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authorSuresh Siddha <suresh.b.siddha@intel.com>2008-03-10 15:28:04 -0700
committerIngo Molnar <mingo@elte.hu>2008-04-19 19:19:55 +0200
commit61c4628b538608c1a85211ed8438136adfeb9a95 (patch)
tree290a695299a363153bc692e6d705ac680d64359e /arch/x86/math-emu/fpu_entry.c
parentfa5c4639419668cbb18ca3d20c1253559a3b43ae (diff)
x86, fpu: split FPU state from task struct - v5
Split the FPU save area from the task struct. This allows easy migration of FPU context, and it's generally cleaner. It also allows the following two optimizations: 1) only allocate when the application actually uses FPU, so in the first lazy FPU trap. This could save memory for non-fpu using apps. Next patch does this lazy allocation. 2) allocate the right size for the actual cpu rather than 512 bytes always. Patches enabling xsave/xrstor support (coming shortly) will take advantage of this. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/math-emu/fpu_entry.c')
-rw-r--r--arch/x86/math-emu/fpu_entry.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/math-emu/fpu_entry.c b/arch/x86/math-emu/fpu_entry.c
index 4bab3b145392..6e38d877ea77 100644
--- a/arch/x86/math-emu/fpu_entry.c
+++ b/arch/x86/math-emu/fpu_entry.c
@@ -678,7 +678,7 @@ int fpregs_soft_set(struct task_struct *target,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
- struct i387_soft_struct *s387 = &target->thread.i387.soft;
+ struct i387_soft_struct *s387 = &target->thread.xstate->soft;
void *space = s387->st_space;
int ret;
int offset, other, i, tags, regnr, tag, newtop;
@@ -730,7 +730,7 @@ int fpregs_soft_get(struct task_struct *target,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
- struct i387_soft_struct *s387 = &target->thread.i387.soft;
+ struct i387_soft_struct *s387 = &target->thread.xstate->soft;
const void *space = s387->st_space;
int ret;
int offset = (S387->ftop & 7) * 10, other = 80 - offset;