diff options
| author | Hiraku Toyooka <hiraku.toyooka.gu@hitachi.com> | 2015-06-10 07:47:19 +0000 |
|---|---|---|
| committer | Dinh Nguyen <dinguyen@opensource.altera.com> | 2015-07-07 13:39:24 -0500 |
| commit | b33612e183dcbaa2cc2479cedff6984a6cccdf6a (patch) | |
| tree | 0c57e1f0a6e79f7a1bba1e3252e004467835a872 /arch/arm/mach-socfpga | |
| parent | d770e558e21961ad6cfdf0ff7df0eb5d7d4f0754 (diff) | |
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: 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
Link: http://lists.infradead.org/pipermail/linux-arm-kernel/2015-June/348004.html
Signed-off-by: Dinh Nguyen <dinguyen@opensource.altera.com>
Diffstat (limited to 'arch/arm/mach-socfpga')
| -rw-r--r-- | arch/arm/mach-socfpga/platsmp.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/arm/mach-socfpga/platsmp.c b/arch/arm/mach-socfpga/platsmp.c index c6f1df89f9af..15c8ce8965f4 100644 --- a/arch/arm/mach-socfpga/platsmp.c +++ b/arch/arm/mach-socfpga/platsmp.c @@ -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 }; |