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selftests/mm: use generic read_sysfs in thuge-gen test

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As generic read_sysfs is available in vm_utils, let's use is in thuge-gen
test.

Link: https://lkml.kernel.org/r/20250611100106.1331197-1-pulehui@huaweicloud.com
Signed-off-by: Pu Lehui <pulehui@huawei.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Pu Lehui 2025-06-11 10:01:06 +00:00 committed by Andrew Morton
parent 4f8ba33bbd
commit a788b6e571
1 changed files with 13 additions and 31 deletions
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44
tools/testing/selftests/mm/thuge-gen.c
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@ -77,38 +77,18 @@ void show(unsigned long ps)
system(buf);
}
unsigned long thuge_read_sysfs(int warn, char *fmt, ...)
{
char *line = NULL;
size_t linelen = 0;
char buf[100];
FILE *f;
va_list ap;
unsigned long val = 0;
va_start(ap, fmt);
vsnprintf(buf, sizeof buf, fmt, ap);
va_end(ap);
f = fopen(buf, "r");
if (!f) {
if (warn)
ksft_print_msg("missing %s\n", buf);
return 0;
}
if (getline(&line, &linelen, f) > 0) {
sscanf(line, "%lu", &val);
}
fclose(f);
free(line);
return val;
}
unsigned long read_free(unsigned long ps)
{
return thuge_read_sysfs(ps != getpagesize(),
"/sys/kernel/mm/hugepages/hugepages-%lukB/free_hugepages",
ps >> 10);
unsigned long val = 0;
char buf[100];
snprintf(buf, sizeof(buf),
"/sys/kernel/mm/hugepages/hugepages-%lukB/free_hugepages",
ps >> 10);
if (read_sysfs(buf, &val) && ps != getpagesize())
ksft_print_msg("missing %s\n", buf);
return val;
}
void test_mmap(unsigned long size, unsigned flags)
@ -173,6 +153,7 @@ void test_shmget(unsigned long size, unsigned flags)
void find_pagesizes(void)
{
unsigned long largest = getpagesize();
unsigned long shmmax_val = 0;
int i;
glob_t g;
@ -195,7 +176,8 @@ void find_pagesizes(void)
}
globfree(&g);
if (thuge_read_sysfs(0, "/proc/sys/kernel/shmmax") < NUM_PAGES * largest)
read_sysfs("/proc/sys/kernel/shmmax", &shmmax_val);
if (shmmax_val < NUM_PAGES * largest)
ksft_exit_fail_msg("Please do echo %lu > /proc/sys/kernel/shmmax",
largest * NUM_PAGES);