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 --- include/asm-x86/thread_info.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'include/asm-x86/thread_info.h') diff --git a/include/asm-x86/thread_info.h b/include/asm-x86/thread_info.h index d5fd12f2abdb..407b88c170d3 100644 --- a/include/asm-x86/thread_info.h +++ b/include/asm-x86/thread_info.h @@ -1,5 +1,13 @@ +#ifndef _ASM_X86_THREAD_INFO_H #ifdef CONFIG_X86_32 # include "thread_info_32.h" #else # include "thread_info_64.h" #endif + +#ifndef __ASSEMBLY__ +extern void arch_task_cache_init(void); +extern void free_thread_info(struct thread_info *ti); +extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src); +#endif +#endif /* _ASM_X86_THREAD_INFO_H */ -- cgit v1.2.3