diff options
| author | Heiko Carstens <hca@linux.ibm.com> | 2024-02-03 11:45:12 +0100 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2024-02-16 14:30:15 +0100 |
| commit | 4eed43de9ba0ae3af6716544408d185a152424cd (patch) | |
| tree | ee2921767b33f83258559e00906400ca8b7ce84b /arch/s390/kernel/process.c | |
| parent | c038b984a9af1010555986d6fe32d4da9db9fc3d (diff) | |
s390/fpu: make kernel fpu context preemptible
Make the kernel fpu context preemptible. Add another fpu structure to the
thread_struct, and use it to save and restore the kernel fpu context if its
task uses fpu registers when it is preempted.
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'arch/s390/kernel/process.c')
| -rw-r--r-- | arch/s390/kernel/process.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c index 62146daf9051..b7b623818753 100644 --- a/arch/s390/kernel/process.c +++ b/arch/s390/kernel/process.c @@ -95,6 +95,7 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) *dst = *src; dst->thread.ufpu.regs = dst->thread.ufpu.fprs; + dst->thread.kfpu_flags = 0; /* * Don't transfer over the runtime instrumentation or the guarded @@ -197,10 +198,12 @@ void execve_tail(void) struct task_struct *__switch_to(struct task_struct *prev, struct task_struct *next) { save_user_fpu_regs(); + save_kernel_fpu_regs(&prev->thread); 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_kernel_fpu_regs(&next->thread); 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); |