linux-kernel - [RESEND PATCH 3.17rc1] kdb: Remove stack dump when entering kgdb due to NMI

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Message-Id: <1408374541-13066-1-git-send-email-daniel.thompson@linaro.org>
Date:	Mon, 18 Aug 2014 16:09:01 +0100
From:	Daniel Thompson <daniel.thompson@...aro.org>
To:	Jason Wessel <jason.wessel@...driver.com>
Cc:	Daniel Thompson <daniel.thompson@...aro.org>,
	linux-kernel@...r.kernel.org, patches@...aro.org,
	linaro-kernel@...ts.linaro.org, Mike Travis <travis@....com>,
	Ingo Molnar <mingo@...hat.com>,
	kgdb-bugreport@...ts.sourceforge.net
Subject: [RESEND PATCH 3.17rc1] kdb: Remove stack dump when entering kgdb due to NMI

Issuing a stack dump feels ergonomically wrong when entering due to NMI.

Entering due to NMI is a normally reaction to a user request, either the
NMI button on a server or a "magic knock" on a UART. Therefore the
backtrace behaviour on entry due to NMI should be like SysRq-g (no stack
dump) rather than like oops.

Note also that the stack dump does not offer any information that
cannot be trivial retrieved using the 'bt' command.

Signed-off-by: Daniel Thompson <daniel.thompson@...aro.org>
Cc: Jason Wessel <jason.wessel@...driver.com>
Cc: Mike Travis <travis@....com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: kgdb-bugreport@...ts.sourceforge.net
---
 kernel/debug/kdb/kdb_main.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index 379650b..f9ba423 100644
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -1207,7 +1207,6 @@ static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs,
 		kdb_printf("due to NonMaskable Interrupt @ "
 			   kdb_machreg_fmt "\n",
 			   instruction_pointer(regs));
-		kdb_dumpregs(regs);
 		break;
 	case KDB_REASON_SSTEP:
 	case KDB_REASON_BREAK:
--
1.9.3

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