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

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Message-ID: <CAK8P3a1JCnSPi+D+CozhqL0dS9WwXtONDHp4=Kg5kCHrpdYwrw@mail.gmail.com>
Date:   Thu, 6 Sep 2018 17:28:24 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Firoz Khan <firoz.khan@...aro.org>
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 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,

> -/* 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.

> -#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