tree 7c12b98d5ae8a831491c5876325acbafbf849846
parent aadfddc5eb0ad751dec315dab1d06ff77c9c3716
author Sherry Yang <sherryy@android.com> 1501785233 -0700
committer John Dias <joaodias@google.com> 1505938884 -0700

android: binder: Move buffer out of area shared with user space

Binder driver allocates buffer meta data in a region that is mapped
in user space. These meta data contain pointers in the kernel.

This patch allocates buffer meta data on the kernel heap that is
not mapped in user space, and uses a pointer to refer to the data mapped.

Also move alloc->buffers initialization from mmap to init since it's
now used even when mmap failed or was not called.

Bug: 36007193
Change-Id: I691d522f46388b00400615c8bc55f0dceee821c8
Signed-off-by: Sherry Yang <sherryy@android.com>