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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 /include/asm-x86/thread_info.h
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 'include/asm-x86/thread_info.h')
-rw-r--r--include/asm-x86/thread_info.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/asm-x86/thread_info.h b/include/asm-x86/thread_info.h
index d5fd12f2abd..407b88c170d 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 */