diff options
| author | Yicong Yang <yangyicong@hisilicon.com> | 2024-11-02 11:42:35 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2024-11-05 14:21:14 +0100 |
| commit | b349a5a2b6e236b25095c6ff886b3451de5ea041 (patch) | |
| tree | 7a625cdfb35567509527f2622b83ef9a66e4f27f /arch | |
| parent | arm64: Enable ARCH_HAS_NONLEAF_PMD_YOUNG (diff) | |
| download | linux-b349a5a2b6e236b25095c6ff886b3451de5ea041.tar.xz linux-b349a5a2b6e236b25095c6ff886b3451de5ea041.zip | |
arm64: pgtable: Warn unexpected pmdp_test_and_clear_young()
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/include/asm/pgtable.h | 2 |
1 files changed, 2 insertions, 0 deletions
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 */ |