Patch "ARM: 9020/1: mm: use correct section size macro to describe the FDT virtual address" has been added to the 5.10-stable tree

From: <gregkh@linuxfoundation.org>
To: akpm@linux-foundation.org, ardb@kernel.org, corbet@lwn.net,
	f.fainelli@gmail.com, gregkh@linuxfoundation.org,
	jcmvbkbc@gmail.com, joe@perches.com, joel@jms.id.au,
	linus.walleij@linaro.org, linux-arm-kernel@lists.infradead.org,
	linux@armlinux.org.uk, m.szyprowski@samsung.com,
	ndesaulniers@google.com, nico@fluxnic.net,
	rmk+kernel@armlinux.org.uk, rppt@kernel.org, sashal@kernel.org,
	tiantao6@hisilicon.com
Cc: <stable-commits@vger.kernel.org>
Subject: Patch "ARM: 9020/1: mm: use correct section size macro to describe the FDT virtual address" has been added to the 5.10-stable tree
Date: Mon, 17 May 2021 13:37:58 +0200	[thread overview]
Message-ID: <162125147881186@kroah.com> (raw)
In-Reply-To: <20210510132111.1690943-4-f.fainelli@gmail.com>


This is a note to let you know that I've just added the patch titled

    ARM: 9020/1: mm: use correct section size macro to describe the FDT virtual address

to the 5.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     arm-9020-1-mm-use-correct-section-size-macro-to-describe-the-fdt-virtual-address.patch
and it can be found in the queue-5.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


From foo@baz Mon May 17 01:35:13 PM CEST 2021
From: Florian Fainelli <f.fainelli@gmail.com>
Date: Mon, 10 May 2021 06:21:10 -0700
Subject: ARM: 9020/1: mm: use correct section size macro to describe the FDT virtual address
To: stable@vger.kernel.org
Cc: Ard Biesheuvel <ardb@kernel.org>, Joel Stanley <joel@jms.id.au>, Marek Szyprowski <m.szyprowski@samsung.com>, Russell King <rmk+kernel@armlinux.org.uk>, Florian Fainelli <f.fainelli@gmail.com>, Jonathan Corbet <corbet@lwn.net>, Russell King <linux@armlinux.org.uk>, Nicolas Pitre <nico@fluxnic.net>, Linus Walleij <linus.walleij@linaro.org>, Mike Rapoport <rppt@kernel.org>, Andrew Morton <akpm@linux-foundation.org>, Nick Desaulniers <ndesaulniers@google.com>, Joe Perches <joe@perches.com>, Max Filippov <jcmvbkbc@gmail.com>, Tian Tao <tiantao6@hisilicon.com>, linux-doc@vger.kernel.org (open list:DOCUMENTATION), linux-kernel@vger.kernel.org (open list), linux-arm-kernel@lists.infradead.org (moderated list:ARM PORT), Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Sasha Levin <sashal@kernel.org>
Message-ID: <20210510132111.1690943-4-f.fainelli@gmail.com>

From: Ard Biesheuvel <ardb@kernel.org>

commit fc2933c133744305236793025b00c2f7d258b687 upstream

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>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/arm/include/asm/memory.h |    6 +++---
 arch/arm/kernel/setup.c       |    2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

--- a/arch/arm/include/asm/memory.h
+++ b/arch/arm/include/asm/memory.h
@@ -68,8 +68,8 @@
 #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)
 /*
@@ -111,7 +111,7 @@ 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 */
 
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -1086,7 +1086,7 @@ 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) {


Patches currently in stable-queue which might be from f.fainelli@gmail.com are

queue-5.10/arm-9020-1-mm-use-correct-section-size-macro-to-describe-the-fdt-virtual-address.patch
queue-5.10/arm-9011-1-centralize-phys-to-virt-conversion-of-dt-atags-address.patch
queue-5.10/arm-9027-1-head.s-explicitly-map-dt-even-if-it-lives-in-the-first-physical-section.patch
queue-5.10/arm-9012-1-move-device-tree-mapping-out-of-linear-region.patch

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