From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f41.google.com (mail-wm0-f41.google.com [74.125.82.41]) by kanga.kvack.org (Postfix) with ESMTP id 1E1A96B025E for ; Wed, 30 Mar 2016 10:46:22 -0400 (EDT) Received: by mail-wm0-f41.google.com with SMTP id 191so92690663wmq.0 for ; Wed, 30 Mar 2016 07:46:22 -0700 (PDT) Received: from mail-wm0-x22d.google.com (mail-wm0-x22d.google.com. [2a00:1450:400c:c09::22d]) by mx.google.com with ESMTPS id ev16si5654217wjd.112.2016.03.30.07.46.21 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 30 Mar 2016 07:46:21 -0700 (PDT) Received: by mail-wm0-x22d.google.com with SMTP id p65so75388814wmp.0 for ; Wed, 30 Mar 2016 07:46:21 -0700 (PDT) From: Ard Biesheuvel Subject: [PATCH v2 3/9] arm64: mm: avoid virt_to_page() translation for the zero page Date: Wed, 30 Mar 2016 16:45:58 +0200 Message-Id: <1459349164-27175-4-git-send-email-ard.biesheuvel@linaro.org> In-Reply-To: <1459349164-27175-1-git-send-email-ard.biesheuvel@linaro.org> References: <1459349164-27175-1-git-send-email-ard.biesheuvel@linaro.org> Sender: owner-linux-mm@kvack.org List-ID: To: linux-arm-kernel@lists.infradead.org, catalin.marinas@arm.com, will.deacon@arm.com, linux-mm@kvack.org, akpm@linux-foundation.org, nios2-dev@lists.rocketboards.org, lftan@altera.com, jonas@southpole.se, linux@lists.openrisc.net Cc: mark.rutland@arm.com, steve.capper@linaro.org, Ard Biesheuvel The zero page is statically allocated, so grab its struct page pointer without using virt_to_page(), which will be restricted to the linear mapping later. Signed-off-by: Ard Biesheuvel --- arch/arm64/include/asm/pgtable.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index aa6106ac050c..377257a8d393 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -57,7 +57,7 @@ extern void __pgd_error(const char *file, int line, unsigned long val); * for zero-mapped memory areas etc.. */ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; -#define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page) +#define ZERO_PAGE(vaddr) pfn_to_page(PHYS_PFN(__pa(empty_zero_page))) #define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte_val(pte)) -- 2.5.0 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org