diff options
| author | Anup Patel <anup.patel@wdc.com> | 2020-06-01 10:36:56 +0530 |
|---|---|---|
| committer | Palmer Dabbelt <palmerdabbelt@google.com> | 2020-06-09 19:11:26 -0700 |
| commit | 4e0f9e3a6104261f25b16fcab02fc96f5666ba11 (patch) | |
| tree | 96404fb2ee2b129c58e4e99261e756dc90e9bdcc | |
| parent | e71ee06e3ca337758ac95288a917622ff9808fa0 (diff) | |
RISC-V: Don't mark init section as non-executable
The head text section (i.e. _start, secondary_start_sbi, etc) and the
init section fall under same page table level-1 mapping.
Currently, the runtime CPU hotplug is broken because we are marking
init section as non-executable which in-turn marks head text section
as non-executable.
Further investigating other architectures, it seems marking the init
section as non-executable is redundant because the init section pages
are anyway poisoned and freed.
To fix broken runtime CPU hotplug, we simply remove the code marking
the init section as non-executable.
Fixes: d27c3c90817e ("riscv: add STRICT_KERNEL_RWX support")
Cc: stable@vger.kernel.org
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Zong Li <zong.li@sifive.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
| -rw-r--r-- | arch/riscv/mm/init.c | 11 |
1 files changed, 0 insertions, 11 deletions
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index 34327407b0c5..6b2fb2ca0302 100644 --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -481,17 +481,6 @@ static void __init setup_vm_final(void) csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | SATP_MODE); local_flush_tlb_all(); } - -void free_initmem(void) -{ - unsigned long init_begin = (unsigned long)__init_begin; - unsigned long init_end = (unsigned long)__init_end; - - /* Make the region as non-execuatble. */ - set_memory_nx(init_begin, (init_end - init_begin) >> PAGE_SHIFT); - free_initmem_default(POISON_FREE_INITMEM); -} - #else asmlinkage void __init setup_vm(uintptr_t dtb_pa) { |