From: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Date: Tue, 22 Sep 2009 00:03:24 +0000 (-0700)
Subject: mm: remove unused GUP flags
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=1c3aff1ceec2cc86810e2690e67873ff0c505862;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git

mm: remove unused GUP flags

GUP_FLAGS_IGNORE_VMA_PERMISSIONS and GUP_FLAGS_IGNORE_SIGKILL were
flags added solely to prevent __get_user_pages() from doing some of
what it usually does, in the munlock case: we can now remove them.

Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/mm/internal.h b/mm/internal.h
index f290c4db528b..166765cd58d6 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -250,10 +250,8 @@ static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
 }
 #endif /* CONFIG_SPARSEMEM */
 
-#define GUP_FLAGS_WRITE                  0x1
-#define GUP_FLAGS_FORCE                  0x2
-#define GUP_FLAGS_IGNORE_VMA_PERMISSIONS 0x4
-#define GUP_FLAGS_IGNORE_SIGKILL         0x8
+#define GUP_FLAGS_WRITE		0x01
+#define GUP_FLAGS_FORCE		0x02
 
 int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
 		     unsigned long start, int len, int flags,
diff --git a/mm/memory.c b/mm/memory.c
index 3cbeaaba5642..4b5200f5f35a 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1217,8 +1217,6 @@ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
 	unsigned int vm_flags = 0;
 	int write = !!(flags & GUP_FLAGS_WRITE);
 	int force = !!(flags & GUP_FLAGS_FORCE);
-	int ignore = !!(flags & GUP_FLAGS_IGNORE_VMA_PERMISSIONS);
-	int ignore_sigkill = !!(flags & GUP_FLAGS_IGNORE_SIGKILL);
 
 	if (nr_pages <= 0)
 		return 0;
@@ -1244,7 +1242,7 @@ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
 			pte_t *pte;
 
 			/* user gate pages are read-only */
-			if (!ignore && write)
+			if (write)
 				return i ? : -EFAULT;
 			if (pg > TASK_SIZE)
 				pgd = pgd_offset_k(pg);
@@ -1278,7 +1276,7 @@ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
 
 		if (!vma ||
 		    (vma->vm_flags & (VM_IO | VM_PFNMAP)) ||
-		    (!ignore && !(vm_flags & vma->vm_flags)))
+		    !(vm_flags & vma->vm_flags))
 			return i ? : -EFAULT;
 
 		if (is_vm_hugetlb_page(vma)) {
@@ -1298,13 +1296,9 @@ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
 
 			/*
 			 * If we have a pending SIGKILL, don't keep faulting
-			 * pages and potentially allocating memory, unless
-			 * current is handling munlock--e.g., on exit. In
-			 * that case, we are not allocating memory.  Rather,
-			 * we're only unlocking already resident/mapped pages.
+			 * pages and potentially allocating memory.
 			 */
-			if (unlikely(!ignore_sigkill &&
-					fatal_signal_pending(current)))
+			if (unlikely(fatal_signal_pending(current)))
 				return i ? i : -ERESTARTSYS;
 
 			if (write)
diff --git a/mm/nommu.c b/mm/nommu.c
index 3b90086e85a2..386443e9d2c6 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -176,7 +176,6 @@ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
 	int i;
 	int write = !!(flags & GUP_FLAGS_WRITE);
 	int force = !!(flags & GUP_FLAGS_FORCE);
-	int ignore = !!(flags & GUP_FLAGS_IGNORE_VMA_PERMISSIONS);
 
 	/* calculate required read or write permissions.
 	 * - if 'force' is set, we only require the "MAY" flags.
@@ -190,8 +189,8 @@ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
 			goto finish_or_fault;
 
 		/* protect what we can, including chardevs */
-		if (vma->vm_flags & (VM_IO | VM_PFNMAP) ||
-		    (!ignore && !(vm_flags & vma->vm_flags)))
+		if ((vma->vm_flags & (VM_IO | VM_PFNMAP)) ||
+		    !(vm_flags & vma->vm_flags))
 			goto finish_or_fault;
 
 		if (pages) {
@@ -210,7 +209,6 @@ finish_or_fault:
 	return i ? : -EFAULT;
 }
 
-
 /*
  * get a list of pages in an address range belonging to the specified process
  * and indicate the VMA that covers each page