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Message-ID: <20150529053844.31162.43927.stgit@arietta>
Date: Fri, 29 May 2015 14:38:44 +0900
From: Hiraku Toyooka <hiraku.toyooka.gu@...achi.com>
To: dinguyen@...nsource.altera.com, linux@....linux.org.uk
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH] ARM: socfpga: add smp_ops.cpu_kill to make kexec/kdump
available
Kexec_load syscall in ARM checks 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@...achi.com>
Cc: Dinh Nguyen <dinguyen@...nsource.altera.com>
Cc: Russell King <linux@....linux.org.uk>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
---
arch/arm/mach-socfpga/platsmp.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/arch/arm/mach-socfpga/platsmp.c b/arch/arm/mach-socfpga/platsmp.c
index c64d89b..a8f0f84 100644
--- a/arch/arm/mach-socfpga/platsmp.c
+++ b/arch/arm/mach-socfpga/platsmp.c
@@ -95,11 +95,22 @@ 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.
+ */
+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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