mm/gup: Switch all callers of get_user_pages() to not pass tsk/mm

We will soon modify the vanilla get_user_pages() so it can no
longer be used on mm/tasks other than 'current/current->mm',
which is by far the most common way it is called.  For now,
we allow the old-style calls, but warn when they are used.
(implemented in previous patch)

This patch switches all callers of:

	get_user_pages()
	get_user_pages_unlocked()
	get_user_pages_locked()

to stop passing tsk/mm so they will no longer see the warnings.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave@sr71.net>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: jack@suse.cz
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/20160212210156.113E9407@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

8 files changed, 10 insertions, 18 deletions

diff --git a/arch/cris/arch-v32/drivers/cryptocop.c b/arch/cris/arch-v32/drivers/cryptocop.c
index 877da1908234..617645d21b20 100644
--- a/arch/cris/arch-v32/drivers/cryptocop.c
+++ b/arch/cris/arch-v32/drivers/cryptocop.c
@@ -2719,9 +2719,7 @@ static int cryptocop_ioctl_process(struct inode *inode, struct file *filp, unsig
         /* Acquire the mm page semaphore. */
         down_read(&current->mm->mmap_sem);
 
-        err = get_user_pages(current,
-                             current->mm,
-                             (unsigned long int)(oper.indata + prev_ix),
+        err = get_user_pages((unsigned long int)(oper.indata + prev_ix),
                              noinpages,
                              0,  /* read access only for in data */
                              0, /* no force */
@@ -2736,9 +2734,7 @@ static int cryptocop_ioctl_process(struct inode *inode, struct file *filp, unsig
         }
         noinpages = err;
         if (oper.do_cipher){
-                err = get_user_pages(current,
-                                     current->mm,
-                                     (unsigned long int)oper.cipher_outdata,
+                err = get_user_pages((unsigned long int)oper.cipher_outdata,
                                      nooutpages,
                                      1, /* write access for out data */
                                      0, /* no force */
diff --git a/arch/ia64/kernel/err_inject.c b/arch/ia64/kernel/err_inject.c
index 0c161ed6d18e..09f845793d12 100644
--- a/arch/ia64/kernel/err_inject.c
+++ b/arch/ia64/kernel/err_inject.c
@@ -142,8 +142,7 @@ store_virtual_to_phys(struct device *dev, struct device_attribute *attr,
         u64 virt_addr=simple_strtoull(buf, NULL, 16);
         int ret;
 
-        ret = get_user_pages(current, current->mm, virt_addr,
-                        1, VM_READ, 0, NULL, NULL);
+        ret = get_user_pages(virt_addr, 1, VM_READ, 0, NULL, NULL);
         if (ret<=0) {
 #ifdef ERR_INJ_DEBUG
                 printk("Virtual address %lx is not existing.\n",virt_addr);
diff --git a/arch/mips/mm/gup.c b/arch/mips/mm/gup.c
index 1afd87c999b0..982e83f9d11f 100644
--- a/arch/mips/mm/gup.c
+++ b/arch/mips/mm/gup.c
@@ -286,8 +286,7 @@ slow_irqon:
         start += nr << PAGE_SHIFT;
         pages += nr;
 
-        ret = get_user_pages_unlocked(current, mm, start,
-                                      (end - start) >> PAGE_SHIFT,
+        ret = get_user_pages_unlocked(start, (end - start) >> PAGE_SHIFT,
                                       write, 0, pages);
 
         /* Have to be a bit careful with return values */
diff --git a/arch/s390/mm/gup.c b/arch/s390/mm/gup.c
index 13dab0c1645c..49a1c84ed266 100644
--- a/arch/s390/mm/gup.c
+++ b/arch/s390/mm/gup.c
@@ -210,7 +210,6 @@ int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
 int get_user_pages_fast(unsigned long start, int nr_pages, int write,
                         struct page **pages)
 {
-        struct mm_struct *mm = current->mm;
         int nr, ret;
 
         might_sleep();
@@ -222,8 +221,7 @@ int get_user_pages_fast(unsigned long start, int nr_pages, int write,
         /* Try to get the remaining pages with get_user_pages */
         start += nr << PAGE_SHIFT;
         pages += nr;
-        ret = get_user_pages_unlocked(current, mm, start,
-                             nr_pages - nr, write, 0, pages);
+        ret = get_user_pages_unlocked(start, nr_pages - nr, write, 0, pages);
         /* Have to be a bit careful with return values */
         if (nr > 0)
                 ret = (ret < 0) ? nr : ret + nr;
diff --git a/arch/sh/mm/gup.c b/arch/sh/mm/gup.c
index e7af6a65baab..40fa6c8adc43 100644
--- a/arch/sh/mm/gup.c
+++ b/arch/sh/mm/gup.c
@@ -257,7 +257,7 @@ slow_irqon:
                 start += nr << PAGE_SHIFT;
                 pages += nr;
 
-                ret = get_user_pages_unlocked(current, mm, start,
+                ret = get_user_pages_unlocked(start,
                         (end - start) >> PAGE_SHIFT, write, 0, pages);
 
                 /* Have to be a bit careful with return values */
diff --git a/arch/sparc/mm/gup.c b/arch/sparc/mm/gup.c
index eb3d8e8ebc6b..4e06750a5d29 100644
--- a/arch/sparc/mm/gup.c
+++ b/arch/sparc/mm/gup.c
@@ -237,7 +237,7 @@ slow:
                 start += nr << PAGE_SHIFT;
                 pages += nr;
 
-                ret = get_user_pages_unlocked(current, mm, start,
+                ret = get_user_pages_unlocked(start,
                         (end - start) >> PAGE_SHIFT, write, 0, pages);
 
                 /* Have to be a bit careful with return values */
diff --git a/arch/x86/mm/gup.c b/arch/x86/mm/gup.c
index 6d5eb5900372..ce5e4545203b 100644
--- a/arch/x86/mm/gup.c
+++ b/arch/x86/mm/gup.c
@@ -422,7 +422,7 @@ slow_irqon:
                 start += nr << PAGE_SHIFT;
                 pages += nr;
 
-                ret = get_user_pages_unlocked(current, mm, start,
+                ret = get_user_pages_unlocked(start,
                                               (end - start) >> PAGE_SHIFT,
                                               write, 0, pages);
 
diff --git a/arch/x86/mm/mpx.c b/arch/x86/mm/mpx.c
index b2fd67da1701..84fa4a482c78 100644
--- a/arch/x86/mm/mpx.c
+++ b/arch/x86/mm/mpx.c
@@ -546,8 +546,8 @@ static int mpx_resolve_fault(long __user *addr, int write)
         int nr_pages = 1;
         int force = 0;
 
-        gup_ret = get_user_pages(current, current->mm, (unsigned long)addr,
-                                 nr_pages, write, force, NULL, NULL);
+        gup_ret = get_user_pages((unsigned long)addr, nr_pages, write,
+                        force, NULL, NULL);
         /*
          * get_user_pages() returns number of pages gotten.
          * 0 means we failed to fault in and get anything,