From: Pekka Enberg <penberg@kernel.org>
Date: Sat, 5 Sep 2020 06:07:26 +0000 (+0300)
Subject: riscv/mm/fault: Set FAULT_FLAG_INSTRUCTION flag in do_page_fault()
X-Git-Tag: v5.10.7~1318^2~18
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a960c1323749383e62b67f5d49cdfbdcccde0ef6;p=platform%2Fkernel%2Flinux-rpi.git

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

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>
---

diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c
index a173432..1359e21 100644
--- a/arch/riscv/mm/fault.c
+++ b/arch/riscv/mm/fault.c
@@ -234,7 +234,8 @@ asmlinkage void do_page_fault(struct pt_regs *regs)
 
 	if (cause == EXC_STORE_PAGE_FAULT)
 		flags |= FAULT_FLAG_WRITE;
-
+	else if (cause == EXC_INST_PAGE_FAULT)
+		flags |= FAULT_FLAG_INSTRUCTION;
 retry:
 	mmap_read_lock(mm);
 	vma = find_vma(mm, addr);