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riscv/mm/fault: Set FAULT_FLAG_INSTRUCTION flag in do_page_fault()

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If the page fault "cause" is EXC_INST_PAGE_FAULT, set the
FAULT_FLAG_INSTRUCTION flag to let handle_mm_fault() and friends know
about it. This has no functional changes because RISC-V uses the default
arch_vma_access_permitted() implementation, which always returns true.
However, dax_pmd_fault(), for example, has a tracepoint that uses
FAULT_FLAG_INSTRUCTION, so we might as well set it.

Signed-off-by: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Pekka Enberg
2020-09-05 09:07:26 +03:00
committed by Palmer Dabbelt
parent 2baa6d9506
commit a960c13237
1 changed files with 2 additions and 1 deletions
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3
arch/riscv/mm/fault.c
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@@ -234,7 +234,8 @@ asmlinkage void do_page_fault(struct pt_regs *regs)
if (cause == EXC_STORE_PAGE_FAULT) if (cause == EXC_STORE_PAGE_FAULT)
flags |= FAULT_FLAG_WRITE; flags |= FAULT_FLAG_WRITE;
else if (cause == EXC_INST_PAGE_FAULT)
flags |= FAULT_FLAG_INSTRUCTION;
retry: retry:
mmap_read_lock(mm); mmap_read_lock(mm);
vma = find_vma(mm, addr); vma = find_vma(mm, addr);