linux-kernel - [PATCH 1/6] kernel/debug: Make use of KGDB_REASON

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Message-Id: <1341529960-18370-1-git-send-email-anton.vorontsov@linaro.org>
Date:	Thu,  5 Jul 2012 16:12:35 -0700
From:	Anton Vorontsov <anton.vorontsov@...aro.org>
To:	Russell King <linux@....linux.org.uk>,
	Jason Wessel <jason.wessel@...driver.com>
Cc:	Arve Hjønnevåg <arve@...roid.com>,
	Colin Cross <ccross@...roid.com>,
	John Stultz <john.stultz@...aro.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linaro-kernel@...ts.linaro.org, patches@...aro.org,
	kernel-team@...roid.com, kgdb-bugreport@...ts.sourceforge.net
Subject: [PATCH 1/6] kernel/debug: Make use of KGDB_REASON_NMI

Currently kernel never set KGDB_REASON_NMI. We do now, when we enter
KGDB/KDB from an NMI.

This is not to be confused with kgdb_nmicallback(), NMI callback is
an entry for the slave CPUs during CPUs roundup, but REASON_NMI is the
entry for the master CPU.

Signed-off-by: Anton Vorontsov <anton.vorontsov@...aro.org>
---
 kernel/debug/kdb/kdb_debugger.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/debug/kdb/kdb_debugger.c b/kernel/debug/kdb/kdb_debugger.c
index 8b68ce7..be7b33b 100644
--- a/kernel/debug/kdb/kdb_debugger.c
+++ b/kernel/debug/kdb/kdb_debugger.c
@@ -12,6 +12,7 @@
 #include <linux/kdb.h>
 #include <linux/kdebug.h>
 #include <linux/export.h>
+#include <linux/hardirq.h>
 #include "kdb_private.h"
 #include "../debug_core.h"
 
@@ -52,6 +53,9 @@ int kdb_stub(struct kgdb_state *ks)
 	if (atomic_read(&kgdb_setting_breakpoint))
 		reason = KDB_REASON_KEYBOARD;
 
+	if (in_nmi())
+		reason = KDB_REASON_NMI;
+
 	for (i = 0, bp = kdb_breakpoints; i < KDB_MAXBPT; i++, bp++) {
 		if ((bp->bp_enabled) && (bp->bp_addr == addr)) {
 			reason = KDB_REASON_BREAK;
-- 
1.7.10.4

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