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

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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;
}