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FROMGIT: userfaultfd/selftests: use user mode only

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Patch series "userfaultfd/selftests: A few cleanups".

I wanted to cleanup userfaultfd.c fault handling for a long time.  If it's
not cleaned, when the new code grows the file it'll also grow the size
that needs to be cleaned...  This is my attempt to cleanup the userfaultfd
selftest on fault handling, to use an err() macro instead of either
fprintf() or perror() then another exit() call.

The huge cleanup is done in the last patch.  The first 4 patches are some
other standalone cleanups for the same file, so I put them together.

This patch (of 5):

Userfaultfd selftest does not need to handle kernel initiated fault.  Set
user mode so it can be run even if unprivileged_userfaultfd=0 (which is
the default).

Link: https://lkml.kernel.org/r/20210310004511.51996-2-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Axel Rasmussen <axelrasmussen@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Nadav Amit <nadav.amit@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

(cherry picked from commit eaf221e6a1916d2471309800e4534bdc0698af33
https: //git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git akpm)
Link: https://lore.kernel.org/patchwork/patch/1392475/
Signed-off-by: Lokesh Gidra <lokeshgidra@google.com>
Bug: 160737021
Bug: 169683130
Change-Id: Ie3f0708b3c1a25ea66e4e0795e4ea54ca938c7a1
This commit is contained in:
Peter Xu
2021-03-18 17:01:52 +11:00
committed by Todd Kjos
parent 2039d96cb7
commit 1e1eb31e95
1 changed files with 1 additions and 1 deletions
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2
tools/testing/selftests/vm/userfaultfd.c
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@@ -372,7 +372,7 @@ static int userfaultfd_open(uint64_t *features)
{
struct uffdio_api uffdio_api;
uffd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK);
uffd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK | UFFD_USER_MODE_ONLY);
if (uffd < 0) {
fprintf(stderr,
"userfaultfd syscall not available in this kernel\n");