linux-kernel - [PATCH v2 05/10] powerpc/traps: Print VMA for unhandled signals

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Date:   Fri, 27 Jul 2018 11:58:06 -0300
From:   Murilo Opsfelder Araujo <muriloo@...ux.ibm.com>
To:     linux-kernel@...r.kernel.org
Cc:     "Alastair D'Silva" <alastair@...ilva.org>,
        Andrew Donnellan <andrew.donnellan@....ibm.com>,
        Balbir Singh <bsingharora@...il.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christophe Leroy <christophe.leroy@....fr>,
        Cyril Bur <cyrilbur@...il.com>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Michael Neuling <mikey@...ling.org>,
        Murilo Opsfelder Araujo <muriloo@...ux.ibm.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Paul Mackerras <paulus@...ba.org>,
        Simon Guo <wei.guo.simon@...il.com>,
        Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
        "Tobin C . Harding" <me@...in.cc>, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v2 05/10] powerpc/traps: Print VMA for unhandled signals

This adds VMA address in the message printed for unhandled signals,
similarly to what other architectures, like x86, print.

Before this patch, a page fault looked like:

    pandafault[61470]: unhandled signal 11 at 00000000100007d0 nip 000000001000061c lr 00007fff8d185100 code 2

After this patch, a page fault looks like:

    pandafault[6303]: unhandled signal 11 at 00000000100007d0 nip 000000001000061c lr 00007fff93c55100 code 2 in pandafault[10000000+10000]

Signed-off-by: Murilo Opsfelder Araujo <muriloo@...ux.ibm.com>
---
 arch/powerpc/kernel/traps.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 047d980ac776..e6c43ef9fb50 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -315,9 +315,13 @@ static void show_signal_msg(int signr, struct pt_regs *regs, int code,
 		return;
 
 	pr_info("%s[%d]: unhandled signal %d at "REG_FMT \
-		" nip "REG_FMT" lr "REG_FMT" code %x\n",
+		" nip "REG_FMT" lr "REG_FMT" code %x",
 		current->comm, current->pid, signr, addr,
 		regs->nip, regs->link, code);
+
+	print_vma_addr(KERN_CONT " in ", regs->nip);
+
+	pr_cont("\n");
 }
 
 void _exception_pkey(int signr, struct pt_regs *regs, int code,
-- 
2.17.1