On Thu, 10 Jan 2008, Pallipadi, Venkatesh wrote: > > Yes. I had those pages not mapped at all earlier. The reason I switched > to zero page is to continue support cases like: > BIOS-e820: 0000000000000000 - 000000000009cc00 (usable) > BIOS-e820: 000000000009cc00 - 00000000000a0000 (reserved) > BIOS-e820: 00000000000cc000 - 00000000000d0000 (reserved) > BIOS-e820: 00000000000e4000 - 0000000000100000 (reserved) > BIOS-e820: 0000000000100000 - 00000000cff60000 (usable) > > In this case if some one does a dd of /dev/mem before they can read the > contents of usable memory in 0x100000-0xcff60000 range.
Well, I think that /dev/mem should simply give them the right info. That's what people use /dev/mem for - doing things like reading BIOS images etc. So returning *either* a zero page *or* stopping at the first hole is both equally wrong. Linus -- 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/