From fc2933c133744305236793025b00c2f7d258b687 Mon Sep 17 00:00:00 2001
From: Ard Biesheuvel <ardb@kernel.org>
Date: Wed, 28 Oct 2020 14:20:55 +0100
Subject: [PATCH] ARM: 9020/1: mm: use correct section size macro to describe
the FDT virtual address
Commit
149a3ffe62b9dbc3 ("9012/1: move device tree mapping out of linear region")
created a permanent, read-only section mapping of the device tree blob
provided by the firmware, and added a set of macros to get the base and
size of the virtually mapped FDT based on the physical address. However,
while the mapping code uses the SECTION_SIZE macro correctly, the macros
use PMD_SIZE instead, which means something entirely different on ARM when
using short descriptors, and is therefore not the right quantity to use
here. So replace PMD_SIZE with SECTION_SIZE. While at it, change the names
of the macro and its parameter to clarify that it returns the virtual
address of the start of the FDT, based on the physical address in memory.
Tested-by: Joel Stanley <joel@jms.id.au>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
arch/arm/include/asm/memory.h | 6 +++---
arch/arm/kernel/setup.c | 2 +-
2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
index 598dbdca2017..38a163f50130 100644
--- a/arch/arm/include/asm/memory.h
+++ b/arch/arm/include/asm/memory.h
@@ -73,8 +73,8 @@
#define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff))
#define FDT_FIXED_BASE UL(0xff800000)
-#define FDT_FIXED_SIZE (2 * PMD_SIZE)
-#define FDT_VIRT_ADDR(physaddr) ((void *)(FDT_FIXED_BASE | (physaddr) % PMD_SIZE))
+#define FDT_FIXED_SIZE (2 * SECTION_SIZE)
+#define FDT_VIRT_BASE(physbase) ((void *)(FDT_FIXED_BASE | (physbase) % SECTION_SIZE))
#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
/*
@@ -116,7 +116,7 @@ extern unsigned long vectors_base;
#define MODULES_VADDR PAGE_OFFSET
#define XIP_VIRT_ADDR(physaddr) (physaddr)
-#define FDT_VIRT_ADDR(physaddr) ((void *)(physaddr))
+#define FDT_VIRT_BASE(physbase) ((void *)(physbase))
#endif /* !CONFIG_MMU */
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index f4bd8b654255..d32f7652a5bf 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -1087,7 +1087,7 @@ void __init setup_arch(char **cmdline_p)
void *atags_vaddr = NULL;
if (__atags_pointer)
- atags_vaddr = FDT_VIRT_ADDR(__atags_pointer);
+ atags_vaddr = FDT_VIRT_BASE(__atags_pointer);
setup_processor();
if (atags_vaddr) {