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Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1pPTyF-000Vsr-UL; Tue, 07 Feb 2023 19:49:40 +0000 From: "Matthew Wilcox (Oracle)" To: Yin Fengwei , linux-mm@kvack.org Cc: "Matthew Wilcox (Oracle)" , david@redhat.com, dave.hansen@intel.com, tim.c.chen@intel.com, ying.huang@intel.com Subject: [PATCH v5 2/5] mm: Add generic set_ptes() Date: Tue, 7 Feb 2023 19:49:32 +0000 Message-Id: <20230207194937.122543-3-willy@infradead.org> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20230207194937.122543-1-willy@infradead.org> References: <20230207194937.122543-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 6391EA0006 X-Rspamd-Server: rspam09 X-Rspam-User: X-Stat-Signature: adaeynsih4phswrew94484d9w1sf393e X-HE-Tag: 1675799384-249297 X-HE-Meta: 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 QMAVB7Qr sZCTqxWtHkBu7S/cIIpK42cub5sJSoKI5jjoVWO0zDbtzQyqqXQ53qi+hU00zCEHfljgrd/kjBfDhwk4nOYcjySbpiWSNnqKAwzJ9DuJmm1Vx2oebiGR1id3x9REqJNseDqSvOkDHV+QKGVJZzcrwOIGuJDsA2AlPOa72Fhx/Y8SxT8W6DzVbOYVBlOyJMZf5vTxruowmyVkJhzgR/bgER7V0wNovsCpp8ww/aqRVK1QmQH3Y73GiY+dcFw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: This set_ptes should work for most architectures. Those that need to set a special bit in their PTEs or have their PFNs located at a different offset from PAGE_SHIFT will need to override it. Signed-off-by: Matthew Wilcox (Oracle) --- include/linux/pgtable.h | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index c63cd44777ec..e1804d23e7c4 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -1439,6 +1439,33 @@ static inline int pmd_protnone(pmd_t pmd) #endif /* CONFIG_MMU */ +#ifndef set_ptes +/** + * set_ptes - Map consecutive pages to a contiguous range of addresses. + * @mm: Address space to map the pages into. + * @addr: Address to map the first page at. + * @ptep: Page table pointer for the first entry. + * @pte: Page table entry for the first page. + * @nr: Number of pages to map. + * + * Context: The caller holds the page table lock. The PTEs all lie + * within a single PMD (and VMA, and folio). + */ +static inline void set_ptes(struct mm_struct *mm, unsigned long addr, + pte_t *ptep, pte_t pte, unsigned int nr) +{ + for (;;) { + set_pte_at(mm, addr, ptep, pte); + if (--nr == 0) + break; + ptep++; + addr += PAGE_SIZE; + /* This works for x86. Check how PTEs are encoded */ + pte = __pte(pte_val(pte) + PAGE_SIZE); + } +} +#endif + #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP #ifndef __PAGETABLE_P4D_FOLDED -- 2.35.1