linux-kernel - [PATCH v3 1/2] riscv/mm: Introduce a die_kernel

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Date:   Fri, 4 Dec 2020 13:42:58 +0800
From:   Eric Lin <tesheng@...estech.com>
To:     <linux-kernel@...r.kernel.org>, <linux-riscv@...ts.infradead.org>,
        <walken@...gle.com>, <vbabka@...e.cz>, <peterx@...hat.com>,
        <akpm@...ux-foundation.org>, <penberg@...nel.org>,
        <aou@...s.berkeley.edu>, <palmer@...belt.com>,
        <paul.walmsley@...ive.com>
CC:     Eric Lin <tesheng@...estech.com>, Alan Kao <alankao@...estech.com>
Subject: [PATCH v3 1/2] riscv/mm: Introduce a die_kernel_fault() helper function

Like arm64, this patch adds a die_kernel_fault() helper
to ensure the same semantics for the different kernel faults.

Signed-off-by: Eric Lin <tesheng@...estech.com>
Cc: Alan Kao <alankao@...estech.com>
Reviewed-by: Pekka Enberg <penberg@...nel.org>
---
 arch/riscv/mm/fault.c | 23 +++++++++++++++++------
 1 file changed, 17 insertions(+), 6 deletions(-)

diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c
index 3c8b9e433c67..0d5f06d6e3c7 100644
--- a/arch/riscv/mm/fault.c
+++ b/arch/riscv/mm/fault.c
@@ -19,8 +19,23 @@
 
 #include "../kernel/head.h"
 
+static void die_kernel_fault(const char *msg, unsigned long addr,
+		struct pt_regs *regs)
+{
+	bust_spinlocks(1);
+
+	pr_alert("Unable to handle kernel %s at virtual address " REG_FMT "\n", msg,
+		addr);
+
+	bust_spinlocks(0);
+	die(regs, "Oops");
+	do_exit(SIGKILL);
+}
+
 static inline void no_context(struct pt_regs *regs, unsigned long addr)
 {
+	const char *msg;
+
 	/* Are we prepared to handle this kernel fault? */
 	if (fixup_exception(regs))
 		return;
@@ -29,12 +44,8 @@ static inline void no_context(struct pt_regs *regs, unsigned long addr)
 	 * Oops. The kernel tried to access some bad page. We'll have to
 	 * terminate things with extreme prejudice.
 	 */
-	bust_spinlocks(1);
-	pr_alert("Unable to handle kernel %s at virtual address " REG_FMT "\n",
-		(addr < PAGE_SIZE) ? "NULL pointer dereference" :
-		"paging request", addr);
-	die(regs, "Oops");
-	do_exit(SIGKILL);
+	msg = (addr < PAGE_SIZE) ? "NULL pointer dereference" : "paging request";
+	die_kernel_fault(msg, addr, regs);
 }
 
 static inline void mm_fault_error(struct pt_regs *regs, unsigned long addr, vm_fault_t fault)
-- 
2.17.0