lkml.org 
[lkml]   [2015]   [May]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Subject[PATCH] ARM: socfpga: add smp_ops.cpu_kill to make kexec/kdump available
From
Date
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@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 | 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
};


\
 
 \ /
  Last update: 2015-05-29 08:41    [W:0.051 / U:43.696 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site