Patch "arm64: Initialise high_memory global variable earlier" has been added to the 4.14-stable tree

Patch "arm64: Initialise high_memory global variable earlier" has been added to the 4.14-stable tree

[gregkh]

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

    arm64: Initialise high_memory global variable earlier

to the 4.14-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:
     arm64-initialise-high_memory-global-variable-earlier.patch
and it can be found in the queue-4.14 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 f24e5834a2c3f6c5f814a417f858226f0a010ade Mon Sep 17 00:00:00 2001
From: Steve Capper <steve.capper@arm.com>
Date: Mon, 4 Dec 2017 14:13:05 +0000
Subject: arm64: Initialise high_memory global variable earlier

From: Steve Capper <steve.capper@arm.com>

commit f24e5834a2c3f6c5f814a417f858226f0a010ade upstream.

The high_memory global variable is used by
cma_declare_contiguous(.) before it is defined.

We don't notice this as we compute __pa(high_memory - 1), and it looks
like we're processing a VA from the direct linear map.

This problem becomes apparent when we flip the kernel virtual address
space and the linear map is moved to the bottom of the kernel VA space.

This patch moves the initialisation of high_memory before it used.

Fixes: f7426b983a6a ("mm: cma: adjust address limit to avoid hitting low/high memory boundary")
Signed-off-by: Steve Capper <steve.capper@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/arm64/mm/init.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -476,6 +476,8 @@ void __init arm64_memblock_init(void)
 
 	reserve_elfcorehdr();
 
+	high_memory = __va(memblock_end_of_DRAM() - 1) + 1;
+
 	dma_contiguous_reserve(arm64_dma_phys_limit);
 
 	memblock_allow_resize();
@@ -502,7 +504,6 @@ void __init bootmem_init(void)
 	sparse_init();
 	zone_sizes_init(min, max);
 
-	high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
 	memblock_dump_all();
 }
 


Patches currently in stable-queue which might be from steve.capper@arm.com are

queue-4.14/arm64-initialise-high_memory-global-variable-earlier.patch
queue-4.14/arm64-mm-fix-pte_mkclean-pte_mkdirty-semantics.patch