diff options
Diffstat (limited to 'include/linux/leafops.h')
| -rw-r--r-- | include/linux/leafops.h | 39 |
1 files changed, 35 insertions, 4 deletions
diff --git a/include/linux/leafops.h b/include/linux/leafops.h index 05673d3529e7..992cd8bd8ed0 100644 --- a/include/linux/leafops.h +++ b/include/linux/leafops.h @@ -607,7 +607,20 @@ static inline bool pmd_is_migration_entry(pmd_t pmd) } /** - * pmd_is_valid_softleaf() - Is this PMD entry a valid leaf entry? + * softleaf_is_valid_pmd_entry() - Is the specified softleaf entry obtained from + * a PMD one that we support at PMD level? + * @entry: Entry to check. + * Returns: true if the softleaf entry is valid at PMD, otherwise false. + */ +static inline bool softleaf_is_valid_pmd_entry(softleaf_t entry) +{ + /* Only device private, migration entries valid for PMD. */ + return softleaf_is_device_private(entry) || + softleaf_is_migration(entry); +} + +/** + * pmd_is_valid_softleaf() - Is this PMD entry a valid softleaf entry? * @pmd: PMD entry. * * PMD leaf entries are valid only if they are device private or migration @@ -620,9 +633,27 @@ static inline bool pmd_is_valid_softleaf(pmd_t pmd) { const softleaf_t entry = softleaf_from_pmd(pmd); - /* Only device private, migration entries valid for PMD. */ - return softleaf_is_device_private(entry) || - softleaf_is_migration(entry); + return softleaf_is_valid_pmd_entry(entry); +} + +/** + * pmd_to_softleaf_folio() - Convert the PMD entry to a folio. + * @pmd: PMD entry. + * + * The PMD entry is expected to be a valid PMD softleaf entry. + * + * Returns: the folio the softleaf entry references if this is a valid softleaf + * entry, otherwise NULL. + */ +static inline struct folio *pmd_to_softleaf_folio(pmd_t pmd) +{ + const softleaf_t entry = softleaf_from_pmd(pmd); + + if (!softleaf_is_valid_pmd_entry(entry)) { + VM_WARN_ON_ONCE(true); + return NULL; + } + return softleaf_to_folio(entry); } #endif /* CONFIG_MMU */ |