selftests/mm: hugetlb_fault_after_madv: improve test output

Let's improve the test output.  For example, print the proper test result.
Install a SIGBUS handler to catch any SIGBUS instead of crashing the test
on failure.

With unsuitable hugetlb page count:
  $ ./hugetlb_fault_after_madv
  TAP version 13
  1..1
  # [INFO] detected default hugetlb page size: 2048 KiB
  ok 2 # SKIP This test needs one and only one page to execute. Got 0
  # Totals: pass:0 fail:0 xfail:0 xpass:0 skip:1 error:0

On a failure:
  $ ./hugetlb_fault_after_madv
  TAP version 13
  1..1
  not ok 1 SIGBUS behavior
  Bail out! 1 out of 1 tests failed

On success:
  $ ./hugetlb_fault_after_madv
  TAP version 13
  1..1
  # [INFO] detected default hugetlb page size: 2048 KiB
  ok 1 SIGBUS behavior
  # Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: David Hildenbrand <[email protected]>
Reviewed-by: Breno Leitao <[email protected]>
Tested-by: Mario Casquero <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Shuah Khan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions