4.4-stable review patch. If anyone has any objections, please let me know.
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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 | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -178,6 +178,7 @@ void __init arm64_memblock_init(void) arm64_dma_phys_limit = max_zone_dma_phys(); else arm64_dma_phys_limit = PHYS_MASK + 1; + high_memory = __va(memblock_end_of_DRAM() - 1) + 1; dma_contiguous_reserve(arm64_dma_phys_limit);
memblock_allow_resize(); @@ -202,7 +203,6 @@ void __init bootmem_init(void) sparse_init(); zone_sizes_init(min, max);
- high_memory = __va((max << PAGE_SHIFT) - 1) + 1; max_pfn = max_low_pfn = max; }