selftests: stop using KSFT_KHDR_INSTALL

Stop using the KSFT_KHDR_INSTALL flag as installing the kernel headers
from the kselftest Makefile is causing some issues. Instead, rely on
the headers to be installed directly by the top-level Makefile
"headers_install" make target prior to building kselftest.

Signed-off-by: Guillaume Tucker <[e-mail]>
Tested-by: Anders Roxell <[e-mail]>
Signed-off-by: Shuah Khan <[e-mail]>

tools/testing/selftests/arm64/mte/Makefile

···
 TEST_GEN_PROGS := $(PROGS)
 
 # Get Kernel headers installed and use them.
-KSFT_KHDR_INSTALL := 1
 else
     $(warning compiler "$(CC)" does not support the ARMv8.5 MTE extension.)
     $(warning test program "mte" will not be created.)

tools/testing/selftests/arm64/signal/Makefile

···
 TEST_GEN_PROGS := $(notdir $(PROGS))
 
 # Get Kernel headers installed and use them.
-KSFT_KHDR_INSTALL := 1
 
 # Including KSFT lib.mk here will also mangle the TEST_GEN_PROGS list
 # to account for any OUTPUT target-dirs optionally provided by

tools/testing/selftests/arm64/signal/test_signals.h

···
 #include <ucontext.h>
 
 /*
- * Using ARCH specific and sanitized Kernel headers installed by KSFT
- * framework since we asked for it by setting flag KSFT_KHDR_INSTALL
- * in our Makefile.
+ * Using ARCH specific and sanitized Kernel headers from the tree.
  */
 #include <asm/ptrace.h>
 #include <asm/hwcap.h>

tools/testing/selftests/drivers/s390x/uvdevice/Makefile

···
 TEST_GEN_PROGS := test_uvdevice
 
 top_srcdir ?= ../../../../../..
-KSFT_KHDR_INSTALL := 1
 khdr_dir = $(top_srcdir)/usr/include
 LINUX_TOOL_ARCH_INCLUDE = $(top_srcdir)/tools/arch/$(ARCH)/include
 

tools/testing/selftests/futex/functional/Makefile

···
 TEST_PROGS := run.sh
 
 top_srcdir = ../../../../..
-KSFT_KHDR_INSTALL := 1
 DEFAULT_INSTALL_HDR_PATH := 1
 include ../../lib.mk
 

tools/testing/selftests/kvm/Makefile

···
 all:
 
 top_srcdir = ../../../..
-KSFT_KHDR_INSTALL := 1
 
 # For cross-builds to work, UNAME_M has to map to ARCH and arch specific
 # directories and targets in this Makefile. "uname -m" doesn't map to

tools/testing/selftests/landlock/Makefile

···
 
 TEST_GEN_PROGS_EXTENDED := true
 
-KSFT_KHDR_INSTALL := 1
 OVERRIDE_TARGETS := 1
 include ../lib.mk
 

tools/testing/selftests/net/Makefile

···
 
 TEST_FILES := settings
 
-KSFT_KHDR_INSTALL := 1
 include ../lib.mk
 
 include bpf/Makefile

tools/testing/selftests/net/mptcp/Makefile

···
 # SPDX-License-Identifier: GPL-2.0
 
 top_srcdir = ../../../../..
-KSFT_KHDR_INSTALL := 1
 
 CFLAGS =  -Wall -Wl,--no-as-needed -O2 -g -I$(top_srcdir)/usr/include $(KHDR_INCLUDES)
 

tools/testing/selftests/tc-testing/Makefile

···
 APIDIR := $(top_scrdir)/include/uapi
 TEST_GEN_FILES = action.o
 
-KSFT_KHDR_INSTALL := 1
 include ../lib.mk
 
 PROBE := $(shell $(LLC) -march=bpf -mcpu=probe -filetype=null /dev/null 2>&1)

tools/testing/selftests/vm/Makefile

···
 TEST_FILES := test_vmalloc.sh
 TEST_FILES += test_hmm.sh
 
-KSFT_KHDR_INSTALL := 1
 include ../lib.mk
 
 $(OUTPUT)/madv_populate: vm_util.c