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Commit b33612e1 authored by Hiraku Toyooka's avatar Hiraku Toyooka Committed by Dinh Nguyen
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ARM: socfpga: add smp_ops.cpu_kill to make kexec/kdump available 



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: default avatarHiraku 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
Link: http://lists.infradead.org/pipermail/linux-arm-kernel/2015-June/348004.html


Signed-off-by: default avatarDinh Nguyen <dinguyen@opensource.altera.com>
parent d770e558

arch/arm/mach-socfpga/platsmp.c

+13 −0
Original line number Diff line number Diff line
@@ -106,11 +106,23 @@ 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;

}



static struct smp_operations socfpga_smp_ops __initdata = {

	.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

};
@@ -119,6 +131,7 @@ static struct smp_operations socfpga_a10_smp_ops __initdata = { 
	.smp_boot_secondary	= socfpga_a10_boot_secondary,

#ifdef CONFIG_HOTPLUG_CPU

	.cpu_die		= socfpga_cpu_die,

	.cpu_kill		= socfpga_cpu_kill,

#endif

};