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Sun, 1 Dec 2019 01:51:58 +0000 (UTC) Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 02266206E1; Sun, 1 Dec 2019 01:51:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1575165117; bh=oeL9/OLucOo0B18VzNVkAnYOw9gXgpKLMsHtWDpyPRs=; h=Date:From:To:Subject:From; b=tFmAadweW4Nq/KqU0Q/xYVLZZc+lHCYloxFszVPSJJYQvOn2OFbm+sl2MDSJ7fngX ZOeaVa12PkQcrfrahhFcWXBuVs/Hv5tZLnnIguqOl6zvKHOZjXy8nbMORZx4YnGFXD S75ff0Gnn9VMx52oqFM/PWhm6VML24bFn5Q9D4sM= Date: Sat, 30 Nov 2019 17:51:55 -0800 From: akpm@linux-foundation.org To: akpm@linux-foundation.org, alex@ghiti.fr, aou@eecs.berkeley.edu, ard.biesheuvel@linaro.org, arnd@arndb.de, aryabinin@virtuozzo.com, benh@kernel.crashing.org, borntraeger@de.ibm.com, bp@alien8.de, catalin.marinas@arm.com, dave.hansen@linux.intel.com, dave.jiang@intel.com, davem@davemloft.net, dvyukov@google.com, glider@google.com, gor@linux.ibm.com, heiko.carstens@de.ibm.com, hpa@zytor.com, james.morse@arm.com, jhogan@kernel.org, kan.liang@linux.intel.com, linux-mm@kvack.org, linux@armlinux.org.uk, luto@kernel.org, mark.rutland@arm.com, mawilcox@microsoft.com, mingo@elte.hu, mm-commits@vger.kernel.org, mpe@ellerman.id.au, n-horiguchi@ah.jp.nec.com, palmer@sifive.com, paul.burton@mips.com, paul.walmsley@sifive.com, paulus@samba.org, peterz@infradead.org, ralf@linux-mips.org, shashim@codeaurora.org, steven.price@arm.com, tglx@linutronix.de, torvalds@linux-foundation.org, vgupta@synopsys.com, will@kernel.org, zong.li@sifive.com Subject: [patch 050/158] mips: mm: add p?d_leaf() definitions Message-ID: <20191201015155.Ks4HHk5Gg%akpm@linux-foundation.org> User-Agent: s-nail v14.8.16 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: From: Steven Price Subject: mips: mm: add p?d_leaf() definitions 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 is provided by the p?d_leaf() functions/macros. If _PAGE_HUGE is defined we can simply look for it. When not defined we can be confident that there are no leaf pages in existence and fall back on the generic implementation (added in a later patch) which returns 0. Link: http://lkml.kernel.org/r/20191028135910.33253-6-steven.price@arm.com Signed-off-by: Steven Price Acked-by: Paul Burton Cc: Ralf Baechle Cc: Paul Burton Cc: James Hogan Cc: Albert Ou Cc: Alexander Potapenko Cc: Alexandre Ghiti Cc: Andrey Ryabinin Cc: Andy Lutomirski Cc: Ard Biesheuvel Cc: Arnd Bergmann Cc: Benjamin Herrenschmidt Cc: Borislav Petkov Cc: Catalin Marinas Cc: Christian Borntraeger Cc: Dave Hansen Cc: Dave Jiang Cc: David S. Miller Cc: Dmitry Vyukov Cc: Heiko Carstens Cc: "H. Peter Anvin" Cc: Ingo Molnar Cc: James Morse Cc: "Liang, Kan" Cc: Mark Rutland Cc: Matthew Wilcox Cc: Michael Ellerman Cc: Naoya Horiguchi Cc: Palmer Dabbelt Cc: Paul Mackerras Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Russell King Cc: Shiraz Hashim Cc: Thomas Gleixner Cc: Vasily Gorbik Cc: Vineet Gupta Cc: Will Deacon Cc: Zong Li Signed-off-by: Andrew Morton --- arch/mips/include/asm/pgtable.h | 5 +++++ 1 file changed, 5 insertions(+) --- a/arch/mips/include/asm/pgtable.h~mips-mm-add-pd_leaf-definitions +++ a/arch/mips/include/asm/pgtable.h @@ -639,6 +639,11 @@ static inline pmd_t pmdp_huge_get_and_cl #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ +#ifdef _PAGE_HUGE +#define pmd_leaf(pmd) ((pmd_val(pmd) & _PAGE_HUGE) != 0) +#define pud_leaf(pud) ((pud_val(pud) & _PAGE_HUGE) != 0) +#endif + #define gup_fast_permitted(start, end) (!cpu_has_dc_aliases) #include