From mboxrd@z Thu Jan 1 00:00:00 1970 From: daniel.thompson@linaro.org (Daniel Thompson) Date: Fri, 18 Dec 2015 11:20:41 +0000 Subject: [PATCH 2/2] ARM: Make IPI_CPU_BACKTRACE a "non-secure" SGI In-Reply-To: <1450430173-26992-3-git-send-email-marc.zyngier@arm.com> References: <1450430173-26992-1-git-send-email-marc.zyngier@arm.com> <1450430173-26992-3-git-send-email-marc.zyngier@arm.com> Message-ID: <5673EC09.8090909@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 18/12/15 09:16, Marc Zyngier wrote: > 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 Tested-by: Daniel Thompson > --- > arch/arm/kernel/smp.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c > index d50a77d..fe517f1 100644 > --- a/arch/arm/kernel/smp.c > +++ b/arch/arm/kernel/smp.c > @@ -72,7 +72,7 @@ enum ipi_msg_type { > IPI_CPU_STOP, > IPI_IRQ_WORK, > IPI_COMPLETION, > - IPI_CPU_BACKTRACE = 15, > + IPI_CPU_BACKTRACE, > }; > > static DECLARE_COMPLETION(cpu_running); >