linux-kernel - [tip:x86/mm] x86/fault: Make fault messages more succinct

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Date:   Sun, 21 Apr 2019 11:52:13 -0700
From:   tip-bot for Borislav Petkov <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     torvalds@...ux-foundation.org, mingo@...nel.org, hpa@...or.com,
        peterz@...radead.org, linux-kernel@...r.kernel.org,
        tglx@...utronix.de, bp@...e.de
Subject: [tip:x86/mm] x86/fault: Make fault messages more succinct

Commit-ID:  ea2f8d60603efbd1cb4e193a593945a2fe24d264
Gitweb:     https://git.kernel.org/tip/ea2f8d60603efbd1cb4e193a593945a2fe24d264
Author:     Borislav Petkov <bp@...e.de>
AuthorDate: Sun, 21 Apr 2019 20:35:24 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Sun, 21 Apr 2019 20:48:51 +0200

x86/fault: Make fault messages more succinct

So we are going to be staring at those in the next years, let's make
them more succinct. In particular:

 - change "address = " to "address: "

 - "-privileged" reads funny. It should be simply "kernel" or "user"

 - "from kernel code" reads funny too. "kernel mode" or "user mode" is
   more natural.

An actual example says more than 1000 words, of course:

  [    0.248370] BUG: kernel NULL pointer dereference, address: 00000000000005b8
  [    0.249120] #PF: supervisor write access in kernel mode
  [    0.249717] #PF: error_code(0x0002) - not-present page

Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: dave.hansen@...ux.intel.com
Cc: luto@...nel.org
Cc: riel@...riel.com
Cc: sean.j.christopherson@...el.com
Cc: yu-cheng.yu@...el.com
Link: http://lkml.kernel.org/r/20190421183524.GC6048@zn.tnic
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/mm/fault.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 74c9204c5751..a0df19b0897d 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -630,13 +630,13 @@ show_fault_oops(struct pt_regs *regs, unsigned long error_code, unsigned long ad
 	}
 
 	if (address < PAGE_SIZE && !user_mode(regs))
-		pr_alert("BUG: kernel NULL pointer dereference, address = %px\n",
+		pr_alert("BUG: kernel NULL pointer dereference, address: %px\n",
 			(void *)address);
 	else
-		pr_alert("BUG: unable to handle page fault for address = %px\n",
+		pr_alert("BUG: unable to handle page fault for address: %px\n",
 			(void *)address);
 
-	pr_alert("#PF: %s-privileged %s from %s code\n",
+	pr_alert("#PF: %s %s in %s mode\n",
 		 (error_code & X86_PF_USER)  ? "user" : "supervisor",
 		 (error_code & X86_PF_INSTR) ? "instruction fetch" :
 		 (error_code & X86_PF_WRITE) ? "write access" :