linux-kernel - Re: [PATCH 1/4] sparc: Move __IGNORE* entries to non uapi header

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Date:   Tue, 18 Sep 2018 17:23:07 +0530
From:   Firoz Khan <firoz.khan@...aro.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     David Miller <davem@...emloft.net>,
        sparclinux <sparclinux@...r.kernel.org>,
        gregkh <gregkh@...uxfoundation.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        y2038 Mailman List <y2038@...ts.linaro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Deepa Dinamani <deepa.kernel@...il.com>,
        Marcin Juszkiewicz <marcin.juszkiewicz@...aro.org>
Subject: Re: [PATCH 1/4] sparc: Move __IGNORE* entries to non uapi header

On 6 September 2018 at 20:58, Arnd Bergmann <arnd@...db.de> wrote:
> On Tue, Sep 4, 2018 at 6:42 AM Firoz Khan <firoz.khan@...aro.org> wrote:
>
>> +++ b/arch/sparc/include/uapi/asm/unistd.h
>> @@ -15,12 +15,6 @@
>>  #ifndef _UAPI_SPARC_UNISTD_H
>>  #define _UAPI_SPARC_UNISTD_H
>>
>> -#ifndef __32bit_syscall_numbers__
>> -#ifndef __arch64__
>> -#define __32bit_syscall_numbers__
>> -#endif
>> -#endif
>
> This is certainly required in the uapi header as of this patch,
> without it all the numbers are wrong when you include the
> file from user space.
>
> I suppose it can be removed later once the header is replaced
> with the two generated versions,

The script will generate 2 versions, ie, unistd_32.h and unistd_64.h.
Please give few more pointer here.

>
>> -/* Bitmask values returned from kern_features system call.  */
>> -#define KERN_FEATURE_MIXED_MODE_STACK  0x00000001
>
> I'm fairly sure this also needs to remain in the uapi/asm/unistd.h header
> as a start, so that user space can call the sys_kern_features() system
> call and interpret its result when only the first patch is applied.

Sure. I'll update in the next patch series. Thanks!

>
>> -#ifdef __32bit_syscall_numbers__
>> -/* Sparc 32-bit only has the "setresuid32", "getresuid32" variants,
>> - * it never had the plain ones and there is no value to adding those
>> - * old versions into the syscall table.
>> - */
>> -#define __IGNORE_setresuid
>> -#define __IGNORE_getresuid
>> -#define __IGNORE_setresgid
>> -#define __IGNORE_getresgid
>> -#endif
>> -
>> -/* Sparc doesn't have protection keys. */
>> -#define __IGNORE_pkey_mprotect
>> -#define __IGNORE_pkey_alloc
>> -#define __IGNORE_pkey_free
>> -
>
> This part is fine.
>
>       Arnd