From: Al Viro <viro@zeniv.linux.org.uk>
Date: Mon, 5 Mar 2012 18:35:49 +0000 (-0500)
Subject: VM: can't go through the inner loop in unmap_vmas() more than once...
X-Git-Tag: firefly_0821_release~3680^2~3325^2~4
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8b2a12382ccc9df31b27dac37fe04dffe088b57c;p=firefly-linux-kernel-4.4.55.git

VM: can't go through the inner loop in unmap_vmas() more than once...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/mm/memory.c b/mm/memory.c
index 1b6712a9720d..f2317c85704e 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1354,7 +1354,7 @@ unsigned long unmap_vmas(struct mmu_gather *tlb,
 		if (unlikely(is_pfn_mapping(vma)))
 			untrack_pfn_vma(vma, 0, 0);
 
-		while (start != end) {
+		if (start != end) {
 			if (unlikely(is_vm_hugetlb_page(vma))) {
 				/*
 				 * It is undesirable to test vma->vm_file as it
@@ -1371,8 +1371,8 @@ unsigned long unmap_vmas(struct mmu_gather *tlb,
 					unmap_hugepage_range(vma, start, end, NULL);
 			} else
 				unmap_page_range(tlb, vma, start, end, details);
-			start = end;
 		}
+		start = end;
 	}
 
 	mmu_notifier_invalidate_range_end(mm, start_addr, end_addr);