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[209.85.220.65]) by mx.google.com with SMTPS id g95sor9159079plb.67.2019.06.23.02.45.36 for (Google Transport Security); Sun, 23 Jun 2019 02:45:37 -0700 (PDT) Received-SPF: pass (google.com: domain of npiggin@gmail.com designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b="nZ1uAEh/"; spf=pass (google.com: domain of npiggin@gmail.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=npiggin@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=wnbjux+HxNYOkFaRKhTh2OlBlr6Yjq4h8O9uCggPaW0=; b=nZ1uAEh/l/iH3XHgJ4JMzpVgG2BAjVP+Z4uP0nLctfLAj7AD/MmtA4UP0ovGBefyCX oi/eiKdn5rkb+cERs9Q8dHLJnb+ghuSMilmtfbCoNwrAS8IHMPARnfgHf8n9HMnua6zS +dxXBrDAzpJmAl2a5WPEl0+v9WftLVMpwR+Ki8qD5BEfrZHM6Z+MwQFgDagG17N4lc1g 5g3hUt3k1Vuvyww7G6od0qdoZYGYGxV4ZJ+E/1RRGg0hnv1OCHh2088YsdWh7C6PTe+t pG1oasPj0r+b4PVWCRQ/vj3KXGeUaEOXaQbg+/rH4Dd4SeFUb1BicT4qR09j10i/WFg9 yGJg== X-Google-Smtp-Source: APXvYqy03K0Z/MbKC+X3ScMS1p5nrg83Wdw/gotWUEhNW5qLKL0hUnw5AV3nEp2FnFcsXPqkd+XVzA== X-Received: by 2002:a17:902:7c03:: with SMTP id x3mr117368602pll.242.1561283136704; Sun, 23 Jun 2019 02:45:36 -0700 (PDT) Received: from bobo.ozlabs.ibm.com ([1.129.156.141]) by smtp.gmail.com with ESMTPSA id d26sm6181062pfn.29.2019.06.23.02.45.29 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Sun, 23 Jun 2019 02:45:36 -0700 (PDT) From: Nicholas Piggin To: linux-mm@kvack.org Cc: Nicholas Piggin , linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, Andrew Morton , Anshuman Khandual , Christophe Leroy , Ard Biesheuvel , Mark Rutland , Catalin Marinas , Will Deacon , Steven Price Subject: [PATCH 1/3] arm64: mm: Add p?d_large() definitions Date: Sun, 23 Jun 2019 19:44:44 +1000 Message-Id: <20190623094446.28722-2-npiggin@gmail.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190623094446.28722-1-npiggin@gmail.com> References: <20190623094446.28722-1-npiggin@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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: walk_page_range() is going to be allowed to walk page tables other than those of user space. For this it needs to know when it has reached a 'leaf' entry in the page tables. This information will be provided by the p?d_large() functions/macros. For arm64, we already have p?d_sect() macros which we can reuse for p?d_large(). pud_sect() is defined as a dummy function when CONFIG_PGTABLE_LEVELS < 3 or CONFIG_ARM64_64K_PAGES is defined. However when the kernel is configured this way then architecturally it isn't allowed to have a large page that this level, and any code using these page walking macros is implicitly relying on the page size/number of levels being the same as the kernel. So it is safe to reuse this for p?d_large() as it is an architectural restriction. Cc: Catalin Marinas Cc: Will Deacon Signed-off-by: Steven Price --- This patch is taken from arm64 but is required if this series is not build together with arm64 tree. arch/arm64/include/asm/pgtable.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index fca26759081a..0e973201bc16 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -417,6 +417,7 @@ extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, PMD_TYPE_TABLE) #define pmd_sect(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \ PMD_TYPE_SECT) +#define pmd_large(pmd) pmd_sect(pmd) #if defined(CONFIG_ARM64_64K_PAGES) || CONFIG_PGTABLE_LEVELS < 3 #define pud_sect(pud) (0) @@ -499,6 +500,7 @@ static inline void pte_unmap(pte_t *pte) { } #define pud_none(pud) (!pud_val(pud)) #define pud_bad(pud) (!(pud_val(pud) & PUD_TABLE_BIT)) #define pud_present(pud) pte_present(pud_pte(pud)) +#define pud_large(pud) pud_sect(pud) #define pud_valid(pud) pte_valid(pud_pte(pud)) static inline void set_pud(pud_t *pudp, pud_t pud) -- 2.20.1