Messages in this thread | | | From | Max Filippov <> | Subject | [PATCH 0/3] xtensa: allow handling protection faults in noMMU | Date | Wed, 13 Apr 2022 16:49:27 -0700 |
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Hello,
most xtensa cores have some sort of memory protection mechanism, even those without full MMU. This series separates protection fault handling from the CONFIG_MMU setting and allows noMMU configurations to also do it. This improves userspace behavior in case of errors such as passing NULL pointer to a syscall that expects a valid memory pointer: instead of killing the process the kernel is now able to return -EINVAL from a syscall.
Max Filippov (3): xtensa: move asid_cache from fault.c to mmu.c xtensa: extract vmalloc_fault code into a function xtensa: noMMU: allow handling protection faults
arch/xtensa/Kconfig | 11 ++++ arch/xtensa/kernel/traps.c | 20 +++---- arch/xtensa/mm/Makefile | 3 +- arch/xtensa/mm/fault.c | 112 +++++++++++++++++++------------------ arch/xtensa/mm/mmu.c | 2 + 5 files changed, 83 insertions(+), 65 deletions(-)
-- 2.30.2
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