Messages in this thread Patch in this message | | | From | <> | Subject | [PATCH] ARM: Handle non-pmd-aligned end of first memblock. | Date | Fri, 18 Mar 2016 17:49:27 +0800 |
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From: Yun Hsiang <yun.hsiang@mediatek.com>
In paging_init(), if the end address of first memblock is non-PMD-aligned,we need to create a next-level page table for mapping the non-PMD-sized area. The memory of this next-level page table will be allocated from address of memblock.limit with a top-down order. sanity_check_meminfo() will find the address of first non-pmd-aligned page in memblock.memory, round down the address, and set it to memblock.current_limit.
There is a risk if arm_memblock_init()execute before sanity_check_meminfo(). arm_memblock_init() parse the device tree and modified memblock if there are no-map node in device tree. It might produce a new non-PMD-aligned block. While creating mapping to this new non-PMD-aligned block, the page table will be allocated from the memblock.limit which is still unmapped.
Signed-off-by: Yun Hsiang <yun.hsiang@mediatek.com> --- arch/arm/kernel/setup.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c index 7d0cba6f..940e4bd 100644 --- a/arch/arm/kernel/setup.c +++ b/arch/arm/kernel/setup.c @@ -1036,11 +1036,11 @@ void __init setup_arch(char **cmdline_p) #endif setup_dma_zone(mdesc); efi_init(); - sanity_check_meminfo(); arm_memblock_init(mdesc); early_ioremap_reset(); + sanity_check_meminfo(); paging_init(mdesc); request_standard_resources(mdesc); -- 1.9.1
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