When building with an allnoconfig-derived minimal configuration
(without CONFIG_STRICT_MODULE_RWX), kprobes fails because
instruction slot pages from EXECMEM_KPROBES are read-only and
patch_map() bypasses the fixmap writable alias.

These two patches fix the infrastructure.

v2:
  - use CONFIG_STRICT_MODULE_RWX instead of CONFIG_ARCH_HAS_EXECMEM_ROX
    in PATCH 1/2
  - add commit description to PATCH 2/2
v3:
  - simplify PATCH 2/2: early return when !CONFIG_STRICT_MODULE_RWX
    (suggested by Nam Cao)

Xiaofeng Yuan (2):
  riscv: mm: make EXECMEM_KPROBES writable without
    CONFIG_STRICT_MODULE_RWX
  riscv: patch: skip fixmap mapping when kernel text is already
    writable

 arch/riscv/kernel/patch.c | 4 ++--
 arch/riscv/mm/init.c      | 4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)