From: Pekka Enberg <penberg@gmail.com>
To: linux-riscv@lists.infradead.org
Cc: Pekka Enberg <penberg@kernel.org>, palmer@dabbelt.com
Subject: [PATCH 7/8] riscv/mm/fault: Move FAULT_FLAG_WRITE handling in do_page_fault()
Date: Tue, 25 Aug 2020 21:39:06 +0300 [thread overview]
Message-ID: <20200825183907.275950-8-penberg@gmail.com> (raw)
In-Reply-To: <20200825183907.275950-1-penberg@gmail.com>
From: Pekka Enberg <penberg@kernel.org>
Let's handle the translation of EXC_STORE_PAGE_FAULT to FAULT_FLAG_WRITE
once before looking up the VMA. This makes it easier to extract access
error logic in the next patch.
---
arch/riscv/mm/fault.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c
index 3b430fb18de3..bdc70d3d507f 100644
--- a/arch/riscv/mm/fault.c
+++ b/arch/riscv/mm/fault.c
@@ -208,6 +208,9 @@ asmlinkage void do_page_fault(struct pt_regs *regs)
perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, addr);
+ if (cause == EXC_STORE_PAGE_FAULT)
+ flags |= FAULT_FLAG_WRITE;
+
retry:
mmap_read_lock(mm);
vma = find_vma(mm, addr);
@@ -251,7 +254,6 @@ asmlinkage void do_page_fault(struct pt_regs *regs)
bad_area(regs, mm, code, addr);
return;
}
- flags |= FAULT_FLAG_WRITE;
break;
default:
panic("%s: unhandled cause %lu", __func__, cause);
--
2.26.2
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next prev parent reply other threads:[~2020-08-25 18:39 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-25 18:38 [PATCH 0/8] riscv/mm/fault: Page fault handler cleanups Pekka Enberg
2020-08-25 18:39 ` [PATCH 1/8] riscv/mm/fault: Move no context handling to no_context() Pekka Enberg
2020-08-25 18:39 ` [PATCH 2/8] riscv/mm/fault: Move bad area handling to bad_area() Pekka Enberg
2020-08-25 18:39 ` [PATCH 3/8] riscv/mm/fault: Move vmalloc fault handling to vmalloc_fault() Pekka Enberg
2020-08-25 18:39 ` [PATCH 4/8] riscv/mm/fault: Simplify fault error handling Pekka Enberg
2020-08-25 18:39 ` [PATCH 5/8] riscv/mm/fault: Move fault error handling to mm_fault_error() Pekka Enberg
2020-08-25 18:39 ` [PATCH 6/8] riscv/mm/fault: Simplify mm_fault_error() Pekka Enberg
2020-08-25 18:39 ` Pekka Enberg [this message]
2020-08-25 18:39 ` [PATCH 8/8] riscv/mm/fault: Move access error check to function Pekka Enberg
2020-08-25 19:08 ` [PATCH 0/8] riscv/mm/fault: Page fault handler cleanups Pekka Enberg
2020-09-04 17:37 ` Palmer Dabbelt
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