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| author | Marc Zyngier <Marc.Zyngier@arm.com> | 2015-12-18 13:06:47 +0300 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2015-12-22 15:09:44 +0300 |
| commit | e7273ff49acf58a5ca9c656f3f0a5dd713390853 (patch) | |
| tree | 75cc4807ba19b6a0a2cc2ba30763c7854096ac3c | |
| parent | 89d798b73dc64b3be2a653cabb4cb622675a9a36 (diff) | |
| download | linux-e7273ff49acf58a5ca9c656f3f0a5dd713390853.tar.xz | |
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>
| -rw-r--r-- | arch/arm/kernel/smp.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index d50a77d638d3..37312f6749f3 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -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); |