From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
To: linux-arm-kernel@lists.infradead.org, catalin.marinas@arm.com,
will.deacon@arm.com, mark.rutland@arm.com
Cc: linux-mm@kvack.org, akpm@linux-foundation.org,
nios2-dev@lists.rocketboards.org, lftan@altera.com,
jonas@southpole.se, linux@lists.openrisc.net,
Ard Biesheuvel <ard.biesheuvel@linaro.org>
Subject: [PATCH v2 3/9] arm64: mm: avoid virt_to_page() translation for the zero page
Date: Mon, 29 Feb 2016 15:44:38 +0100 [thread overview]
Message-ID: <1456757084-1078-4-git-send-email-ard.biesheuvel@linaro.org> (raw)
In-Reply-To: <1456757084-1078-1-git-send-email-ard.biesheuvel@linaro.org>
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 <ard.biesheuvel@linaro.org>
---
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 7d0a9eab1133..af80e437d075 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(__pa(empty_zero_page) >> PAGE_SHIFT)
#define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte_val(pte))
--
2.5.0
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next prev parent reply other threads:[~2016-02-29 14:45 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-29 14:44 [PATCH v2 0/9] arm64: optimize virt_to_page and page_address Ard Biesheuvel
2016-02-29 14:44 ` [PATCH v2 1/9] arm64: vdso: avoid virt_to_page() translations on kernel symbols Ard Biesheuvel
2016-02-29 14:44 ` [PATCH v2 2/9] arm64: mm: free __init memory via the linear mapping Ard Biesheuvel
2016-02-29 14:44 ` Ard Biesheuvel [this message]
2016-02-29 14:44 ` [PATCH v2 4/9] arm64: insn: avoid virt_to_page() translations on core kernel symbols Ard Biesheuvel
2016-02-29 14:44 ` [PATCH v2 5/9] arm64: mm: move vmemmap region right below the linear region Ard Biesheuvel
2016-03-01 15:39 ` Catalin Marinas
2016-03-01 15:43 ` Ard Biesheuvel
2016-02-29 14:44 ` [PATCH v2 6/9] arm64: mm: restrict virt_to_page() to the linear mapping Ard Biesheuvel
2016-02-29 14:44 ` [PATCH v2 7/9] nios2: use correct void* return type for page_to_virt() Ard Biesheuvel
2016-02-29 14:44 ` [PATCH v2 8/9] openrisc: drop wrongly typed definition of page_to_virt() Ard Biesheuvel
2016-02-29 14:44 ` [PATCH v2 9/9] mm: replace open coded page to virt conversion with page_to_virt() Ard Biesheuvel
-- strict thread matches above, loose matches on Subject: below --
2016-03-30 14:45 [PATCH v2 0/9] arm64: optimize virt_to_page and page_address Ard Biesheuvel
2016-03-30 14:45 ` [PATCH v2 3/9] arm64: mm: avoid virt_to_page() translation for the zero page Ard Biesheuvel
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