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

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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>
This commit is contained in:
Marc Zyngier 2015-12-18 11:06:47 +01:00 committed by Russell King
parent 89d798b73d
commit e7273ff49a
1 changed files with 6 additions and 1 deletions
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7
arch/arm/kernel/smp.c
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@ -72,7 +72,12 @@ enum ipi_msg_type {
IPI_CPU_STOP,
IPI_IRQ_WORK,
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);