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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 <sandipan@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Dave Hansen <dave.hansen@intel.com>
Cc: "Desnes A. Nunes do Rosario" <desnesn@linux.vnet.ibm.com>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Ram Pai <linuxram@us.ibm.com>
Cc: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Michal Suchanek <msuchanek@suse.de>
Cc: Shuah Khan <shuah@kernel.org>
Link: http://lkml.kernel.org/r/66882a5d6e45c73c3a52bc4aef9754e48afa4f88.1585646528.git.sandipan@linux.ibm.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sandipan Das 2020-06-04 16:52:08 -07:00 committed by Linus Torvalds
parent 6e373263ce
commit 57bcb57da2
1 changed files with 16 additions and 7 deletions
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23
tools/testing/selftests/vm/protection_keys.c
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@ -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");
@ -755,11 +758,16 @@ 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;
}
@ -767,13 +775,14 @@ void setup_hugetlbfs(void)
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;
}