linux-kernel - [PATCH 03/37] mm: kill get_user_pages

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Date:	Mon, 16 Nov 2015 19:35:15 -0800
From:	Dave Hansen <dave@...1.net>
To:	linux-kernel@...r.kernel.org
Cc:	x86@...nel.org, Dave Hansen <dave@...1.net>,
	dave.hansen@...ux.intel.com, akpm@...ux-foundation.org,
	kirill.shutemov@...ux.intel.com, aarcange@...hat.com,
	n-horiguchi@...jp.nec.com
Subject: [PATCH 03/37] mm: kill get_user_pages_locked()


From: Dave Hansen <dave.hansen@...ux.intel.com>

We have no remaining users of get_user_pages_locked().  Kill it.

Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
---

 b/include/linux/mm.h |    4 ----
 b/mm/gup.c           |   31 -------------------------------
 2 files changed, 35 deletions(-)

diff -puN include/linux/mm.h~kill-get_user_pages_locked include/linux/mm.h
--- a/include/linux/mm.h~kill-get_user_pages_locked	2015-11-16 12:35:35.684187540 -0800
+++ b/include/linux/mm.h	2015-11-16 12:35:35.689187767 -0800
@@ -1195,10 +1195,6 @@ long get_user_pages(struct task_struct *
 		    unsigned long start, unsigned long nr_pages,
 		    int write, int force, struct page **pages,
 		    struct vm_area_struct **vmas);
-long get_user_pages_locked(struct task_struct *tsk, struct mm_struct *mm,
-		    unsigned long start, unsigned long nr_pages,
-		    int write, int force, struct page **pages,
-		    int *locked);
 long __get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm,
 			       unsigned long start, unsigned long nr_pages,
 			       int write, int force, struct page **pages,
diff -puN mm/gup.c~kill-get_user_pages_locked mm/gup.c
--- a/mm/gup.c~kill-get_user_pages_locked	2015-11-16 12:35:35.686187631 -0800
+++ b/mm/gup.c	2015-11-16 12:35:35.690187812 -0800
@@ -715,37 +715,6 @@ static __always_inline long __get_user_p
 }
 
 /*
- * We can leverage the VM_FAULT_RETRY functionality in the page fault
- * paths better by using either get_user_pages_locked() or
- * get_user_pages_unlocked().
- *
- * get_user_pages_locked() is suitable to replace the form:
- *
- *      down_read(&mm->mmap_sem);
- *      do_something()
- *      get_user_pages(tsk, mm, ..., pages, NULL);
- *      up_read(&mm->mmap_sem);
- *
- *  to:
- *
- *      int locked = 1;
- *      down_read(&mm->mmap_sem);
- *      do_something()
- *      get_user_pages_locked(tsk, mm, ..., pages, &locked);
- *      if (locked)
- *          up_read(&mm->mmap_sem);
- */
-long get_user_pages_locked(struct task_struct *tsk, struct mm_struct *mm,
-			   unsigned long start, unsigned long nr_pages,
-			   int write, int force, struct page **pages,
-			   int *locked)
-{
-	return __get_user_pages_locked(tsk, mm, start, nr_pages, write, force,
-				       pages, NULL, locked, true, FOLL_TOUCH);
-}
-EXPORT_SYMBOL(get_user_pages_locked);
-
-/*
  * Same as get_user_pages_unlocked(...., FOLL_TOUCH) but it allows to
  * pass additional gup_flags as last parameter (like FOLL_HWPOISON).
  *
_
--
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