From 61c4628b538608c1a85211ed8438136adfeb9a95 Mon Sep 17 00:00:00 2001 From: Suresh Siddha Date: Mon, 10 Mar 2008 15:28:04 -0700 Subject: 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 Signed-off-by: Arjan van de Ven Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- arch/x86/kernel/traps_64.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'arch/x86/kernel/traps_64.c') diff --git a/arch/x86/kernel/traps_64.c b/arch/x86/kernel/traps_64.c index 6d883b13ef4..dc0cb497eec 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++; } @@ -1163,6 +1163,10 @@ void __init trap_init(void) set_system_gate(IA32_SYSCALL_VECTOR, ia32_syscall); #endif + /* + * initialize the per thread extended state: + */ + init_thread_xstate(); /* * Should be a barrier for any external CPU state. */ -- cgit v1.2.3