On Tue, Jan 25, 2005 at 11:02:10PM +0000, Ian Molton wrote: > 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
I don't think Anton can count. (and for some reason I seem to be missing his mail at the moment.) include/asm-arm/pgtable.h:#define FIRST_USER_PGD_NR 1 there's two. FIRST_USER_PGD_NR was created specifically for ARM because many of our CPUs place their hardware vector tables at *virtual* address zero. Unmapping this virtual page would be rather bad for the system - consider the effect of unmapping the code for *all* CPU exceptions. -- Russell King Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/ maintainer of: 2.6 PCMCIA - http://pcmcia.arm.linux.org.uk/ 2.6 Serial core - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
