selftests/mm: move hwpoison setup into run_test() and silence modprobe output for memory-failure category

run_vmtests.sh contains special handling to ensure the hwpoison_inject
module is available for the memory-failure tests.  This logic was
implemented outside of run_test(), making the setup category-specific but
managed globally.

Move the hwpoison_inject handling into run_test() and restrict it
to the memory-failure category so that:
1. the module is checked and loaded only when memory-failure tests run,
2. the test is skipped if the module or the debugfs interface
(/sys/kernel/debug/hwpoison/) is not available.
3. the module is unloaded after the test if it was loaded by the script.

This localizes category-specific setup and makes the test flow
consistent with other per-category preparations.

While updating this logic, fix the module availability check.
The script previously used:

        modprobe -R hwpoison_inject

The -R option prints the resolved module name to stdout, causing every
run to print:

        hwpoison_inject

in the test output, even when no action is required, introducing
unnecessary noise.

Replace this with:

        modprobe -n hwpoison_inject

which verifies that the module is loadable without producing output,
keeping the selftest logs clean and consistent.

Also, ensure that skipped tests do not override a previously recorded
failure.  A skipped test currently sets exitcode to ksft_skip even if a
prior test has failed, which can mask failures in the final exit status. 
Update the logic to only set exitcode to ksft_skip when no failure has
been recorded.

Link: https://lore.kernel.org/93441f34f7ef5add47d1a130d03daa79e21b5050.1779296493.git.sayalip@linux.ibm.com
Fixes: ff4ef2fbd101 ("selftests/mm: add memory failure anonymous page test")
Signed-off-by: Sayali Patil <sayalip@linux.ibm.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Cc: David Hildenbrand (Arm) <david@kernel.org>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

0 files changed, 0 insertions, 0 deletions