linux-kernel - [PATCH] um: Fix _print

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Message-Id: <20170312101340.21681-1-richard@nod.at>
Date:   Sun, 12 Mar 2017 11:13:40 +0100
From:   Richard Weinberger <richard@....at>
To:     linux-kernel@...r.kernel.org
Cc:     user-mode-linux-devel@...ts.sourceforge.net,
        Richard Weinberger <richard@....at>, stable@...r.kernel.org,
        Vegard Nossum <vegard.nossum@...cle.com>
Subject: [PATCH] um: Fix _print_addr()

Recent changes to printk() broke UML's stack trace
output. Kill the root of the problem by using a single
printk() statement.

Fixes: 4bcc595ccd80decb ("printk: reinstate KERN_CONT for printing
continuation lines")
Cc: stable@...r.kernel.org
Cc: Vegard Nossum <vegard.nossum@...cle.com>
Tested-by: Vegard Nossum <vegard.nossum@...cle.com>
Reported-by: Vegard Nossum <vegard.nossum@...cle.com>
Signed-off-by: Richard Weinberger <richard@....at>

---
 arch/um/kernel/sysrq.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/um/kernel/sysrq.c b/arch/um/kernel/sysrq.c
index a76295f7ede9..961be4a51511 100644
--- a/arch/um/kernel/sysrq.c
+++ b/arch/um/kernel/sysrq.c
@@ -20,10 +20,8 @@
 
 static void _print_addr(void *data, unsigned long address, int reliable)
 {
-	pr_info(" [<%08lx>]", address);
-	pr_cont(" %s", reliable ? "" : "? ");
-	print_symbol("%s", address);
-	pr_cont("\n");
+	pr_info(" [<%08lx>] %s%pB\n", address, reliable ? "" : "? ",
+		(void *)address);
 }
 
 static const struct stacktrace_ops stackops = {
-- 
2.10.2