riscv: Cleanup setup_bootmem()

After the following patches,

  commit de043da0b9e7 ("RISC-V: Fix usage of memblock_enforce_memory_limit")
  commit 1bd14a66ee52 ("RISC-V: Remove any memblock representing unusable memory area")
  commit b10d6bca8720 ("arch, drivers: replace for_each_membock() with for_each_mem_range()")

some logic is useless, kill the mem_start/start/end and unneeded code.

Reviewed-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>

diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index 9dfb8b2..067583a 100644 (file)
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -108,34 +108,17 @@ void __init mem_init(void)
 
 void __init setup_bootmem(void)
 {
-       phys_addr_t mem_start = 0;
-       phys_addr_t start, dram_end, end = 0;
        phys_addr_t vmlinux_end = __pa_symbol(&_end);
        phys_addr_t vmlinux_start = __pa_symbol(&_start);
+       phys_addr_t dram_end = memblock_end_of_DRAM();
        phys_addr_t max_mapped_addr = __pa(~(ulong)0);
-       u64 i;
-
-       /* Find the memory region containing the kernel */
-       for_each_mem_range(i, &start, &end) {
-               phys_addr_t size = end - start;
-               if (!mem_start)
-                       mem_start = start;
-               if (start <= vmlinux_start && vmlinux_end <= end)
-                       BUG_ON(size == 0);
-       }
 
-       /*
-        * The maximal physical memory size is -PAGE_OFFSET.
-        * Make sure that any memory beyond mem_start + (-PAGE_OFFSET) is removed
-        * as it is unusable by kernel.
-        */
+       /* The maximal physical memory size is -PAGE_OFFSET. */
        memblock_enforce_memory_limit(-PAGE_OFFSET);
 
        /* Reserve from the start of the kernel to the end of the kernel */
        memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
 
-       dram_end = memblock_end_of_DRAM();
-
        /*
         * memblock allocator is not aware of the fact that last 4K bytes of
         * the addressable memory can not be mapped because of IS_ERR_VALUE