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riscv: Make sure the linear mapping does not use the kernel mapping

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For 64-bit kernel, the end of the address space is occupied by the
kernel mapping and currently, the functions to populate the kernel page
tables (i.e. create_p*d_mapping) do not override existing mapping so we
must make sure the linear mapping does not map memory in the kernel mapping
by clipping the memory above the memory limit.

Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
Fixes: c9811e379b ("riscv: Add mem kernel parameter support")
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Alexandre Ghiti 2021-06-29 11:13:47 +02:00 committed by Palmer Dabbelt
parent c09dc9e1cd
commit c99127c452
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arch/riscv/mm/init.c
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@ -717,6 +717,8 @@ static void __init setup_vm_final(void)
if (start <= __pa(PAGE_OFFSET) && if (start <= __pa(PAGE_OFFSET) &&
__pa(PAGE_OFFSET) < end) __pa(PAGE_OFFSET) < end)
start = __pa(PAGE_OFFSET); start = __pa(PAGE_OFFSET);
if (end >= __pa(PAGE_OFFSET) + memory_limit)
end = __pa(PAGE_OFFSET) + memory_limit;
map_size = best_map_size(start, end - start); map_size = best_map_size(start, end - start);
for (pa = start; pa < end; pa += map_size) { for (pa = start; pa < end; pa += map_size) {