diff options
| author | Anup Patel | 2019-06-07 06:01:29 +0000 |
|---|---|---|
| committer | Paul Walmsley | 2019-07-01 13:24:53 -0700 |
| commit | d90d45d7dcb732f0d4fbb3b99164ae54999612d5 (patch) | |
| tree | d27cd084d87a9d5ec813eb39b4c01e6bbb587de7 /arch/riscv | |
| parent | bbc5dc5155aad9ba50eeda955c591549d761c1db (diff) | |
RISC-V: Fix memory reservation in setup_bootmem()
Currently, the setup_bootmem() reserves memory from RAM start to the
kernel end. This prevents us from exploring ways to use the RAM below
(or before) the kernel start hence this patch updates setup_bootmem()
to only reserve memory from the kernel start to the kernel end.
Suggested-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
Diffstat (limited to 'arch/riscv')
| -rw-r--r-- | arch/riscv/mm/init.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index 84747d7a1e85..160d79d58dd5 100644 --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -21,6 +21,8 @@ unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss; EXPORT_SYMBOL(empty_zero_page); +extern char _start[]; + static void __init zone_sizes_init(void) { unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, }; @@ -95,18 +97,14 @@ void __init setup_bootmem(void) { struct memblock_region *reg; phys_addr_t mem_size = 0; + phys_addr_t vmlinux_end = __pa(&_end); + phys_addr_t vmlinux_start = __pa(&_start); /* Find the memory region containing the kernel */ for_each_memblock(memory, reg) { - phys_addr_t vmlinux_end = __pa(_end); phys_addr_t end = reg->base + reg->size; if (reg->base <= vmlinux_end && vmlinux_end <= end) { - /* - * Reserve from the start of the region to the end of - * the kernel - */ - memblock_reserve(reg->base, vmlinux_end - reg->base); mem_size = min(reg->size, (phys_addr_t)-PAGE_OFFSET); /* @@ -120,6 +118,9 @@ void __init setup_bootmem(void) } BUG_ON(mem_size == 0); + /* Reserve from the start of the kernel to the end of the kernel */ + memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start); + set_max_mapnr(PFN_DOWN(mem_size)); max_low_pfn = PFN_DOWN(memblock_end_of_DRAM()); @@ -197,7 +198,6 @@ void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot) asmlinkage void __init setup_vm(void) { - extern char _start; uintptr_t i; uintptr_t pa = (uintptr_t) &_start; pgprot_t prot = __pgprot(pgprot_val(PAGE_KERNEL) | _PAGE_EXEC); |