Message ID | 20241102104235.62560-6-yangyicong@huawei.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show |
Series | Support Armv8.9/v9.4 FEAT_HAFT | expand |
On Sat, Nov 02, 2024 at 06:42:35PM +0800, Yicong Yang wrote: > From: Yicong Yang <yangyicong@hisilicon.com> > > 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>
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 5182feabd943..160ca503c99f 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -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 */