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riscv: Cleanup setup_bootmem()

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After the following patches,

  commit de043da0b9 ("RISC-V: Fix usage of memblock_enforce_memory_limit")
  commit 1bd14a66ee ("RISC-V: Remove any memblock representing unusable memory area")
  commit b10d6bca87 ("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>
This commit is contained in:
Kefeng Wang 2021-02-09 09:01:51 +08:00 committed by Palmer Dabbelt
parent b122c7a325
commit dd2d082b57
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1 changed files with 2 additions and 19 deletions
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21
arch/riscv/mm/init.c
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@ -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