Hi.. On 12/14/09, Pulkit Goel <vipulkit.goel@xxxxxxxxx> wrote: > *Hi all,* > > Actually I have the same problem, > > Whenever I compile Old Kernel on a new Kernel system Then its always gives > error in compilation > When i troubleshoot then i found that* "gcc compiler version mismatches"* & > we are unable to downgrade the* gcc.* > so My Question is that. > > Q) There is no way to install old kernel on a new system or to downgarde the > kernel ?? To the best that I know, actually you can install old kernel on new system. It just depends whether your distro includes old gcc or not. Like I previously describe, once in redhat 9 or fedora core 2 (i forgot which one), there is a package called egcs. This is actually an older gcc version at that day (maybe 3.1 or 3.2, while by default it uses 3.4..I might be wrong though). However....... the best result..of course, is achieved when kernel and user space are compiled with the same gcc version. I'm not talking about using different gcc version will make one side degrades over the other, but it's about making sure ABI is working as expected. Different gcc version, AFAIK, could create different way on doing something. For example (hopefully I explain it correctly, crossing my finger) take vsyscall page. It is effectively use if gcc creates binaries that do jump to that page's address. Well, jumping to vsyscall is not a must since you can still do int 80 and putting syscall number in EAX though, but via vsyscall, kernel can decide to instead use faster SYSCALL/SYSENTER. -- regards, Mulyadi Santosa Freelance Linux trainer and consultant blog: the-hydra.blogspot.com training: mulyaditraining.blogspot.com -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
