git/linux-cryptodev-2.6
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git synced 2026-04-23 05:56:14 -04:00
Code Issues Packages Projects Releases Wiki Activity

selftests/mm: pagemap_scan ioctl: add PFN ZERO test cases

Browse Source 
Add test cases to test the correctness of PFN ZERO flag of pagemap_scan
ioctl.  Test with normal pages backed memory and huge pages backed memory.

Link: https://lkml.kernel.org/r/20250707073321.106431-1-usama.anjum@collabora.com
Signed-off-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Muhammad Usama Anjum <usama.anjum@collabora.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Muhammad Usama Anjum
2025-07-07 12:33:20 +05:00
committed by Andrew Morton
parent 0b473f9e6e
commit f73858d5ef
4 changed files with 95 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
tools/testing/selftests/mm/vm_util.c
View File

@@ -532,3 +532,26 @@ void *sys_mremap(void *old_address, unsigned long old_size,
old_size, new_size, flags,
(unsigned long)new_address);
}
bool detect_huge_zeropage(void)
{
int fd = open("/sys/kernel/mm/transparent_hugepage/use_zero_page",
O_RDONLY);
bool enabled = 0;
char buf[15];
int ret;
if (fd < 0)
return 0;
ret = pread(fd, buf, sizeof(buf), 0);
if (ret > 0 && ret < sizeof(buf)) {
buf[ret] = 0;
if (strtoul(buf, NULL, 10) == 1)
enabled = 1;
}
close(fd);
return enabled;
}