lkml.org 
[lkml]   [2012]   [May]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH 08/10] Use __kernel_ulong_t in struct msqid64_ds
Date
On Friday 18 May 2012, H.J. Lu wrote:
> Since x32 uses the same kernel interface as x86-64 with a few
> exceptions. The current kernel header files with
>
> #ifdef __x86_64__
> # define __BITS_PER_LONG 64
> #else
> # define __BITS_PER_LONG 32
> #endif
>
> #if __BITS_PER_LONG == 64
> Define x86-64 types
> #endif
>
> work fine for x32 even if long for x32 is 32 bits. If __BITS_PER_LONG
> is changed to 32 for x32, many types in kernel header files will be
> wrong for x32.
>

A lot of things are broken if __BITS_PER_LONG is set to 64 in x32 user
space. It was specifically introduced to get around places in exported
headers that incorrectly used '#ifdef CONFIG_64BIT' to define a user
space structure, so that we can depend on whatever the user sees
in bitmasks and other data structures.

Arnd


\
 
 \ /
  Last update: 2012-05-18 23:41    [W:0.255 / U:0.980 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site