linux-kernel - [PATCH] arch/tile: implement panic_smp_self

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Message-Id: <201203302105.q2UL57XA006301@farm-0012.internal.tilera.com>
Date:	Thu, 29 Mar 2012 15:59:11 -0400
From:	Chris Metcalf <cmetcalf@...era.com>
To:	Chris Metcalf <cmetcalf@...era.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Jesper Nilsson <jesper.nilsson@...s.com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] arch/tile: implement panic_smp_self_stop()

This allows the later-panicking tiles to wait in a lower power state
until they get interrupted with an smp_send_stop().

Signed-off-by: Chris Metcalf <cmetcalf@...era.com>
---
 arch/tile/kernel/smp.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/arch/tile/kernel/smp.c b/arch/tile/kernel/smp.c
index f86887a..5b46a12 100644
--- a/arch/tile/kernel/smp.c
+++ b/arch/tile/kernel/smp.c
@@ -132,6 +132,12 @@ void smp_send_stop(void)
 	send_IPI_allbutself(MSG_TAG_STOP_CPU);
 }
 
+/* On panic, just wait; we may get an smp_send_stop() later on. */
+void panic_smp_self_stop(void)
+{
+	while (1)
+		asm("nap; nop");
+}
 
 /*
  * Dispatch code called from hv_message_intr() for HV_MSG_TILE hv messages.
-- 
1.6.5.2

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