Commit e7273ff4 authored Dec 18, 2015 by Marc Zyngier Committed by Russell King Dec 22, 2015

ARM: 8488/1: Make IPI_CPU_BACKTRACE a "non-secure" SGI



Having IPI_CPU_BACKTRACE as SGI15 may not work if the kernel is
running in non-secure mode and that the secure firmware has
decided to follow ARM's recommendations that SGI8-15 should
be reserved for secure purpose.

Now that we are "only" using SGI0-6, change IPI_CPU_BACKTRACE
to use SGI7, which makes it more likely to work.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

parent 89d798b7

arch/arm/kernel/smp.c

+6 −1

Original line number	Original line	Diff line number	Diff line
	@@ -72,7 +72,12 @@ enum ipi_msg_type {
	IPI_CPU_STOP,		IPI_CPU_STOP,
	IPI_IRQ_WORK,		IPI_IRQ_WORK,
	IPI_COMPLETION,		IPI_COMPLETION,
	IPI_CPU_BACKTRACE = 15,		IPI_CPU_BACKTRACE,
			/*
			* SGI8-15 can be reserved by secure firmware, and thus may
			* not be usable by the kernel. Please keep the above limited
			* to at most 8 entries.
			*/
	};		};

	static DECLARE_COMPLETION(cpu_running);		static DECLARE_COMPLETION(cpu_running);