Howdy.

On systems with lots of processors (512 for example), catting /proc/interrupts
fails with a "not enough memory" error.

This was observed in 2.6.0-test8

I tracked this down to this in proc_misc.c:

static int interrupts_open(struct inode *inode, struct file *file)
{
   unsigned size = 4096 * (1 + num_online_cpus() / 8);
   char *buf = kmalloc(size, GFP_KERNEL);

The kmalloc fails here.

I'm looking for suggestions on how to fix this.  I came up with one fix
that seems to work OK for ia64.  I have attached it to this message.
I'm looking for advice on what should be proposed for the real fix.

Thanks!

--
Erik Jacobson - Linux System Software - Silicon Graphics - Eagan, Minnesota