@@ -0,0 +1,31 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+#
+# Probe for libraries and create header files to record the results. Both C
+# header files and Makefile include fragments are created.
+
+OUTPUT_H_FILE=local_config.h
+OUTPUT_MKFILE=local_config.mk
+
+# libhugetlbfs
+tmpname=$(mktemp)
+tmpfile_c=${tmpname}.c
+tmpfile_o=${tmpname}.o
+
+echo "#include <sys/types.h>" > $tmpfile_c
+echo "#include <hugetlbfs.h>" >> $tmpfile_c
+echo "int func(void) { return 0; }" >> $tmpfile_c
+
+CC=${1:?"Usage: $0 <compiler> # example compiler: gcc"}
+$CC -c $tmpfile_c -o $tmpfile_o >/dev/null 2>&1
+
+if [ -f $tmpfile_o ]; then
+ echo "#define LOCAL_CONFIG_HAVE_LIBHUGETLBFS 1" > $OUTPUT_H_FILE
+ echo "HMM_EXTRA_LIBS = -lhugetlbfs" > $OUTPUT_MKFILE
+else
+ echo "// No libhugetlbfs support found" > $OUTPUT_H_FILE
+ echo "# No libhugetlbfs support found, so:" > $OUTPUT_MKFILE
+ echo "HMM_EXTRA_LIBS = " >> $OUTPUT_MKFILE
+fi
+
+rm ${tmpname}.*
@@ -20,3 +20,4 @@ va_128TBswitch
map_fixed_noreplace
write_to_hugetlbfs
hmm-tests
+local_config.*
@@ -21,12 +21,16 @@
#include <strings.h>
#include <time.h>
#include <pthread.h>
-#include <hugetlbfs.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
+#include "./local_config.h"
+#ifdef LOCAL_CONFIG_HAVE_LIBHUGETLBFS
+#include <hugetlbfs.h>
+#endif
+
/*
* This is a private UAPI to the kernel test module so it isn't exported
* in the usual include/uapi/... directory.
@@ -662,6 +666,7 @@ TEST_F(hmm, anon_write_huge)
hmm_buffer_free(buffer);
}
+#ifdef LOCAL_CONFIG_HAVE_LIBHUGETLBFS
/*
* Write huge TLBFS page.
*/
@@ -720,6 +725,7 @@ TEST_F(hmm, anon_write_hugetlbfs)
buffer->ptr = NULL;
hmm_buffer_free(buffer);
}
+#endif /* LOCAL_CONFIG_HAVE_LIBHUGETLBFS */
/*
* Read mmap'ed file memory.
@@ -1336,6 +1342,7 @@ TEST_F(hmm2, snapshot)
hmm_buffer_free(buffer);
}
+#ifdef LOCAL_CONFIG_HAVE_LIBHUGETLBFS
/*
* Test the hmm_range_fault() HMM_PFN_PMD flag for large pages that
* should be mapped by a large page table entry.
@@ -1411,6 +1418,7 @@ TEST_F(hmm, compound)
buffer->ptr = NULL;
hmm_buffer_free(buffer);
}
+#endif /* LOCAL_CONFIG_HAVE_LIBHUGETLBFS */
/*
* Test two devices reading the same memory (double mapped).
@@ -1,5 +1,8 @@
# SPDX-License-Identifier: GPL-2.0
# Makefile for vm selftests
+
+include local_config.mk
+
uname_M := $(shell uname -m 2>/dev/null || echo not)
MACHINE ?= $(shell echo $(uname_M) | sed -e 's/aarch64.*/arm64/')
@@ -76,8 +79,6 @@ TEST_FILES := test_vmalloc.sh
KSFT_KHDR_INSTALL := 1
include ../lib.mk
-$(OUTPUT)/hmm-tests: LDLIBS += -lhugetlbfs
-
ifeq ($(ARCH),x86_64)
BINARIES_32 := $(patsubst %,$(OUTPUT)/%,$(BINARIES_32))
BINARIES_64 := $(patsubst %,$(OUTPUT)/%,$(BINARIES_64))
@@ -130,3 +131,22 @@ endif
$(OUTPUT)/mlock-random-test: LDLIBS += -lcap
$(OUTPUT)/gup_test: ../../../../mm/gup_test.h
+
+$(OUTPUT)/hmm-tests: local_config.h
+
+# HMM_EXTRA_LIBS may get set in local_config.mk, or it may be left empty.
+$(OUTPUT)/hmm-tests: LDLIBS += $(HMM_EXTRA_LIBS)
+
+local_config.mk local_config.h: check_config.sh
+ /bin/sh ./check_config.sh $(CC)
+
+EXTRA_CLEAN += local_config.mk local_config.h
+
+ifeq ($(HMM_EXTRA_LIBS),)
+all: warn_missing_hugelibs
+
+warn_missing_hugelibs:
+ @echo ; \
+ echo "Warning: missing libhugetlbfs support. Some HMM tests will be skipped." ; \
+ echo
+endif