selftests: complete kselftest include centralization

This follow-up patch completes centralization of kselftest.h and
ksefltest_harness.h includes in remaining seltests files, replacing all
relative paths with a non-relative paths using shared -I include path in
lib.mk

Tested with gcc-13.3 and clang-18.1, and cross-compiled successfully on
riscv, arm64, x86_64 and powerpc arch.

[reddybalavignesh9979@gmail.com: add selftests include path for kselftest.h]
  Link: https://lkml.kernel.org/r/20251017090201.317521-1-reddybalavignesh9979@gmail.com
Link: https://lkml.kernel.org/r/20251016104409.68985-1-reddybalavignesh9979@gmail.com
Signed-off-by: Bala-Vignesh-Reddy <reddybalavignesh9979@gmail.com>
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Link: https://lore.kernel.org/lkml/20250820143954.33d95635e504e94df01930d0@linux-foundation.org/
Reviewed-by: Wei Yang <richard.weiyang@gmail.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Günther Noack <gnoack@google.com>
Cc: Jakub Kacinski <kuba@kernel.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mickael Salaun <mic@digikod.net>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Simon Horman <horms@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

samples/vfs/Makefile

@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0-only
 userprogs-always-y += test-fsmount test-statx mountinfo test-list-all-mounts
 
+userccflags += -I $(srctree)/tools/testing/selftests/
 userccflags += -I usr/include

tools/testing/selftests/acct/acct_syscall.c

@@ -9,7 +9,7 @@
 #include <string.h>
 #include <sys/wait.h>
 
-#include "../kselftest.h"
+#include "kselftest.h"
 
 int main(void)
 {

tools/testing/selftests/alsa/conf.c

@@ -14,7 +14,7 @@
 #include <regex.h>
 #include <sys/stat.h>
 
-#include "../kselftest.h"
+#include "kselftest.h"
 #include "alsa-local.h"
 
 #define SYSFS_ROOT "/sys"

tools/testing/selftests/alsa/mixer-test.c

@@ -25,7 +25,7 @@
 #include <poll.h>
 #include <stdint.h>
 
-#include "../kselftest.h"
+#include "kselftest.h"
 #include "alsa-local.h"
 
 #define TESTS_PER_CONTROL 7

tools/testing/selftests/alsa/pcm-test.c

@@ -17,7 +17,7 @@
 #include <assert.h>
 #include <pthread.h>
 
-#include "../kselftest.h"
+#include "kselftest.h"
 #include "alsa-local.h"
 
 typedef struct timespec timestamp_t;

tools/testing/selftests/alsa/test-pcmtest-driver.c

@@ -7,7 +7,7 @@
  */
 #include <string.h>
 #include <alsa/asoundlib.h>
-#include "../kselftest_harness.h"
+#include "kselftest_harness.h"
 
 #define CH_NUM 4
 

tools/testing/selftests/alsa/utimer-test.c

@@ -6,7 +6,7 @@
  *
  * Author: Ivan Orlov <ivan.orlov0322@gmail.com>
  */
-#include "../kselftest_harness.h"
+#include "kselftest_harness.h"
 #include <sound/asound.h>
 #include <unistd.h>
 #include <fcntl.h>

tools/testing/selftests/arm64/abi/hwcap.c

@@ -19,7 +19,7 @@
 
 #include <linux/auxvec.h>
 
-#include "../../kselftest.h"
+#include "kselftest.h"
 
 #define TESTS_PER_HWCAP 3
 

tools/testing/selftests/arm64/abi/ptrace.c

@@ -18,7 +18,7 @@
 #include <asm/sigcontext.h>
 #include <asm/ptrace.h>
 
-#include "../../kselftest.h"
+#include "kselftest.h"
 
 #define EXPECTED_TESTS 11
 

tools/testing/selftests/arm64/abi/syscall-abi.c

@@ -16,7 +16,7 @@
 #include <asm/sigcontext.h>
 #include <asm/unistd.h>
 
-#include "../../kselftest.h"
+#include "kselftest.h"
 
 #include "syscall-abi.h"
 

tools/testing/selftests/arm64/fp/fp-ptrace.c

@@ -27,7 +27,7 @@
 #include <asm/sve_context.h>
 #include <asm/ptrace.h>
 
-#include "../../kselftest.h"
+#include "kselftest.h"
 
 #include "fp-ptrace.h"
 

tools/testing/selftests/arm64/fp/fp-stress.c

@@ -24,7 +24,7 @@
 #include <sys/wait.h>
 #include <asm/hwcap.h>
 
-#include "../../kselftest.h"
+#include "kselftest.h"
 
 #define MAX_VLS 16
 

tools/testing/selftests/arm64/fp/sve-probe-vls.c

@@ -12,7 +12,7 @@
 #include <sys/prctl.h>
 #include <asm/sigcontext.h>
 
-#include "../../kselftest.h"
+#include "kselftest.h"
 #include "rdvl.h"
 
 int main(int argc, char **argv)

tools/testing/selftests/arm64/fp/sve-ptrace.c

@@ -19,7 +19,7 @@
 #include <asm/sigcontext.h>
 #include <asm/ptrace.h>
 
-#include "../../kselftest.h"
+#include "kselftest.h"
 
 /* <linux/elf.h> and <sys/auxv.h> don't like each other, so: */
 #ifndef NT_ARM_SVE

tools/testing/selftests/arm64/fp/vec-syscfg.c

@@ -19,7 +19,7 @@
 #include <asm/sigcontext.h>
 #include <asm/hwcap.h>
 
-#include "../../kselftest.h"
+#include "kselftest.h"
 #include "rdvl.h"
 
 #define ARCH_MIN_VL SVE_VL_MIN

tools/testing/selftests/arm64/fp/za-ptrace.c

@@ -18,7 +18,7 @@
 #include <asm/sigcontext.h>
 #include <asm/ptrace.h>
 
-#include "../../kselftest.h"
+#include "kselftest.h"
 
 /* <linux/elf.h> and <sys/auxv.h> don't like each other, so: */
 #ifndef NT_ARM_ZA

tools/testing/selftests/arm64/fp/zt-ptrace.c

@@ -18,7 +18,7 @@
 #include <asm/sigcontext.h>
 #include <asm/ptrace.h>
 
-#include "../../kselftest.h"
+#include "kselftest.h"
 
 /* <linux/elf.h> and <sys/auxv.h> don't like each other, so: */
 #ifndef NT_ARM_ZA

tools/testing/selftests/arm64/gcs/gcs-stress.c

@@ -24,7 +24,7 @@
 #include <sys/wait.h>
 #include <asm/hwcap.h>
 
-#include "../../kselftest.h"
+#include "kselftest.h"
 
 struct child_data {
 	char *name, *output;

tools/testing/selftests/arm64/pauth/pac.c

@@ -10,7 +10,7 @@
 #include <setjmp.h>
 #include <sched.h>
 
-#include "../../kselftest_harness.h"
+#include "kselftest_harness.h"
 #include "helper.h"
 
 #define PAC_COLLISION_ATTEMPTS 1000

tools/testing/selftests/arm64/tags/tags_test.c

@@ -6,7 +6,7 @@
 #include <stdint.h>
 #include <sys/prctl.h>
 #include <sys/utsname.h>
-#include "../../kselftest.h"
+#include "kselftest.h"
 
 #define SHIFT_TAG(tag)		((uint64_t)(tag) << 56)
 #define SET_TAG(ptr, tag)	(((uint64_t)(ptr) & ~SHIFT_TAG(0xff)) | \