Increasing stack size to 16K on x86_64 2.6.18 kernel

alonp · 02-16-2011, 09:54 AM

Hi,

I am trying to increase the stack size of a 2.6.18 kernel x86_64 to 16K by changing:

-#define THREAD_ORDER 1
+#define THREAD_ORDER 2
#ifdef __ASSEMBLY__
#define THREAD_SIZE (1 << (PAGE_SHIFT + HREAD_ORDER))

When the system goes up all seems fine but my driver started crashing when calling vfree:

void vfree(void *addr)
{
BUG_ON(in_interrupt());
__vunmap(addr, 1);
}

Do I need to change anything else?
It seems that in_interrupt returns TRUE.

Thanks in advance,
Alon

nini09 · 02-16-2011, 02:38 PM

What's your thread context, kernel thread, software interrupt or hardware interrupt when vfree is called?

alonp · 02-16-2011, 11:39 PM

The code is running in ioctl context, the interesting thing here is the my code checks the return value of in_interrupt just before calling vfree so I won't fail calling it.

nini09 · 02-17-2011, 02:47 PM

I don't think stack size increase cause the issue. You can use kmalloc/kfree instead of vmalloc/vfree.