riscv: add a warning when physical memory address overflows

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>

diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index 0e8c20adcd98df5874fecb70573f9375ca333407..9641e4ad387f46cfdad7e88c4358f2f8f46a0396 100644 (file)
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -256,8 +256,12 @@ static void __init setup_bootmem(void)
         */
        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);
+               }
        }
 
        /*

diff --git a/scripts/selinux/genheaders/genheaders b/scripts/selinux/genheaders/genheaders
new file mode 100755 (executable)
index 0000000..3fc32a6
Binary files /dev/null and b/scripts/selinux/genheaders/genheaders differ