From: Wang Kefeng <wangkefeng.wang@huawei.com>
Date: Wed, 22 Sep 2021 13:56:31 +0000 (+0100)
Subject: ARM: 9130/1: mm: Provide die_kernel_fault() helper
X-Git-Tag: v6.1-rc5~2761^2^3~12
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=2e707106fac7f81f780d7c76770a726c46757a84;p=platform%2Fkernel%2Flinux-starfive.git

ARM: 9130/1: mm: Provide die_kernel_fault() helper

Provide die_kernel_fault() helper to do the kernel fault reporting,
which with msg argument, it could report different message in different
scenes, and the later patch "ARM: mm: Fix PXN process with LPAE feature"
will use it.

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---

diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
index 76aced0..82bcfe5 100644
--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -99,6 +99,21 @@ void show_pte(const char *lvl, struct mm_struct *mm, unsigned long addr)
 { }
 #endif					/* CONFIG_MMU */
 
+static void die_kernel_fault(const char *msg, struct mm_struct *mm,
+			     unsigned long addr, unsigned int fsr,
+			     struct pt_regs *regs)
+{
+	bust_spinlocks(1);
+	pr_alert("8<--- cut here ---\n");
+	pr_alert("Unable to handle kernel %s at virtual address %08lx\n",
+		 msg, addr);
+
+	show_pte(KERN_ALERT, mm, addr);
+	die("Oops", regs, fsr);
+	bust_spinlocks(0);
+	do_exit(SIGKILL);
+}
+
 /*
  * Oops.  The kernel tried to access some page that wasn't present.
  */
@@ -106,6 +121,7 @@ static void
 __do_kernel_fault(struct mm_struct *mm, unsigned long addr, unsigned int fsr,
 		  struct pt_regs *regs)
 {
+	const char *msg;
 	/*
 	 * Are we prepared to handle this kernel fault?
 	 */
@@ -115,16 +131,12 @@ __do_kernel_fault(struct mm_struct *mm, unsigned long addr, unsigned int fsr,
 	/*
 	 * No handler, we'll have to terminate things with extreme prejudice.
 	 */
-	bust_spinlocks(1);
-	pr_alert("8<--- cut here ---\n");
-	pr_alert("Unable to handle kernel %s at virtual address %08lx\n",
-		 (addr < PAGE_SIZE) ? "NULL pointer dereference" :
-		 "paging request", addr);
+	if (addr < PAGE_SIZE)
+		msg = "NULL pointer dereference";
+	else
+		msg = "paging request";
 
-	show_pte(KERN_ALERT, mm, addr);
-	die("Oops", regs, fsr);
-	bust_spinlocks(0);
-	do_exit(SIGKILL);
+	die_kernel_fault(msg, mm, addr, fsr, regs);
 }
 
 /*