selftests: vm: pkeys: use the correct huge page size

The huge page size can vary across architectures.  This will ensure that
the correct huge page size is used when accessing the hugetlb controls
under sysfs.  Instead of using a hardcoded page size (i.e.  2MB), this now
uses the HPAGE_SIZE macro which is arch-specific.

Signed-off-by: Sandipan Das <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Acked-by: Dave Hansen <[email protected]>
Cc: "Desnes A. Nunes do Rosario" <[email protected]>
Cc: Florian Weimer <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Ram Pai <[email protected]>
Cc: Thiago Jung Bauermann <[email protected]>
Cc: "Aneesh Kumar K.V" <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Michal Suchanek <[email protected]>
Cc: Shuah Khan <[email protected]>
Link: http://lkml.kernel.org/r/66882a5d6e45c73c3a52bc4aef9754e48afa4f88.1585646528.git.sandipan@linux.ibm.com
Signed-off-by: Linus Torvalds <[email protected]>

Author: sandip4n

tools/testing/selftests/vm/protection_keys.c

@@ -739,12 +739,15 @@ void *malloc_pkey_anon_huge(long size, int prot, u16 pkey)
 }
 
 int hugetlb_setup_ok;
+#define SYSFS_FMT_NR_HUGE_PAGES "/sys/kernel/mm/hugepages/hugepages-%ldkB/nr_hugepages"
 #define GET_NR_HUGE_PAGES 10
 void setup_hugetlbfs(void)
 {
 	int err;
 	int fd;
-	char buf[] = "123";
+	char buf[256];
+	long hpagesz_kb;
+	long hpagesz_mb;
 
 	if (geteuid() != 0) {
 		fprintf(stderr, "WARNING: not run as root, can not do hugetlb test\n");
@@ -755,25 +758,31 @@ void setup_hugetlbfs(void)
 
 	/*
 	 * Now go make sure that we got the pages and that they
-	 * are 2M pages.  Someone might have made 1G the default.
+	 * are PMD-level pages. Someone might have made PUD-level
+	 * pages the default.
 	 */
-	fd = open("/sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages", O_RDONLY);
+	hpagesz_kb = HPAGE_SIZE / 1024;
+	hpagesz_mb = hpagesz_kb / 1024;
+	sprintf(buf, SYSFS_FMT_NR_HUGE_PAGES, hpagesz_kb);
+	fd = open(buf, O_RDONLY);
 	if (fd < 0) {
-		perror("opening sysfs 2M hugetlb config");
+		fprintf(stderr, "opening sysfs %ldM hugetlb config: %s\n",
+			hpagesz_mb, strerror(errno));
 		return;
 	}
 
 	/* -1 to guarantee leaving the trailing \0 */
 	err = read(fd, buf, sizeof(buf)-1);
 	close(fd);
 	if (err <= 0) {
-		perror("reading sysfs 2M hugetlb config");
+		fprintf(stderr, "reading sysfs %ldM hugetlb config: %s\n",
+			hpagesz_mb, strerror(errno));
 		return;
 	}
 
 	if (atoi(buf) != GET_NR_HUGE_PAGES) {
-		fprintf(stderr, "could not confirm 2M pages, got: '%s' expected %d\n",
-			buf, GET_NR_HUGE_PAGES);
+		fprintf(stderr, "could not confirm %ldM pages, got: '%s' expected %d\n",
+			hpagesz_mb, buf, GET_NR_HUGE_PAGES);
 		return;
 	}