linux-kernel - Re: set_thread_area.2: csky architecture undocumented

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Date:   Thu, 26 Nov 2020 13:14:12 +0100
From:   "Alejandro Colomar (mailing lists; readonly)" 
        <alx.mailinglists@...il.com>
To:     "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
        "Alejandro Colomar (man-pages)" <alx.manpages@...il.com>
Cc:     linux-man <linux-man@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Guo Ren <guoren@...nel.org>, linux-csky@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: set_thread_area.2: csky architecture undocumented

HI Michael,

On 11/24/20 10:51 AM, Michael Kerrisk (man-pages) wrote:
> Hi Alex,
> 
> On 11/23/20 10:31 PM, Alejandro Colomar (man-pages) wrote:
>> Hi Michael,
>>
>> SYNOPSIS
>>        #include <linux/unistd.h>
>>
>>        #if defined __i386__ || defined __x86_64__
>>        # include <asm/ldt.h>
>>
>>        int get_thread_area(struct user_desc *u_info);
>>        int set_thread_area(struct user_desc *u_info);
>>
>>        #elif defined __m68k__
>>
>>        int get_thread_area(void);
>>        int set_thread_area(unsigned long tp);
>>
>>        #elif defined __mips__
>>
>>        int set_thread_area(unsigned long addr);
>>
>>        #endif
>>
>>        Note: There are no glibc wrappers for these system  calls;  see
>>        NOTES.
>>
>>
>> $ grep -rn 'SYSCALL_DEFINE.*et_thread_area'
>> arch/csky/kernel/syscall.c:6:
>> SYSCALL_DEFINE1(set_thread_area, unsigned long, addr)
>> arch/mips/kernel/syscall.c:86:
>> SYSCALL_DEFINE1(set_thread_area, unsigned long, addr)
>> arch/x86/kernel/tls.c:191:
>> SYSCALL_DEFINE1(set_thread_area, struct user_desc __user *, u_info)
>> arch/x86/kernel/tls.c:243:
>> SYSCALL_DEFINE1(get_thread_area, struct user_desc __user *, u_info)
>> arch/x86/um/tls_32.c:277:
>> SYSCALL_DEFINE1(set_thread_area, struct user_desc __user *, user_desc)
>> arch/x86/um/tls_32.c:325:
>> SYSCALL_DEFINE1(get_thread_area, struct user_desc __user *, user_desc)
>>
>>
>> See kernel commit 4859bfca11c7d63d55175bcd85a75d6cee4b7184
>>
>>
>> I'd change
>> -      #elif defined __mips__
>> +      #elif defined(__mips__ || __csky__)
>>
>> and then change the rest of the text to add csky when appropriate.
>> Am I correct?
> 
> AFAICT, you are correct. I think the reason that csky is missing is
> that the architecture was added after this manual pages was added.

Yep, I guessed it was that :)

Thanks,

Alex

> 
> Thanks,
> 
> Michael
> 
>