lkml.org 
[lkml]   [2012]   [Apr]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH v15 04/13] arch/x86: add syscall_get_arch to syscall.h
From
On Sun, Mar 25, 2012 at 2:34 PM, H. Peter Anvin <hpa@zytor.com> wrote:
> On 03/14/2012 08:11 PM, Will Drewry wrote:
>>
>> +static inline int syscall_get_arch(struct task_struct *task,
>> +                                struct pt_regs *regs)
>> +{
>> +#ifdef CONFIG_IA32_EMULATION
>> +     /*
>> +      * TS_COMPAT is set for 32-bit syscall entries and then
>> +      * remains set until we return to user mode.
>> +      *
>> +      * TIF_IA32 tasks should always have TS_COMPAT set at
>> +      * system call time.
>> +      */
>> +     if (task_thread_info(task)->status & TS_COMPAT)
>> +             return AUDIT_ARCH_I386;
>> +#endif
>> +     return AUDIT_ARCH_X86_64;
>> +}
>>  #endif       /* CONFIG_X86_32 */
>>
>>  #endif       /* _ASM_X86_SYSCALL_H */
>
> Just one FYI on this: after the x32 changes are upstream this can be
> implemented in terms of is_ia32_task().

Now that I've seen is_ia32_task(), it appears to be exactly the same as above:
(1) If we're x86_32, it's ia32
(2) If we're x86_64, ia32 == !!(status & TS_COMPAT)
(3) Otherwise, it's x86_64, including x32

Am I missing something? Should is_ia32_task(void) take a task_struct?
Right now, I don't see any reason to change the code, as posted, but
maybe I am mis-reading?

thanks!
will
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2012-04-11 05:17    [W:0.052 / U:15.988 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site