Unverified Commit c99127c4 authored by Alexandre Ghiti's avatar Alexandre Ghiti Committed by Palmer Dabbelt
Browse files

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



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: default avatarAlexandre Ghiti <alex@ghiti.fr>
Fixes: c9811e37 ("riscv: Add mem kernel parameter support")
Signed-off-by: default avatarPalmer Dabbelt <palmerdabbelt@google.com>
parent c09dc9e1

arch/riscv/mm/init.c

+2 −0
Original line number Diff line number Diff line
@@ -717,6 +717,8 @@ static void __init setup_vm_final(void) 
		if (start <= __pa(PAGE_OFFSET) &&

		    __pa(PAGE_OFFSET) < end)

			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);

		for (pa = start; pa < end; pa += map_size) {