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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 , Huacai Chen Subject: [RESEND v7 03/29] loongarch: mm: add PMD swap-exclusive helpers Date: Mon, 14 Sep 2026 05:27:53 -0700 Message-ID: <20260914122950.3283997-4-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: rspam05 X-Rspamd-Queue-Id: B6C17100002 X-Stat-Signature: jcjumandba453d56f93uuzo1s81seayf X-Rspam-User: X-HE-Tag: 1789389049-241852 X-HE-Meta: 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 Tkc7RmHd UdC3UqeQNG2PDPe2yz6OuOUZ4XZtvqlrpJld4D/zzouITo5c8fiAVXxNvN9/krjL7pGrsOZ1IsGahvl8RsaaStouOqAtq3R5niLyNyjIXzOGP/IIEpDL4c4gk9JyAENKCARrS+3NCEBGEPJ1xOzA5cHvJc5MOMlJ2qfVRWYYido04qPmR1D2qmWmpYjZfh/pzc3XCa+QPWISYuiK8+w0NRPkE5LC0SKPIVC8BEYhAmoHkEeCQsjwjYGd6HM1ztGJRdtvSw4f8rS5XnTH9n4LoqpDkbg== 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. A LoongArch swap PMD is the swap PTE value plus _PAGE_HUGE, and _PAGE_SWP_EXCLUSIVE sits outside both the type and the offset field, so the PMD helpers can use the same bit. Cc: Huacai Chen Signed-off-by: Usama Arif --- arch/loongarch/include/asm/pgtable.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/arch/loongarch/include/asm/pgtable.h b/arch/loongarch/include/asm/pgtable.h index cf29a4c8ac593..87fecc3a51001 100644 --- a/arch/loongarch/include/asm/pgtable.h +++ b/arch/loongarch/include/asm/pgtable.h @@ -351,6 +351,25 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte) return pte; } +#ifdef CONFIG_ARCH_HAS_PMD_SOFTLEAVES +static inline pmd_t pmd_swp_mkexclusive(pmd_t pmd) +{ + pmd_val(pmd) |= _PAGE_SWP_EXCLUSIVE; + return pmd; +} + +static inline bool pmd_swp_exclusive(pmd_t pmd) +{ + return pmd_val(pmd) & _PAGE_SWP_EXCLUSIVE; +} + +static inline pmd_t pmd_swp_clear_exclusive(pmd_t pmd) +{ + pmd_val(pmd) &= ~_PAGE_SWP_EXCLUSIVE; + return pmd; +} +#endif + #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) #define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE)) #define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC) -- 2.53.0-Meta