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

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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
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2
tools/testing/selftests/mm/vm_util.h
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@@ -44,6 +44,8 @@ static inline unsigned int pshift(void)
return __page_shift;
}
bool detect_huge_zeropage(void);
/*
* Plan 9 FS has bugs (at least on QEMU) where certain operations fail with
* ENOENT on unlinked files. See