The part of physical memory that exceeds the size of the linear mapping
will be discarded. When the system starts up normally, a warning message
will be printed to prevent confusion caused by the mismatch between the
system memory and the actual physical memory.
Signed-off-by: Yunhui Cui <cuiyunhui@bytedance.com>
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Tested-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Link: https://lore.kernel.org/r/20240814062625.19794-1-cuiyunhui@bytedance.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
*/
if (IS_ENABLED(CONFIG_64BIT) && IS_ENABLED(CONFIG_MMU)) {
max_mapped_addr = __pa(PAGE_OFFSET) + KERN_VIRT_SIZE;
- memblock_cap_memory_range(phys_ram_base,
- max_mapped_addr - phys_ram_base);
+ if (memblock_end_of_DRAM() > max_mapped_addr) {
+ memblock_cap_memory_range(phys_ram_base,
+ max_mapped_addr - phys_ram_base);
+ pr_warn("Physical memory overflows the linear mapping size: region above %pa removed",
+ &max_mapped_addr);
+ }
}
/*