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Kselftests: remove support of libhugetlbfs from kselftests 

libhugetlbfs, the user side utitlity to work with hugepages, does not have
any active support.  There are only 2 selftests which are part of in
vm/hmm_test.c that depends on libhugetlbfs.

This patch modifies the tests so that they will not require libhugetlb
library.

[axelrasmussen@google.com: : remove orphaned references to local_config.{h,mk}]
  Link: https://lkml.kernel.org/r/20220831211526.2743216-1-axelrasmussen@google.com
Link: https://lkml.kernel.org/r/20220801070231.13831-1-tsahu@linux.ibm.com
Signed-off-by: Tarun Sahu <tsahu@linux.ibm.com>
Signed-off-by: Axel Rasmussen <axelrasmussen@google.com>
Tested-by: Zach O'Keefe <zokeefe@google.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Vaibhav Jain <vaibhav@linux.ibm.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Tarun Sahu 2022-08-01 12:32:31 +05:30 committed by Andrew Morton
parent b84e04f1ba
commit 6f83d6c74e
3 changed files with 74 additions and 86 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
tools/testing/selftests/vm/Makefile
View File

@ -1,9 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
# Makefile for vm selftests
LOCAL_HDRS += $(selfdir)/vm/local_config.h $(top_srcdir)/mm/gup_test.h
include local_config.mk
LOCAL_HDRS += $(top_srcdir)/mm/gup_test.h
uname_M := $(shell uname -m 2>/dev/null || echo not)
MACHINE ?= $(shell echo $(uname_M) | sed -e 's/aarch64.*/arm64/' -e 's/ppc64.*/ppc64/')
@ -152,23 +150,6 @@ endif
$(OUTPUT)/mlock-random-test $(OUTPUT)/memfd_secret: LDLIBS += -lcap
# HMM_EXTRA_LIBS may get set in local_config.mk, or it may be left empty.
$(OUTPUT)/hmm-tests: LDLIBS += $(HMM_EXTRA_LIBS)
$(OUTPUT)/ksm_tests: LDLIBS += -lnuma
$(OUTPUT)/migration: LDLIBS += -lnuma
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

31
tools/testing/selftests/vm/check_config.sh
View File

@ -1,31 +0,0 @@
#!/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}.*

108
tools/testing/selftests/vm/hmm-tests.c
View File

@ -26,10 +26,6 @@
#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
@ -733,7 +729,54 @@ TEST_F(hmm, anon_write_huge)
hmm_buffer_free(buffer);
}
#ifdef LOCAL_CONFIG_HAVE_LIBHUGETLBFS
/*
* Read numeric data from raw and tagged kernel status files. Used to read
* /proc and /sys data (without a tag) and from /proc/meminfo (with a tag).
*/
static long file_read_ulong(char *file, const char *tag)
{
int fd;
char buf[2048];
int len;
char *p, *q;
long val;
fd = open(file, O_RDONLY);
if (fd < 0) {
/* Error opening the file */
return -1;
}
len = read(fd, buf, sizeof(buf));
close(fd);
if (len < 0) {
/* Error in reading the file */
return -1;
}
if (len == sizeof(buf)) {
/* Error file is too large */
return -1;
}
buf[len] = '\0';
/* Search for a tag if provided */
if (tag) {
p = strstr(buf, tag);
if (!p)
return -1; /* looks like the line we want isn't there */
p += strlen(tag);
} else
p = buf;
val = strtol(p, &q, 0);
if (*q != ' ') {
/* Error parsing the file */
return -1;
}
return val;
}
/*
* Write huge TLBFS page.
*/
@ -742,29 +785,27 @@ TEST_F(hmm, anon_write_hugetlbfs)
struct hmm_buffer *buffer;
unsigned long npages;
unsigned long size;
unsigned long default_hsize;
unsigned long i;
int *ptr;
int ret;
long pagesizes[4];
int n, idx;
/* Skip test if we can't allocate a hugetlbfs page. */
n = gethugepagesizes(pagesizes, 4);
if (n <= 0)
default_hsize = file_read_ulong("/proc/meminfo", "Hugepagesize:");
if (default_hsize < 0 || default_hsize*1024 < default_hsize)
SKIP(return, "Huge page size could not be determined");
for (idx = 0; --n > 0; ) {
if (pagesizes[n] < pagesizes[idx])
idx = n;
}
size = ALIGN(TWOMEG, pagesizes[idx]);
default_hsize = default_hsize*1024; /* KB to B */
size = ALIGN(TWOMEG, default_hsize);
npages = size >> self->page_shift;
buffer = malloc(sizeof(*buffer));
ASSERT_NE(buffer, NULL);
buffer->ptr = get_hugepage_region(size, GHR_STRICT);
if (buffer->ptr == NULL) {
buffer->ptr = mmap(NULL, size,
PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB,
-1, 0);
if (buffer->ptr == MAP_FAILED) {
free(buffer);
SKIP(return, "Huge page could not be allocated");
}
@ -788,11 +829,10 @@ TEST_F(hmm, anon_write_hugetlbfs)
for (i = 0, ptr = buffer->ptr; i < size / sizeof(*ptr); ++i)
ASSERT_EQ(ptr[i], i);
free_hugepage_region(buffer->ptr);
munmap(buffer->ptr, buffer->size);
buffer->ptr = NULL;
hmm_buffer_free(buffer);
}
#endif /* LOCAL_CONFIG_HAVE_LIBHUGETLBFS */
/*
* Read mmap'ed file memory.
@ -1467,7 +1507,6 @@ 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.
@ -1477,30 +1516,30 @@ TEST_F(hmm, compound)
struct hmm_buffer *buffer;
unsigned long npages;
unsigned long size;
unsigned long default_hsize;
int *ptr;
unsigned char *m;
int ret;
long pagesizes[4];
int n, idx;
unsigned long i;
/* Skip test if we can't allocate a hugetlbfs page. */
n = gethugepagesizes(pagesizes, 4);
if (n <= 0)
return;
for (idx = 0; --n > 0; ) {
if (pagesizes[n] < pagesizes[idx])
idx = n;
}
size = ALIGN(TWOMEG, pagesizes[idx]);
default_hsize = file_read_ulong("/proc/meminfo", "Hugepagesize:");
if (default_hsize < 0 || default_hsize*1024 < default_hsize)
SKIP(return, "Huge page size could not be determined");
default_hsize = default_hsize*1024; /* KB to B */
size = ALIGN(TWOMEG, default_hsize);
npages = size >> self->page_shift;
buffer = malloc(sizeof(*buffer));
ASSERT_NE(buffer, NULL);
buffer->ptr = get_hugepage_region(size, GHR_STRICT);
if (buffer->ptr == NULL) {
buffer->ptr = mmap(NULL, size,
PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB,
-1, 0);
if (buffer->ptr == MAP_FAILED) {
free(buffer);
return;
}
@ -1539,11 +1578,10 @@ TEST_F(hmm, compound)
ASSERT_EQ(m[i], HMM_DMIRROR_PROT_READ |
HMM_DMIRROR_PROT_PMD);
free_hugepage_region(buffer->ptr);
munmap(buffer->ptr, buffer->size);
buffer->ptr = NULL;
hmm_buffer_free(buffer);
}
#endif /* LOCAL_CONFIG_HAVE_LIBHUGETLBFS */
/*
* Test two devices reading the same memory (double mapped).