Merge branch 'perf/core' into perf/uprobes

Merge in latest upstream (and the latest perf development tree),
to prepare for tooling changes, and also to pick up v3.4 MM
changes that the uprobes code needs to take care of.

Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 25 insertions, 32 deletions

diff --git a/mm/ksm.c b/mm/ksm.c
index 1925ffbfb27..47c88536889 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -28,7 +28,6 @@
 #include <linux/kthread.h>
 #include <linux/wait.h>
 #include <linux/slab.h>
-#include <linux/memcontrol.h>
 #include <linux/rbtree.h>
 #include <linux/memory.h>
 #include <linux/mmu_notifier.h>
@@ -375,6 +374,20 @@ static int break_ksm(struct vm_area_struct *vma, unsigned long addr)
 	return (ret & VM_FAULT_OOM) ? -ENOMEM : 0;
 }
 
+static struct vm_area_struct *find_mergeable_vma(struct mm_struct *mm,
+		unsigned long addr)
+{
+	struct vm_area_struct *vma;
+	if (ksm_test_exit(mm))
+		return NULL;
+	vma = find_vma(mm, addr);
+	if (!vma || vma->vm_start > addr)
+		return NULL;
+	if (!(vma->vm_flags & VM_MERGEABLE) || !vma->anon_vma)
+		return NULL;
+	return vma;
+}
+
 static void break_cow(struct rmap_item *rmap_item)
 {
 	struct mm_struct *mm = rmap_item->mm;
@@ -388,15 +401,9 @@ static void break_cow(struct rmap_item *rmap_item)
 	put_anon_vma(rmap_item->anon_vma);
 
 	down_read(&mm->mmap_sem);
-	if (ksm_test_exit(mm))
-		goto out;
-	vma = find_vma(mm, addr);
-	if (!vma || vma->vm_start > addr)
-		goto out;
-	if (!(vma->vm_flags & VM_MERGEABLE) || !vma->anon_vma)
-		goto out;
-	break_ksm(vma, addr);
-out:
+	vma = find_mergeable_vma(mm, addr);
+	if (vma)
+		break_ksm(vma, addr);
 	up_read(&mm->mmap_sem);
 }
 
@@ -422,12 +429,8 @@ static struct page *get_mergeable_page(struct rmap_item *rmap_item)
 	struct page *page;
 
 	down_read(&mm->mmap_sem);
-	if (ksm_test_exit(mm))
-		goto out;
-	vma = find_vma(mm, addr);
-	if (!vma || vma->vm_start > addr)
-		goto out;
-	if (!(vma->vm_flags & VM_MERGEABLE) || !vma->anon_vma)
+	vma = find_mergeable_vma(mm, addr);
+	if (!vma)
 		goto out;
 
 	page = follow_page(vma, addr, FOLL_GET);
@@ -673,9 +676,9 @@ error:
 static u32 calc_checksum(struct page *page)
 {
 	u32 checksum;
-	void *addr = kmap_atomic(page, KM_USER0);
+	void *addr = kmap_atomic(page);
 	checksum = jhash2(addr, PAGE_SIZE / 4, 17);
-	kunmap_atomic(addr, KM_USER0);
+	kunmap_atomic(addr);
 	return checksum;
 }
 
@@ -684,11 +687,11 @@ static int memcmp_pages(struct page *page1, struct page *page2)
 	char *addr1, *addr2;
 	int ret;
 
-	addr1 = kmap_atomic(page1, KM_USER0);
-	addr2 = kmap_atomic(page2, KM_USER1);
+	addr1 = kmap_atomic(page1);
+	addr2 = kmap_atomic(page2);
 	ret = memcmp(addr1, addr2, PAGE_SIZE);
-	kunmap_atomic(addr2, KM_USER1);
-	kunmap_atomic(addr1, KM_USER0);
+	kunmap_atomic(addr2);
+	kunmap_atomic(addr1);
 	return ret;
 }
 
@@ -1572,16 +1575,6 @@ struct page *ksm_does_need_to_copy(struct page *page,
 
 	new_page = alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, address);
 	if (new_page) {
-		/*
-		 * The memcg-specific accounting when moving
-		 * pages around the LRU lists relies on the
-		 * page's owner (memcg) to be valid.  Usually,
-		 * pages are assigned to a new owner before
-		 * being put on the LRU list, but since this
-		 * is not the case here, the stale owner from
-		 * a previous allocation cycle must be reset.
-		 */
-		mem_cgroup_reset_owner(new_page);
 		copy_user_highpage(new_page, page, address, vma);
 
 		SetPageDirty(new_page);