On Wed, 7 Jul 2021 11:43:13 -0700 Peter Collingbourne <pcc@xxxxxxxxxx> 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@xxxxxxxxxx> > Signed-off-by: Lokesh Gidra <lokeshgidra@xxxxxxxxxx> > Signed-off-by: Peter Collingbourne <pcc@xxxxxxxxxx> > Fixes: c47174fc362a ("userfaultfd: selftest") > Cc: <stable@xxxxxxxxxxxxxxx> # 5.4 This patch then won't apply to earlier kenrels, so please be prepared to help Greg resolve this.