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From: Steve Capper <steve.capper@arm.com>
To: linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org
Cc: catalin.marinas@arm.com, will.deacon@arm.com,
	ard.biesheuvel@linaro.org, jcm@redhat.com,
	Steve Capper <steve.capper@arm.com>
Subject: [PATCH V3 3/5] arm64: mm: Define arch_get_mmap_end, arch_get_mmap_base
Date: Wed, 14 Nov 2018 13:39:18 +0000	[thread overview]
Message-ID: <20181114133920.7134-4-steve.capper@arm.com> (raw)
In-Reply-To: <20181114133920.7134-1-steve.capper@arm.com>

Now that we have DEFAULT_MAP_WINDOW defined, we can arch_get_mmap_end
and arch_get_mmap_base helpers to allow for high addresses in mmap.

Signed-off-by: Steve Capper <steve.capper@arm.com>
---
 arch/arm64/include/asm/processor.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/include/asm/processor.h b/arch/arm64/include/asm/processor.h
index da41a2655b69..bbe602cb8fd3 100644
--- a/arch/arm64/include/asm/processor.h
+++ b/arch/arm64/include/asm/processor.h
@@ -72,6 +72,13 @@
 #define STACK_TOP		STACK_TOP_MAX
 #endif /* CONFIG_COMPAT */
 
+#define arch_get_mmap_end(addr) ((addr > DEFAULT_MAP_WINDOW) ? TASK_SIZE :\
+				DEFAULT_MAP_WINDOW)
+
+#define arch_get_mmap_base(addr, base) ((addr > DEFAULT_MAP_WINDOW) ? \
+					base + TASK_SIZE - DEFAULT_MAP_WINDOW :\
+					base)
+
 extern phys_addr_t arm64_dma_phys_limit;
 #define ARCH_LOW_ADDRESS_LIMIT	(arm64_dma_phys_limit - 1)
 
-- 
2.11.0

  parent reply	other threads:[~2018-11-14 13:39 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-14 13:39 [PATCH V3 0/5] 52-bit userspace VAs Steve Capper
2018-11-14 13:39 ` [PATCH V3 1/5] mm: mmap: Allow for "high" userspace addresses Steve Capper
2018-11-23 18:17   ` Catalin Marinas
2018-11-26 12:11     ` Steve Capper
2018-11-14 13:39 ` [PATCH V3 2/5] arm64: mm: Introduce DEFAULT_MAP_WINDOW Steve Capper
2018-11-27 17:09   ` Catalin Marinas
2018-11-27 17:15     ` Ard Biesheuvel
2018-11-28 16:31     ` Steve Capper
2018-11-14 13:39 ` Steve Capper [this message]
2018-11-27 17:10   ` [PATCH V3 3/5] arm64: mm: Define arch_get_mmap_end, arch_get_mmap_base Catalin Marinas
2018-11-28 16:31     ` Steve Capper
2018-11-14 13:39 ` [PATCH V3 4/5] arm64: mm: introduce 52-bit userspace support Steve Capper
2018-11-23 18:35   ` Catalin Marinas
2018-11-26 12:13     ` Steve Capper
2018-11-30 17:59   ` Catalin Marinas
2018-12-04 17:41     ` Steve Capper
2018-11-14 13:39 ` [PATCH V3 5/5] arm64: mm: Allow forcing all userspace addresses to 52-bit Steve Capper
2018-11-23 18:22   ` Catalin Marinas
2018-11-26 12:11     ` Steve Capper

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