From: Steve Capper <steve.capper@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: crecklin@redhat.com, ard.biesheuvel@linaro.org,
marc.zyngier@arm.com, catalin.marinas@arm.com,
bhsharma@redhat.com, will.deacon@arm.com
Subject: [PATCH v3 09/10] arm64: mm: Tweak PAGE_OFFSET logic
Date: Wed, 12 Jun 2019 18:26:57 +0100 [thread overview]
Message-ID: <20190612172658.28522-10-steve.capper@arm.com> (raw)
In-Reply-To: <20190612172658.28522-1-steve.capper@arm.com>
This patch introduces _PAGE_OFFSET(va) to allow for computing the
largest possible direct linear map for use with 48/52-bit selectable
kernel VAs.
Signed-off-by: Steve Capper <steve.capper@arm.com>
---
arch/arm64/include/asm/memory.h | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index d0fe2fa9169d..d3932463822c 100644
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -55,8 +55,9 @@
* VA_START - the first kernel virtual address.
*/
#define VA_BITS (CONFIG_ARM64_VA_BITS)
-#define PAGE_OFFSET (UL(0xffffffffffffffff) - \
- (UL(1) << VA_BITS) + 1)
+#define _PAGE_OFFSET(va) (UL(0xffffffffffffffff) - \
+ (UL(1) << (va)) + 1)
+#define PAGE_OFFSET (_PAGE_OFFSET(VA_BITS))
#define KIMAGE_VADDR (MODULES_END)
#define BPF_JIT_REGION_START (KASAN_SHADOW_END)
#define BPF_JIT_REGION_SIZE (SZ_128M)
--
2.20.1
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next prev parent reply other threads:[~2019-06-12 17:30 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-12 17:26 [PATCH v3 00/10] 52-bit kernel + user VAs Steve Capper
2019-06-12 17:26 ` [PATCH v3 01/10] arm64: mm: Flip kernel VA space Steve Capper
2019-06-14 12:17 ` Anshuman Khandual
2019-06-17 16:09 ` Steve Capper
2019-06-26 10:56 ` Catalin Marinas
2019-06-14 13:00 ` Anshuman Khandual
2019-06-17 16:08 ` Steve Capper
2019-06-12 17:26 ` [PATCH v3 02/10] arm64: kasan: Switch to using KASAN_SHADOW_OFFSET Steve Capper
2019-06-12 17:26 ` [PATCH v3 03/10] arm64: dump: De-constify VA_START and KASAN_SHADOW_START Steve Capper
2019-06-12 17:26 ` [PATCH v3 04/10] arm64: mm: Introduce VA_BITS_MIN Steve Capper
2019-06-12 17:26 ` [PATCH v3 05/10] arm64: mm: Introduce VA_BITS_ACTUAL Steve Capper
2019-06-12 17:26 ` [PATCH v3 06/10] arm64: mm: Logic to make offset_ttbr1 conditional Steve Capper
2019-06-12 17:26 ` [PATCH v3 07/10] arm64: mm: Separate out vmemmap Steve Capper
2019-06-12 17:26 ` [PATCH v3 08/10] arm64: mm: Modify calculation of VMEMMAP_SIZE Steve Capper
2019-06-12 17:26 ` Steve Capper [this message]
2019-06-12 17:26 ` [PATCH v3 10/10] arm64: mm: Introduce 52-bit Kernel VAs Steve Capper
2019-06-26 11:08 ` [PATCH v3 00/10] 52-bit kernel + user VAs Catalin Marinas
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