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Howlett , ryan.roberts@arm.com, Vlastimil Babka , lance.yang@linux.dev, linux-kernel@vger.kernel.org, nphamcs@gmail.com, shikemeng@huaweicloud.com, yosry@kernel.org, qi.zheng@linux.dev, luizcap@redhat.com, kernel-team@meta.com, Usama Arif , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , linux-s390@vger.kernel.org Subject: [PATCH v9 06/32] s390: mm: add PMD swap-exclusive helpers Date: Thu, 5 Nov 2026 10:38:50 -0800 Message-ID: <20261105183940.2236717-7-usama.arif@linux.dev> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261105183940.2236717-1-usama.arif@linux.dev> References: <20261105183940.2236717-1-usama.arif@linux.dev> X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam06 X-Stat-Signature: 7fm19p8wtu51eyn8oo159gdbjhy48wce X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-Rspamd-Queue-Id: 4489D1A0006 X-Rspam-User: X-HE-Tag: 1793904039-182673 X-HE-Meta: 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 ZZxtMe8w XtkbmjwfWow1qcaQ5I5PLufdN4PSxil1b6L77yBH3dxACY+4etAzC6le/g7YI2ooIPws7eOEpQms4DYorEapG70qQJt9vVIBBO6ulUYWC4kHcsbFhW0ykZ6E9G04lq4frkolCOlcqpPzvOObxpBHAeOl48cKmR7RplA241l/KYbJZFQ39+n2LWhHL84abZD8oea+07V+GhA+bq3rBedgzfgyV1MmoFe8Ua5aHhXxJAo6YOKVdxp57fWt8nZ/Y0pcrvhH+6CncAhQcfu5Woc7Py0sDmQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 Prepare for keeping a PMD-mapped anonymous THP mapped by a PMD across the swap round-trip, which makes PG_anon_exclusive have to survive in a swap PMD and not just in a swap PTE. s390 is the one architecture where a swap PMD is not a swap PTE in disguise: it is an RSTE with its own layout, converted to a fake PTE swap entry for the common code. Give it its own exclusive bit rather than borrowing the PTE-format macro, and document it in the RSTE swap layout, where bit 52 was listed as unused. Cc: Alexander Gordeev Cc: Gerald Schaefer Cc: Heiko Carstens Cc: Vasily Gorbik Cc: linux-s390@vger.kernel.org Signed-off-by: Usama Arif --- arch/s390/include/asm/pgtable.h | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h index 2d5c2ab06de98..2c6b5205ee3bc 100644 --- a/arch/s390/include/asm/pgtable.h +++ b/arch/s390/include/asm/pgtable.h @@ -333,6 +333,7 @@ void setup_protection_map(void); /* Common bits in region and segment table entries, for swap entries */ #define _RST_ENTRY_COMM 0x0010 /* Common-Region/Segment, marks swap entry */ #define _RST_ENTRY_INVALID 0x0020 /* invalid region/segment table entry */ +#define _RST_ENTRY_SWP_EXCLUSIVE 0x0800 /* SW exclusive swap bit, see mk_swap_rste() */ #define _CRST_ENTRIES 2048 /* number of region/segment table entries */ #define _PAGE_ENTRIES 256 /* number of page table entries */ @@ -893,6 +894,21 @@ static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd) } #ifdef CONFIG_ARCH_HAS_PMD_SOFTLEAVES +static inline bool pmd_swp_exclusive(pmd_t pmd) +{ + return pmd_val(pmd) & _RST_ENTRY_SWP_EXCLUSIVE; +} + +static inline pmd_t pmd_swp_mkexclusive(pmd_t pmd) +{ + return set_pmd_bit(pmd, __pgprot(_RST_ENTRY_SWP_EXCLUSIVE)); +} + +static inline pmd_t pmd_swp_clear_exclusive(pmd_t pmd) +{ + return clear_pmd_bit(pmd, __pgprot(_RST_ENTRY_SWP_EXCLUSIVE)); +} + #define pmd_swp_soft_dirty(pmd) pmd_soft_dirty(pmd) #define pmd_swp_mksoft_dirty(pmd) pmd_mksoft_dirty(pmd) #define pmd_swp_clear_soft_dirty(pmd) pmd_clear_soft_dirty(pmd) @@ -1900,15 +1916,15 @@ static inline swp_entry_t __swp_entry(unsigned long type, unsigned long offset) * Bits 59 and 63 are used to indicate the swap entry. Bit 58 marks the rste * as invalid. * A swap entry is indicated by bit pattern (rste & 0x011) == 0x010 - * | offset |Xtype |11TT|S0| + * | offset |Etype |11TT|S0| * |0000000000111111111122222222223333333333444444444455|555555|5566|66| * |0123456789012345678901234567890123456789012345678901|234567|8901|23| * * Bits 0-51 store the offset. + * Bit 52 (E) is used to remember PG_anon_exclusive (_RST_ENTRY_SWP_EXCLUSIVE). * Bits 53-57 store the type. * Bit 62 (S) is used for softdirty tracking. * Bits 60-61 (TT) indicate the table type: 0x01 for REGION3 and 0x00 for SEGMENT. - * Bit 52 (X) is unused. */ #define __SWP_OFFSET_MASK_RSTE ((1UL << 52) - 1) -- 2.53.0-Meta