diff options
Diffstat (limited to 'arch/s390/kernel/process.c')
| -rw-r--r-- | arch/s390/kernel/process.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c index 4e3b366589fb..7227a73226f1 100644 --- a/arch/s390/kernel/process.c +++ b/arch/s390/kernel/process.c @@ -31,15 +31,18 @@ #include <linux/init_task.h> #include <linux/entry-common.h> #include <linux/io.h> +#include <asm/guarded_storage.h> +#include <asm/access-regs.h> +#include <asm/switch_to.h> #include <asm/cpu_mf.h> #include <asm/processor.h> +#include <asm/ptrace.h> #include <asm/vtimer.h> #include <asm/exec.h> #include <asm/irq.h> #include <asm/nmi.h> #include <asm/smp.h> #include <asm/stacktrace.h> -#include <asm/switch_to.h> #include <asm/runtime_instr.h> #include <asm/unwind.h> #include "entry.h" @@ -190,6 +193,24 @@ void execve_tail(void) asm volatile("sfpc %0" : : "d" (0)); } +struct task_struct *__switch_to(struct task_struct *prev, struct task_struct *next) +{ + /* + * save_fpu_regs() sets the CIF_FPU flag, which enforces + * a restore of the floating point / vector registers as + * soon as the next task returns to user space. + */ + save_fpu_regs(); + save_access_regs(&prev->thread.acrs[0]); + save_ri_cb(prev->thread.ri_cb); + save_gs_cb(prev->thread.gs_cb); + update_cr_regs(next); + restore_access_regs(&next->thread.acrs[0]); + restore_ri_cb(next->thread.ri_cb, prev->thread.ri_cb); + restore_gs_cb(next->thread.gs_cb); + return __switch_to_asm(prev, next); +} + unsigned long __get_wchan(struct task_struct *p) { struct unwind_state state; |