Re: array size limit in module?

[Brian Gerst <bgerst@didntduck.org>]

Fernando Jimenez wrote:
> 
> Hi
> 
> I am trying to code a simple kernel module and I have found a problem I don't
> quite understand.
> 
> Here is the offending part of code:
> 
> char *sectors_array = NULL;
> ........
> secs_size=131072;
> sectors_array = kmalloc(secs_size*sizeof(char), GFP_KERNEL);
> for(i=0; i<secs_size; i++) {
>         sectors_array[i]=0;
> }
> 
> This bit of code, as it is, works fine. However, if I increment secs_size by
> one, ie, I do 'secs_size=131073;' instead of 131072, I get the following:

Use vmalloc for allocations that large, unless you must have the memory
physically contiguous.  128k is the largest amount of memory you can
allocate with kmalloc.

--

				Brian Gerst