Messages in this thread Patch in this message | | | Subject | [PATCH v2] ARM: socfpga: add smp_ops.cpu_kill to make kexec/kdump available | From | Hiraku Toyooka <> | Date | Wed, 10 Jun 2015 16:47:19 +0900 |
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Kexec_load syscall in ARM requires that machine-specific code has the smp_ops.cpu_kill() before loading kernel image. This patch adds the cpu_kill(), as a result, kexec reboot and kernel crash dump become available in mach-socfpga.
Signed-off-by: Hiraku Toyooka <hiraku.toyooka.gu@hitachi.com> Cc: Dinh Nguyen <dinguyen@opensource.altera.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org --- arch/arm/mach-socfpga/platsmp.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/arch/arm/mach-socfpga/platsmp.c b/arch/arm/mach-socfpga/platsmp.c index c64d89b..3caf7c3 100644 --- a/arch/arm/mach-socfpga/platsmp.c +++ b/arch/arm/mach-socfpga/platsmp.c @@ -95,11 +95,23 @@ static void socfpga_cpu_die(unsigned int cpu) cpu_do_idle(); } +/* + * We need a dummy function so that platform_can_cpu_hotplug() knows + * we support CPU hotplug. However, the function does not need to do + * anything, because CPUs going offline just do WFI. We could reset + * the CPUs but it would increase power consumption. + */ +static int socfpga_cpu_kill(unsigned int cpu) +{ + return 1; +} + struct smp_operations socfpga_smp_ops __initdata = { .smp_init_cpus = socfpga_smp_init_cpus, .smp_prepare_cpus = socfpga_smp_prepare_cpus, .smp_boot_secondary = socfpga_boot_secondary, #ifdef CONFIG_HOTPLUG_CPU .cpu_die = socfpga_cpu_die, + .cpu_kill = socfpga_cpu_kill, #endif };
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