rename some functions with a 'k' prefix to please codegraph
put globals as static, help codegraph too to avoid duplicated nodes
* pad.org: misc
* mm/kalloc.c:
* programs/Makefile: disable forktest, pb with printf
* Makefile.config: rev7 comment
* Makefile: update to recent changes in gcc, need -j to compress bootsector
* Makefile.config: try on linux, cross compiler on macos do not work
very well
Merge branch 'master' of github.com:aryx/fork-xv6