leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

RISC-V: Fix Maximum Physical Memory 2GiB option for 64bit systems

Browse Source 
The Maximum Physical Memory 2GiB option for 64bit systems is currently
broken because kernel hangs at boot-time when this option is enabled
and the underlying system has more than 2GiB memory.

This issue can be easily reproduced on SiFive Unleashed board where
we have 8GiB of memory.

This patch fixes above issue by removing unusable memory region in
setup_bootmem().

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
This commit is contained in:
Anup Patel 2019-04-05 05:49:34 +00:00 committed by Palmer Dabbelt
parent 6ec4bae178
commit f05badde4e
No known key found for this signature in database
GPG Key ID: EF4CA1502CCBAB41
1 changed files with 8 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
arch/riscv/mm/init.c
View File

@ -121,6 +121,14 @@ void __init setup_bootmem(void)
*/
memblock_reserve(reg->base, vmlinux_end - reg->base);
mem_size = min(reg->size, (phys_addr_t)-PAGE_OFFSET);
/*
* Remove memblock from the end of usable area to the
* end of region
*/
if (reg->base + mem_size < end)
memblock_remove(reg->base + mem_size,
end - reg->base - mem_size);
}
}
BUG_ON(mem_size == 0);