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[PATCH] x86_64: Implement is_compat_task the right way

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By setting a flag during a 32bit system call only

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andi Kleen 2006-01-11 22:44:06 +01:00 • committed by Linus Torvalds
parent 2966387b48
commit bf2fcc6fdf
6 changed files with 16 additions and 1 deletions
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5
include/asm-x86_64/compat.h
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@ -202,4 +202,9 @@ static __inline__ void __user *compat_alloc_user_space(long len)
return (void __user *)regs->rsp - len;
}
static inline int is_compat_task(void)
{
return current_thread_info()->status & TS_COMPAT;
}
#endif /* _ASM_X86_64_COMPAT_H */

1
include/asm-x86_64/thread_info.h
View file

@ -138,6 +138,7 @@ static inline struct thread_info *stack_thread_info(void)
* have to worry about atomic accesses.
*/
#define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */
#define TS_COMPAT 0x0002 /* 32bit syscall active */
#endif /* __KERNEL__ */