Unverified Commit 8ba1a8b7 authored by Kefeng Wang's avatar Kefeng Wang Committed by Palmer Dabbelt
Browse files

riscv: Support allocating gigantic hugepages using CMA 



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: default avatarAlexandre Ghiti <alex@ghiti.fr>
Signed-off-by: default avatarKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: default avatarPalmer Dabbelt <palmerdabbelt@google.com>
parent fb31f0a4

arch/riscv/mm/init.c

+3 −0
Original line number Diff line number Diff line
@@ -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();

}