lkml.org 
[lkml]   [2000]   [Sep]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: how interesting are data->bss patches?
Date
On Sun, 24 Sep 2000 08:31:12 -0500 (CDT), 
Jeff Garzik <jgarzik@mandrakesoft.mandrakesoft.com> wrote:
>> On Sat, 23 Sep 2000 20:59:59 -0500 (CDT),
>> Peter Samuelson <peter@cadcamlab.org> wrote:
>> >(A related question: __initdata *does* have to be initialized, right?)
>>
>> If __initdata is not initialized then it ends up in the global .bss.
>> This would defeat the purpose of using __initdata.
>
>I am glad this was mentioned... It is a valid use of __initdata for
>static variables which you want to go away after boot. There might be
>some wasted space lurking here and there due to un-init'd __initdata
>vars.

Another case to look at. I discovered that

char __initdata *cmd[] = {
"command1",
"command2",
"command3",
NULL
};

Stores the 4 pointers of cmd in .init.data but the strings are down in
.rodata, i.e. they are not discarded after init. I got around it by

static __initdata char str_command1[] = "command1";
static __initdata char str_command2[] = "command2";
static __initdata char str_command3[] = "command3";
char __initdata *cmd[] = {
str_command1,
str_command2,
str_command3,
NULL
};

That put the strings in .init.data as well as the array. This simpler
version might work but I have not tried it.

char __initdata *cmd[] = {
__initdata "command1",
__initdata "command2",
__initdata "command3",
NULL
};

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 12:38    [W:0.061 / U:4.604 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site