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arm64: pgtable: Warn unexpected pmdp_test_and_clear_young()

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Young bit operation on PMD table entry is only supported if
FEAT_HAFT enabled system wide. Add a warning for notifying
the misbehaviour.

Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20241102104235.62560-6-yangyicong@huawei.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Yicong Yang 2024-11-02 18:42:35 +08:00 committed by Catalin Marinas
parent 62df5870eb
commit b349a5a2b6
1 changed files with 2 additions and 0 deletions
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2
arch/arm64/include/asm/pgtable.h
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@ -1265,6 +1265,8 @@ static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
unsigned long address,
pmd_t *pmdp)
{
/* Operation applies to PMD table entry only if FEAT_HAFT is enabled */
VM_WARN_ON(pmd_table(READ_ONCE(*pmdp)) && !system_supports_haft());
return __ptep_test_and_clear_young(vma, address, (pte_t *)pmdp);
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_ARCH_HAS_NONLEAF_PMD_YOUNG */