_vm_rw_single_vec() we need to pass different tsk, mm arguments so get_user_pages_remote() is the sane replacement in these cases (having added manual acquisition and release of mmap_sem.) Additionally get_user_pages_remote() reintroduces use of the FOLL_TOUCH flag. However, this flag was originally silently dropped by commit 1e9877902dc7 ("mm/gup: Introduce get_user_pages_remote()"), so this appears to have been unintentional and reintroducing it is therefore not an issue. [akpm@linux-foundation.org: coding-style fixes] Link: http://lkml.kernel.org/r/20161027095141.2569-3-lstoakes@gmail.com Signed-off-by: Lorenzo Stoakes <lstoakes@gmail.com> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Jan Kara <jack@suse.cz> Cc: Hugh Dickins <hughd@google.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Rik van Riel <riel@redhat.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Radim Krcmar <rkrcmar@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/process_vm_access.c')
-rw-r--r--mm/process_vm_access.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/mm/process_vm_access.c b/mm/process_vm_access.c
index be8dc8d1edb9..84d0c7eada2b 100644
--- a/mm/process_vm_access.c
+++ b/mm/process_vm_access.c
@@ -88,7 +88,7 @@ static int process_vm_rw_single_vec(unsigned long addr,
ssize_t rc = 0;
unsigned long max_pages_per_loop = PVM_MAX_KMALLOC_PAGES
/ sizeof(struct pages *);
- unsigned int flags = FOLL_REMOTE;
+ unsigned int flags = 0;
/* Work out address and page range required */
if (len == 0)
@@ -100,15 +100,19 @@ static int process_vm_rw_single_vec(unsigned long addr,
while (!rc && nr_pages && iov_iter_count(iter)) {
int pages = min(nr_pages, max_pages_per_loop);
+ int locked = 1;
size_t bytes;
/*
* Get the pages we're interested in. We must
- * add FOLL_REMOTE because task/mm might not
+ * access remotely because task/mm might not
* current/current->mm
*/
- pages = __get_user_pages_unlocked(task, mm, pa, pages,
- process_pages, flags);
+ down_read(&mm->mmap_sem);
+ pages = get_user_pages_remote(task, mm, pa, pages, flags,
+ process_pages, NULL, &locked);
+ if (locked)
+ up_read(&mm->mmap_sem);
if (pages <= 0)
return -EFAULT;