[tip:x86/asm] x86/entry/traps: Show unhandled signal for i386 in do_trap()

From: tip-bot for Jianyu Zhan
Date: Thu Mar 10 2016 - 13:32:16 EST

Commit-ID: 10ee73865e9e4705ba8b3f4d6149e8e68d902bb7
Gitweb: http://git.kernel.org/tip/10ee73865e9e4705ba8b3f4d6149e8e68d902bb7
Author: Jianyu Zhan <nasa4836@xxxxxxxxx>
AuthorDate: Thu, 10 Mar 2016 20:19:58 +0800
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Thu, 10 Mar 2016 18:37:25 +0100

x86/entry/traps: Show unhandled signal for i386 in do_trap()

Commit abd4f7505baf ("x86: i386-show-unhandled-signals-v3") did turn on
the showing-unhandled-signal behaviour for i386 for some exception handlers,
but for no reason do_trap() is left out (my naive guess is because turning it on
for do_trap() would be too noisy since do_trap() is shared by several exceptions).

And since the same commit make "show_unhandled_signals" a debug tunable(in
/proc/sys/debug/exception-trace), and x86 by default turning it on.

So it would be strange for i386 users who turing it on manually and expect
seeing the unhandled signal output in log, but nothing.

This patch turns it on for i386 in do_trap() as well.

Signed-off-by: Jianyu Zhan <nasa4836@xxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Brian Gerst <brgerst@xxxxxxxxx>
Cc: Denys Vlasenko <dvlasenk@xxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: bp@xxxxxxx
Cc: dave.hansen@xxxxxxxxxxxxxxx
Cc: heukelum@xxxxxxxxxxx
Cc: jbeulich@xxxxxxxxxx
Cc: jdike@xxxxxxxxxxx
Cc: joe@xxxxxxxxxxx
Cc: luto@xxxxxxxxxx
Link: http://lkml.kernel.org/r/1457612398-4568-1-git-send-email-nasa4836@xxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
arch/x86/kernel/traps.c | 2 --
1 file changed, 2 deletions(-)

diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 5fae2d8..1baf081 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -248,7 +248,6 @@ do_trap(int trapnr, int signr, char *str, struct pt_regs *regs,
tsk->thread.error_code = error_code;
tsk->thread.trap_nr = trapnr;

-#ifdef CONFIG_X86_64
if (show_unhandled_signals && unhandled_signal(tsk, signr) &&
printk_ratelimit()) {
pr_info("%s[%d] trap %s ip:%lx sp:%lx error:%lx",
@@ -257,7 +256,6 @@ do_trap(int trapnr, int signr, char *str, struct pt_regs *regs,
print_vma_addr(" in ", regs->ip);

force_sig_info(signr, info ?: SEND_SIG_PRIV, tsk);