6.5-stable review patch. If anyone has any objections, please let me know.
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From: Huacai Chen chenhuacai@loongson.cn
commit 1943feecf80e73ecc03ce40271f29c6cea142bac upstream.
For 64bit kernel without HIGHMEM, high_memory is the virtual address of the highest physical address in the system. But __va(get_num_physpages() << PAGE_SHIFT) is not what we want for high_memory because there may be holes in the physical address space. On the other hand, max_low_pfn is calculated from memblock_end_of_DRAM(), which is exactly corresponding to the highest physical address, so use it for high_memory calculation.
Cc: stable@vger.kernel.org Fixes: d4b6f1562a3c3284adce ("LoongArch: Add Non-Uniform Memory Access (NUMA) support") Signed-off-by: Chong Qiao qiaochong@loongson.cn Signed-off-by: Huacai Chen chenhuacai@loongson.cn Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/loongarch/kernel/numa.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/loongarch/kernel/numa.c +++ b/arch/loongarch/kernel/numa.c @@ -468,7 +468,7 @@ void __init paging_init(void)
void __init mem_init(void) { - high_memory = (void *) __va(get_num_physpages() << PAGE_SHIFT); + high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT); memblock_free_all(); setup_zero_pages(); /* This comes from node 0 */ }