linux-kernel - [tip:x86/urgent] x86/mm: Get rid of KERN_CONT in show_fault

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Date:   Tue, 26 Jun 2018 03:25:01 -0700
From:   tip-bot for Dmitry Vyukov <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, linux-kernel@...r.kernel.org,
        sergey.senozhatsky@...il.com, brgerst@...il.com,
        peterz@...radead.org, hpa@...or.com, luto@...nel.org,
        dvyukov@...gle.com, mingo@...nel.org,
        torvalds@...ux-foundation.org, jpoimboe@...hat.com,
        dvlasenk@...hat.com, bp@...en8.de
Subject: [tip:x86/urgent] x86/mm: Get rid of KERN_CONT in show_fault_oops()

Commit-ID:  4188f063e3694ccbf2a2044cf17cc325f91e458f
Gitweb:     https://git.kernel.org/tip/4188f063e3694ccbf2a2044cf17cc325f91e458f
Author:     Dmitry Vyukov <dvyukov@...gle.com>
AuthorDate: Mon, 25 Jun 2018 14:38:08 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 26 Jun 2018 09:00:25 +0200

x86/mm: Get rid of KERN_CONT in show_fault_oops()

KERN_CONT leads to split lines in kernel output
and complicates useful changes to printk like
printing context before each line.

Only acceptable use of continuations is basically
boot-time testing.

Get rid of it.

Signed-off-by: Dmitry Vyukov <dvyukov@...gle.com>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/20180625123808.227417-1-dvyukov@gmail.com
[ Removed unnecessary parentheses and prettified the printk statement. ]
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/mm/fault.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 9a84a0d08727..ee85766e6329 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -671,13 +671,9 @@ show_fault_oops(struct pt_regs *regs, unsigned long error_code,
 			printk(smep_warning, from_kuid(&init_user_ns, current_uid()));
 	}
 
-	printk(KERN_ALERT "BUG: unable to handle kernel ");
-	if (address < PAGE_SIZE)
-		printk(KERN_CONT "NULL pointer dereference");
-	else
-		printk(KERN_CONT "paging request");
-
-	printk(KERN_CONT " at %px\n", (void *) address);
+	pr_alert("BUG: unable to handle kernel %s at %px\n",
+		 address < PAGE_SIZE ? "NULL pointer dereference" : "paging request",
+		 (void *)address);
 
 	dump_pagetable(address);
 }