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riscv: Support allocating gigantic hugepages using CMA

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This patch adds support to allocate gigantic hugepages using CMA by
specifying the hugetlb_cma= kernel parameter.  This is only supported on
RV64.

Reviewed-by: Alexandre Ghiti <alex@ghiti.fr>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Kefeng Wang 2021-07-30 20:48:41 +08:00 committed by Palmer Dabbelt
parent fb31f0a499
commit 8ba1a8b77b
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1 changed files with 3 additions and 0 deletions
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3
arch/riscv/mm/init.c
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@ -19,6 +19,7 @@
#include <linux/set_memory.h>
#include <linux/dma-map-ops.h>
#include <linux/crash_dump.h>
#include <linux/hugetlb.h>
#include <asm/fixmap.h>
#include <asm/tlbflush.h>
@ -202,6 +203,8 @@ static void __init setup_bootmem(void)
early_init_fdt_scan_reserved_mem();
dma_contiguous_reserve(dma32_phys_limit);
if (IS_ENABLED(CONFIG_64BIT))
hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
memblock_allow_resize();
}