linux-kernel - [PATCH 19/29] csky: mm: abort uaccess retries upon fatal signal

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Message-Id: <20210121065349.3188251-19-guoren@kernel.org>
Date:   Thu, 21 Jan 2021 14:53:39 +0800
From:   guoren@...nel.org
To:     guoren@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-csky@...r.kernel.org,
        Guo Ren <guoren@...ux.alibaba.com>,
        Mark Rutland <mark.rutland@....com>
Subject: [PATCH 19/29] csky: mm: abort uaccess retries upon fatal signal

From: Guo Ren <guoren@...ux.alibaba.com>

Pick up the patch from the 'Link' made by Mark Rutland. Keep the
same with x86, arm, arm64, arc, sh, power.

Link: https://lore.kernel.org/linux-arm-kernel/1499782763-31418-1-git-send-email-mark.rutland@arm.com/
Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
Cc: Mark Rutland <mark.rutland@....com>
---
 arch/csky/mm/fault.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/csky/mm/fault.c b/arch/csky/mm/fault.c
index c7b67976bac4..1482de56f4f7 100644
--- a/arch/csky/mm/fault.c
+++ b/arch/csky/mm/fault.c
@@ -279,8 +279,11 @@ asmlinkage void do_page_fault(struct pt_regs *regs)
 	 * signal first. We do not need to release the mmap_lock because it
 	 * would already be released in __lock_page_or_retry in mm/filemap.c.
 	 */
-	if (fault_signal_pending(fault, regs))
+	if (fault_signal_pending(fault, regs)) {
+		if (!user_mode(regs))
+			no_context(regs, addr);
 		return;
+	}
 
 	if (unlikely((fault & VM_FAULT_RETRY) && (flags & FAULT_FLAG_ALLOW_RETRY))) {
 		flags |= FAULT_FLAG_TRIED;
-- 
2.17.1