diff options
| author | Suresh Siddha <suresh.b.siddha@intel.com> | 2008-03-10 15:28:04 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-04-19 19:19:55 +0200 |
| commit | 61c4628b538608c1a85211ed8438136adfeb9a95 (patch) | |
| tree | 290a695299a363153bc692e6d705ac680d64359e /arch/x86/kernel/traps_64.c | |
| parent | fa5c4639419668cbb18ca3d20c1253559a3b43ae (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/kernel/traps_64.c')
| -rw-r--r-- | arch/x86/kernel/traps_64.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/x86/kernel/traps_64.c b/arch/x86/kernel/traps_64.c index 6d883b13ef4f..dc0cb497eec3 100644 --- a/arch/x86/kernel/traps_64.c +++ b/arch/x86/kernel/traps_64.c @@ -1128,7 +1128,7 @@ asmlinkage void math_state_restore(void) if (!used_math()) init_fpu(me); - restore_fpu_checking(&me->thread.i387.fxsave); + restore_fpu_checking(&me->thread.xstate->fxsave); task_thread_info(me)->status |= TS_USEDFPU; me->fpu_counter++; } @@ -1164,6 +1164,10 @@ void __init trap_init(void) #endif /* + * initialize the per thread extended state: + */ + init_thread_xstate(); + /* * Should be a barrier for any external CPU state. */ cpu_init(); |