Dereferencing a null pointer on Clang is not a good idea - it will
entirely optimise out the dereference. Make the pointer volatile to
force the access (and fault).

Reported-by: kernel test robot <redacted>
Closes: https://lore.kernel.org/oe-kbuild-all/202412140850.4TW4YBqc-lkp@intel.com/ (local)
Signed-off-by: Kevin Brodsky <redacted>
---

Hi Andrew,

Another fixup for an issue reported by the LKP CI (building with Clang
instead of GCC). This should be squashed into the patch I'm replying to:
"selftests/mm: Fix -Warray-bounds warnings in pkey_sighandler_tests"

Cheers,
- Kevin

Cc: aruna.ramakrishna@oracle.com
Cc: catalin.marinas@arm.com
Cc: dave.hansen@linux.intel.com
Cc: joey.gouly@arm.com
Cc: keith.lucas@oracle.com
Cc: ryan.roberts@arm.com
Cc: shuah@kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kselftest@vger.kernel.org
Cc: linux-mm@kvack.org
Cc: x86@kernel.org
---
 tools/testing/selftests/mm/pkey_sighandler_tests.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/mm/pkey_sighandler_tests.c b/tools/testing/selftests/mm/pkey_sighandler_tests.c
index 17bbfcd552c6..1ac8c8809880 100644
--- a/tools/testing/selftests/mm/pkey_sighandler_tests.c
+++ b/tools/testing/selftests/mm/pkey_sighandler_tests.c

@@ -161,7 +161,7 @@ static void *thread_segv_with_pkey0_disabled(void *ptr)
 	__write_pkey_reg(pkey_reg_restrictive_default());
 
 	/* Segfault (with SEGV_MAPERR) */
-	*(int *)NULL = 1;
+	*(volatile int *)NULL = 1;
 	return NULL;
 }
 

@@ -192,7 +192,7 @@ static void *thread_segv_maperr_ptr(void *ptr)
 	__write_pkey_reg(pkey_reg);
 
 	/* Segfault */
-	*(int *)NULL = 1;
+	*(volatile int *)NULL = 1;
 	syscall_raw(SYS_exit, 0, 0, 0, 0, 0, 0);
 	return NULL;
 }

-- 
2.47.0