[PATCH v4 2/2] selftest: use mmap instead of posix_memalign to allocate memory

[Andrew Morton]

On Wed,  7 Jul 2021 11:43:13 -0700 Peter Collingbourne <pcc at google.com> wrote:

> This test passes pointers obtained from anon_allocate_area to the
> userfaultfd and mremap APIs. This causes a problem if the system
> allocator returns tagged pointers because with the tagged address ABI
> the kernel rejects tagged addresses passed to these APIs, which would
> end up causing the test to fail. To make this test compatible with
> such system allocators, stop using the system allocator to allocate
> memory in anon_allocate_area, and instead just use mmap.

Doesn't apply to current mainline.  Can you please resync and redo?

> Co-developed-by: Lokesh Gidra <lokeshgidra at google.com>
> Signed-off-by: Lokesh Gidra <lokeshgidra at google.com>
> Signed-off-by: Peter Collingbourne <pcc at google.com>
> Fixes: c47174fc362a ("userfaultfd: selftest")
> Cc: <stable at vger.kernel.org> # 5.4

This patch then won't apply to earlier kenrels, so please be prepared
to help Greg resolve this.