On Wed, Nov 21, 2012 at 11:56 AM, H. Peter Anvin <hpa at zytor.com> wrote: > On 11/21/2012 11:54 AM, Yinghai Lu wrote: >> >> in kernel arch/x86/kernel/head_64.S >> >> it only set first 1G ident mapping. and if it find that code is above >> 1G, it will set extra ident mapping >> for new _text.._end. >> To make checking and add extra mapping simple and also save two extra >> pages for mapping. >> Limit that _text.._end in them same GB range. >> > > No, this is backwards. old one: it limited bzImage in [0,1G) aka the first 1G. Now we can put it in any aligned 1G range. So how could it be called backwards? > > We should fix that limitation instead. sure, but that will make arch/x86/boot/compressed/head_64.S not need complicated.
