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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 , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org Subject: [RESEND v7 07/29] x86: mm: add PMD swap-exclusive helpers Date: Mon, 14 Sep 2026 05:27:57 -0700 Message-ID: <20260914122950.3283997-8-usama.arif@linux.dev> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260914122950.3283997-1-usama.arif@linux.dev> References: <20260914122950.3283997-1-usama.arif@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam04 X-Rspam-User: X-Stat-Signature: m7dpbr61qxmxwgx1hyhutdr3tz4bixsz X-Rspamd-Queue-Id: 4ADB320004 X-HE-Tag: 1789389068-322336 X-HE-Meta: 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 P/IrG9Fo 6Oh2X9cgkcgzMvuWBYrl0/+2WPNdAa5DdpLwet6/jLQlvlLlP1t9fEF581bKs/AfsMYWR2dSmAWSkZJLCIaJ+7/l+DBHG54ZJ6Q14P7cuhF26+3dz/fBsfumJjr9TTi8J3b1XneVSd2cSpSae+3JPBrMaZjGs9ZhXCuRYtFxLjSWaT34srIzpauRYWnw+8mK//8T5fpa/S9GTWCA01VdYvfxL9EjCu4VW2S4DNrCqBzbLIHOBg27Mfvi6DUeNP68E4v16w/yyMdGWj0/qUM+9CJFydBRcSs+pADJvNWMofPxToPg= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: A later patch keeps a PMD-mapped anonymous THP mapped by a PMD across the swap round-trip, so PG_anon_exclusive now has to survive in a swap PMD and not just in a swap PTE. x86-64 encodes a swap PMD exactly like a swap PTE, so the new helpers reuse _PAGE_SWP_EXCLUSIVE, bit 3, which the swap-entry layout already reserves for PG_anon_exclusive. 32-bit x86 aliases that bit to _PAGE_PSE and does not select ARCH_HAS_PMD_SOFTLEAVES. Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: x86@kernel.org Signed-off-by: Usama Arif --- arch/x86/include/asm/pgtable.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h index d551120a7c889..a2d1cd03cba23 100644 --- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h @@ -1525,6 +1525,23 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte) return pte_clear_flags(pte, _PAGE_SWP_EXCLUSIVE); } +#ifdef CONFIG_ARCH_HAS_PMD_SOFTLEAVES +static inline pmd_t pmd_swp_mkexclusive(pmd_t pmd) +{ + return pmd_set_flags(pmd, _PAGE_SWP_EXCLUSIVE); +} + +static inline bool pmd_swp_exclusive(pmd_t pmd) +{ + return pmd_flags(pmd) & _PAGE_SWP_EXCLUSIVE; +} + +static inline pmd_t pmd_swp_clear_exclusive(pmd_t pmd) +{ + return pmd_clear_flags(pmd, _PAGE_SWP_EXCLUSIVE); +} +#endif + #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY static inline pte_t pte_swp_mksoft_dirty(pte_t pte) { -- 2.53.0-Meta