From: Wang Kefeng <wangkefeng.wang@huawei.com>
Date: Tue, 11 Oct 2022 01:34:05 +0000 (+0100)
Subject: ARM: 9254/1: mm: Provide better message when kernel fault
X-Git-Tag: v6.6.7~3915^2~28
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b40b84b120f5cb5f8c6de0b404ffb68cf72b7c90;p=platform%2Fkernel%2Flinux-starfive.git

ARM: 9254/1: mm: Provide better message when kernel fault

If there is a kernel fault, see do_kernel_fault(), we only print
the generic "paging request" or "NULL pointer dereference" message
which don't show read, write or excute information, let's provide
better fault message for them.

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 46cccd6..f8fe0ec6 100644
--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -111,8 +111,9 @@ static void die_kernel_fault(const char *msg, struct mm_struct *mm,
 {
 	bust_spinlocks(1);
 	pr_alert("8<--- cut here ---\n");
-	pr_alert("Unable to handle kernel %s at virtual address %08lx\n",
-		 msg, addr);
+	pr_alert("Unable to handle kernel %s at virtual address %08lx when %s\n",
+		 msg, addr, fsr & FSR_LNX_PF ? "execute" :
+		 fsr & FSR_WRITE ? "write" : "read");
 
 	show_pte(KERN_ALERT, mm, addr);
 	die("Oops", regs, fsr);