lkml.org 
[lkml]   [2017]   [Jan]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] prctl: implement PR_GET_ENDIAN for all architectures
On Sat, 28 Jan 2017 12:13:10 +0100 Helge Deller <deller@gmx.de> wrote:

> The prctl(PR_GET_ENDIAN) syscall was added to Kernel 2.6.18, but
> implemented for PowerPC only.
> This trivial patch adds support for this syscall for all other architectures.

Seems reasonable. I guess. Why is this needed?

The man page will need updating. It says "PowerPC only".

>
> diff --git a/kernel/sys.c b/kernel/sys.c
> index 842914e..5818e5e 100644
> --- a/kernel/sys.c
> +++ b/kernel/sys.c
> @@ -79,9 +79,6 @@
> #ifndef GET_FPEXC_CTL
> # define GET_FPEXC_CTL(a, b) (-EINVAL)
> #endif
> -#ifndef GET_ENDIAN
> -# define GET_ENDIAN(a, b) (-EINVAL)
> -#endif
> #ifndef SET_ENDIAN
> # define SET_ENDIAN(a, b) (-EINVAL)
> #endif
> @@ -2136,7 +2133,13 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
> return -EFAULT;
> break;
> case PR_GET_ENDIAN:
> +#ifdef GET_ENDIAN
> error = GET_ENDIAN(me, arg2);
> +#elif defined(__BIG_ENDIAN)
> + error = put_user(PR_ENDIAN_BIG, (unsigned int __user *)arg2);
> +#else
> + error = put_user(PR_ENDIAN_LITTLE, (unsigned int __user *)arg2);
> +#endif
> break;
> case PR_SET_ENDIAN:
> error = SET_ENDIAN(me, arg2);

\
 
 \ /
  Last update: 2017-02-01 01:26    [W:0.076 / U:0.472 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site