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Merge branch 'work.get_user_pages_fast' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Forráskód böngészése 
Pull get_user_pages_fast updates from Al Viro:
 "A bit more get_user_pages work"

* 'work.get_user_pages_fast' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  kvm: switch get_user_page_nowait() to get_user_pages_unlocked()
  __get_user_pages_locked(): get rid of notify_drop argument
  get_user_pages_unlocked(): pass true to __get_user_pages_locked() notify_drop
  cris: switch to get_user_pages_fast()
  fold __get_user_pages_unlocked() into its sole remaining caller
This commit is contained in:
Linus Torvalds
2018-01-31 10:01:08 -08:00
szülő 19e7b5f994 ce53053ce3
commit 5a87e37ee0
3 fájl változott, egészen pontosan 34 új sor hozzáadva és 78 régi sor törölve
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46
mm/gup.c
Fájl megtekintése

@@ -848,7 +848,7 @@ static __always_inline long __get_user_pages_locked(struct task_struct *tsk,
unsigned long nr_pages,
struct page **pages,
struct vm_area_struct **vmas,
int *locked, bool notify_drop,
int *locked,
unsigned int flags)
{
long ret, pages_done;
@@ -922,7 +922,7 @@ static __always_inline long __get_user_pages_locked(struct task_struct *tsk,
pages++;
start += PAGE_SIZE;
}
if (notify_drop && lock_dropped && *locked) {
if (lock_dropped && *locked) {
/*
* We must let the caller know we temporarily dropped the lock
* and so the critical section protected by it was lost.
@@ -959,35 +959,11 @@ long get_user_pages_locked(unsigned long start, unsigned long nr_pages,
int *locked)
{
return __get_user_pages_locked(current, current->mm, start, nr_pages,
pages, NULL, locked, true,
pages, NULL, locked,
gup_flags | FOLL_TOUCH);
}
EXPORT_SYMBOL(get_user_pages_locked);
/*
* Same as get_user_pages_unlocked(...., FOLL_TOUCH) but it allows for
* tsk, mm to be specified.
*
* NOTE: here FOLL_TOUCH is not set implicitly and must be set by the
* caller if required (just like with __get_user_pages). "FOLL_GET"
* is set implicitly if "pages" is non-NULL.
*/
static __always_inline long __get_user_pages_unlocked(struct task_struct *tsk,
struct mm_struct *mm, unsigned long start,
unsigned long nr_pages, struct page **pages,
unsigned int gup_flags)
{
long ret;
int locked = 1;
down_read(&mm->mmap_sem);
ret = __get_user_pages_locked(tsk, mm, start, nr_pages, pages, NULL,
&locked, false, gup_flags);
if (locked)
up_read(&mm->mmap_sem);
return ret;
}
/*
* get_user_pages_unlocked() is suitable to replace the form:
*
@@ -1006,8 +982,16 @@ static __always_inline long __get_user_pages_unlocked(struct task_struct *tsk,
long get_user_pages_unlocked(unsigned long start, unsigned long nr_pages,
struct page **pages, unsigned int gup_flags)
{
return __get_user_pages_unlocked(current, current->mm, start, nr_pages,
pages, gup_flags | FOLL_TOUCH);
struct mm_struct *mm = current->mm;
int locked = 1;
long ret;
down_read(&mm->mmap_sem);
ret = __get_user_pages_locked(current, mm, start, nr_pages, pages, NULL,
&locked, gup_flags | FOLL_TOUCH);
if (locked)
up_read(&mm->mmap_sem);
return ret;
}
EXPORT_SYMBOL(get_user_pages_unlocked);
@@ -1073,7 +1057,7 @@ long get_user_pages_remote(struct task_struct *tsk, struct mm_struct *mm,
struct vm_area_struct **vmas, int *locked)
{
return __get_user_pages_locked(tsk, mm, start, nr_pages, pages, vmas,
locked, true,
locked,
gup_flags | FOLL_TOUCH | FOLL_REMOTE);
}
EXPORT_SYMBOL(get_user_pages_remote);
@@ -1090,7 +1074,7 @@ long get_user_pages(unsigned long start, unsigned long nr_pages,
struct vm_area_struct **vmas)
{
return __get_user_pages_locked(current, current->mm, start, nr_pages,
pages, vmas, NULL, false,
pages, vmas, NULL,
gup_flags | FOLL_TOUCH);
}
EXPORT_SYMBOL(get_user_pages);