diff options
| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-01-06 22:31:35 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-01-06 22:32:03 +0000 |
| commit | 4ec3eb13634529c0bc7466658d84d0bbe3244aea (patch) | |
| tree | b491daac2ccfc7b8ca88e171a43f66888463568a /arch/arm/vfp | |
| parent | 24056f525051a9e186af28904b396320e18bf9a0 (diff) | |
| parent | 15095bb0fe779c0403091bda7adce5fb3bb9ca35 (diff) | |
Merge branch 'smp' into misc
Conflicts:
arch/arm/kernel/entry-armv.S
arch/arm/mm/ioremap.c
Diffstat (limited to 'arch/arm/vfp')
| -rw-r--r-- | arch/arm/vfp/vfpmodule.c | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c index 8063a322c790..0797cb528b46 100644 --- a/arch/arm/vfp/vfpmodule.c +++ b/arch/arm/vfp/vfpmodule.c @@ -10,9 +10,12 @@ */ #include <linux/module.h> #include <linux/types.h> +#include <linux/cpu.h> #include <linux/kernel.h> +#include <linux/notifier.h> #include <linux/signal.h> #include <linux/sched.h> +#include <linux/smp.h> #include <linux/init.h> #include <asm/cputype.h> @@ -484,7 +487,24 @@ void vfp_flush_hwstate(struct thread_info *thread) put_cpu(); } -#include <linux/smp.h> +/* + * VFP hardware can lose all context when a CPU goes offline. + * Safely clear our held state when a CPU has been killed, and + * re-enable access to VFP when the CPU comes back online. + * + * Both CPU_DYING and CPU_STARTING are called on the CPU which + * is being offlined/onlined. + */ +static int vfp_hotplug(struct notifier_block *b, unsigned long action, + void *hcpu) +{ + if (action == CPU_DYING || action == CPU_DYING_FROZEN) { + unsigned int cpu = (long)hcpu; + last_VFP_context[cpu] = NULL; + } else if (action == CPU_STARTING || action == CPU_STARTING_FROZEN) + vfp_enable(NULL); + return NOTIFY_OK; +} /* * VFP support code initialisation. @@ -514,6 +534,8 @@ static int __init vfp_init(void) else if (vfpsid & FPSID_NODOUBLE) { printk("no double precision support\n"); } else { + hotcpu_notifier(vfp_hotplug, 0); + smp_call_function(vfp_enable, NULL, 1); VFP_arch = (vfpsid & FPSID_ARCH_MASK) >> FPSID_ARCH_BIT; /* Extract the architecture version */ |