Re: [PATCH] Use MM_VM_SIZE in exit_mmap

[Ian Molton]

Anton Blanchard wrote:

> As an aside, all architectures except one define FIRST_USER_PGD_NR as 0:
>
> include/asm-arm26/pgtable.h:#define FIRST_USER_PGD_NR       1

All processes on arm26 must map the same page 0 as its where the SWI 
vector table goes. The vector table is located at address 0, and as such 
becomes virtual address space once the MMU is switched on. This is 
unavoidable, unlike later ARMs which can remap it elsewhere.

The only way this could work is if you do the zeroing with all 
interrupts off and restore page 0 afterwards, which seems rather silly 
to me.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/