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ARM: stop: execute platform callback from cpu_stop code

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Sending IPI_CPU_STOP to a CPU causes it to execute a busy cpu_relax
loop forever. This makes it impossible to kexec successfully on an SMP
system since the secondary CPUs do not reset.

This patch adds a callback to platform_cpu_kill, defined when
CONFIG_HOTPLUG_CPU=y, from the ipi_cpu_stop handling code. This function
currently just returns 1 on all platforms that define it but allows them
to do something more sophisticated in the future.

Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2011-06-06 15:49:23 +01:00
parent 290130a177
commit 02b73e2e9c
2 changed files with 5 additions and 1 deletions
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2
arch/arm/Kconfig
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@ -2001,7 +2001,7 @@ config XIP_PHYS_ADDR
config KEXEC
bool "Kexec system call (EXPERIMENTAL)"
depends on EXPERIMENTAL
depends on EXPERIMENTAL && (!SMP || HOTPLUG_CPU)
help
kexec is a system call that implements the ability to shutdown your
current kernel, and to start another kernel. It is like a reboot

4
arch/arm/kernel/smp.c
View File

@ -522,6 +522,10 @@ static void ipi_cpu_stop(unsigned int cpu)
local_fiq_disable();
local_irq_disable();
#ifdef CONFIG_HOTPLUG_CPU
platform_cpu_kill(cpu);
#endif
while (1)
cpu_relax();
}