[RFC PATCH 3/5] mm: mremap: Allow new_addr to be specified as a hint

[Brian Geffon <bgeffon@google.com>]

When using MREMAP_MAYMOVE previously the new_addr was ignored unless
the user specified MREMAP_FIXED. This change will allow it to be
used as a hint in that situation similar to how mmap(2) behaves.

get_unmapped_area() will handle page aligning the new address hint.

Signed-off-by: Brian Geffon <bgeffon@google.com>
---
 mm/mremap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/mremap.c b/mm/mremap.c
index fdc1b0f1b38e..1d2522fba0ef 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -1205,7 +1205,7 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len,
 		if (vma->vm_flags & VM_MAYSHARE)
 			map_flags |= MAP_SHARED;
 
-		new_addr = get_unmapped_area(vma->vm_file, 0, new_len,
+		new_addr = get_unmapped_area(vma->vm_file, new_addr, new_len,
 					vma->vm_pgoff +
 					((addr - vma->vm_start) >> PAGE_SHIFT),
 					map_flags);
-- 
2.47.0.338.g60cca15819-goog