lkml.org 
[lkml]   [2015]   [Apr]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [patch for 4.0] x86: silence warning in /dev/mem support

* Pavel Machek <pavel@ucw.cz> wrote:

> Hi!
>
> > > CC arch/x86/mm/ioremap.o
> > > arch/x86/mm/ioremap.c: In function ‘xlate_dev_mem_ptr’:
> > > arch/x86/mm/ioremap.c:363:10: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
> > > addr = (void *)((unsigned long)addr | (phys & ~PAGE_MASK));
> > > ^
> > > LD arch/x86/mm/built-in.o
> > >
> > > pavel@amd:/data/l/linux$ gcc --version
> > > gcc (Debian 4.9.2-10) 4.9.2
> >
> > So this code has not been changed for a year or so in theory, and I've
> > never seen this warning with GCC 4.9.1. I'm wondering how it
> > triggered. Could you send me your .config that triggers this?
>
> Config sent in private email. 32-bit kernel.

Ah, I see, the key is:

CONFIG_HIGHMEM64G=y

and neither x86 defconfig nor allyesconfig/allmodconfig selects
HIGHMEM64G apparently, so this was rarely triggered.

Thanks,

Ingo


\
 
 \ /
  Last update: 2015-04-20 09:21    [W:0.098 / U:1.504 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site