Currently all fpu state access is through tsk->thread.xstate. Since we wish
to generalize fpu access to non-task contexts, wrap the state in a new
'struct fpu' and convert existing access to use an fpu API.
Signal frame handlers are not converted to the API since they will remain
task context only things.
Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
---
arch/x86/include/asm/i387.h | 115 ++++++++++++++++++++++++++++----------
arch/x86/include/asm/processor.h | 6 ++-
arch/x86/include/asm/xsave.h | 7 +-
arch/x86/kernel/i387.c | 102 +++++++++++++++++-----------------
arch/x86/kernel/process.c | 20 +++----
arch/x86/kernel/process_32.c | 2 +-
arch/x86/kernel/process_64.c | 2 +-
arch/x86/kernel/xsave.c | 2 +-
arch/x86/math-emu/fpu_aux.c | 6 +-
9 files changed, 160 insertions(+), 102 deletions(-)
diff --git a/arch/x86/include/asm/i387.h b/arch/x86/include/asm/i387.h
index 301fff5..8aae08f 100644
--- a/arch/x86/include/asm/i387.h
+++ b/arch/x86/include/asm/i387.h
@@ -16,6 +16,7 @@
#include <linux/kernel_stat.h>
#include <linux/regset.h>
#include <linux/hardirq.h>
+#include <linux/slab.h>
#include <asm/asm.h>
#include <asm/processor.h>
#include <asm/sigcontext.h>
@@ -103,10 +104,10 @@ static inline int fxrstor_checking(struct i387_fxsave_struct *fx)
values. The kernel data segment can be sometimes 0 and sometimes
new user value. Both should be ok.
Use the PDA as safe address because it should be already in L1. */
-static inline void clear_fpu_state(struct task_struct *tsk)
+static inline void fpu_clear(struct fpu *fpu)
{
- struct xsave_struct *xstate = &tsk->thread.xstate->xsave;
- struct i387_fxsave_struct *fx = &tsk->thread.xstate->fxsave;
+ struct xsave_struct *xstate = &fpu->state->xsave;
+ struct i387_fxsave_struct *fx = &fpu->state->fxsave;
/*
* xsave header may indicate the init state of the FP.
@@ -123,6 ...
