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| author |   Alexandre Ghiti <alex@ghiti.fr> | 2021-06-29 11:13:47 +0200 |
|---|---|---|
| committer |   Palmer Dabbelt <palmerdabbelt@google.com> | 2021-07-22 20:48:04 -0700 |
| commit | c99127c452484ac89c75af39c3c865174ce2de99 (patch) | |
| tree | d46bc59f44a7d801862c553f8364325a9da4224a /arch | |
| parent | riscv: Fix memory_limit for 64-bit kernel (diff) | |
| download | linux-dev-c99127c452484ac89c75af39c3c865174ce2de99.tar.xz linux-dev-c99127c452484ac89c75af39c3c865174ce2de99.zip | |
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: Alexandre Ghiti <alex@ghiti.fr>
Fixes: c9811e379b21 ("riscv: Add mem kernel parameter support")
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/riscv/mm/init.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index e4356d65fdce..644a34b0d77d 100644 --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -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) { |